1
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Siddiqui AR, N'Diaye J, Santiago-Carboney A, Martin K, Bhargava R, Rodríguez-López J. Spectroelectrochemical determination of thiolate self-assembled monolayer adsorptive stability in aqueous and non-aqueous electrolytes. Analyst 2024; 149:2842-2854. [PMID: 38600773 DOI: 10.1039/d4an00241e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Self-assembled monolayers (SAM) are ubiquitous in studies of modified electrodes for sensing, electrocatalysis, and environmental and energy applications. However, determining their adsorptive stability is crucial to ensure robust experiments. In this work, the stable potential window (SPW) in which a SAM-covered electrode can function without inducing SAM desorption was determined for aromatic SAMs on gold electrodes in aqueous and non-aqueous solvents. The SPWs were determined by employing cyclic voltammetry, attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), and surface plasmon resonance (SPR). The electrochemical and spectroscopic findings concluded that all the aromatic SAMs used displayed similar trends and SPWs. In aqueous systems, the SPW lies between the reductive desorption and oxidative desorption, with pH being the decisive factor affecting the range of the SPW, with the widest SPW observed at pH 1. In the non-aqueous electrolytes, the desorption of SAMs was observed to be slow and progressive. The polarity of the solvent was the main factor in determining the SPW. The lower the polarity of the solvent, the larger the SPW, with 1-butanol displaying the widest SPW. This work showcases the power of spectroelectrochemical analysis and provides ample future directions for the use of non-polar solvents to increase SAM stability in electrochemical applications.
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Affiliation(s)
- Abdur-Rahman Siddiqui
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA.
| | - Jeanne N'Diaye
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA.
- The Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA
| | | | - Kristin Martin
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA.
| | - Rohit Bhargava
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA.
- The Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA
- Department of Bioengineering and Cancer Center at Illinois, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA
| | - Joaquín Rodríguez-López
- Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA.
- The Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois, 61801, USA
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2
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Chen X, Dhirani AA. Thin Film Resistance Gating by Redox Charge Exchange: Evidence for a Quantum Transition State. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38710102 DOI: 10.1021/acsami.4c02058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Field effect transistors (FETs) and related devices have enabled tremendous advances in electronics, as well as studies of fundamental phenomena. FETs are classically actuated as fields charge/discharge materials, thereby modifying their resistance. Here, we develop charge exchange transistors (CETs) that comprise thin films whose resistance is modified by quantum charge exchange processes, e.g., redox and bonding. We first use CETs to probe the metallocene-thin film interaction during cyclic voltammetry. Remarkably, CETs reveal transient resistance peaks associated with charge transfer during both oxidation and reduction. Our data combined with kinetics and density functional theory modeling are consistent with a multistep redox pathway, including the formation/destruction of a quantum transition state that overlaps molecule + thin film band states. As a further proof-of-principle demonstration, we also use CETs to monitor n-alkanethiol self-assembly on thin Au films in real-time. CETs exhibit monotonic resistance increase consistent with previously reported fast-then-slow kinetics attributed to thiol-thin film bond formation (charge localization) and etching and/or molecule reorganization.
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Affiliation(s)
- Xiaoyang Chen
- Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
| | - Al-Amin Dhirani
- Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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3
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Gutheil C, Roß G, Amirjalayer S, Mo B, Schäfer AH, Doltsinis NL, Braunschweig B, Glorius F. Tailored Monolayers of N-Heterocyclic Carbenes by Kinetic Control. ACS NANO 2024; 18:3043-3052. [PMID: 38252154 DOI: 10.1021/acsnano.3c08045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Despite the substantial success of N-heterocyclic carbenes (NHCs) as stable and versatile surface modification ligands, their use in nanoscale applications beyond chemistry is still hampered by the failure to control the carbene binding mode, which complicates the fabrication of monolayers with the desired physicochemical properties. Here, we applied vibrational sum-frequency generation spectroscopy to conduct a pseudokinetic surface analysis of NHC monolayers on Au thin films under ambient conditions. We observe for two frequently used carbene structures that their binding mode is highly dynamic and changes with the adsorption time. In addition, we demonstrate that this transition can be accelerated or decelerated to adjust the binding mode of NHCs, which allows fabrication of tailored monolayers of NHCs simply by kinetic control.
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Affiliation(s)
- Christian Gutheil
- Organisch-Chemisches Institut, University of Münster, Corrensstraße 36, 48149 Münster, Germany
| | - Gina Roß
- Institut für Physikalische Chemie, University of Münster, Corrensstraße 28/30, 48149 Münster, Germany
| | - Saeed Amirjalayer
- Institut für Festkörpertheorie and Center for Multiscale Theory and Computation, University of Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Boris Mo
- Institut für Pharmazeutische Biologie und Phytochemie, University of Münster, Corrensstraße 48, 48149 Münster, Germany
| | | | - Nikos L Doltsinis
- Institut für Festkörpertheorie and Center for Multiscale Theory and Computation, University of Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Björn Braunschweig
- Institut für Physikalische Chemie, University of Münster, Corrensstraße 28/30, 48149 Münster, Germany
| | - Frank Glorius
- Organisch-Chemisches Institut, University of Münster, Corrensstraße 36, 48149 Münster, Germany
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4
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Wang J, Gadenne V, Patrone L, Raimundo JM. Self-Assembled Monolayers of Push-Pull Chromophores as Active Layers and Their Applications. Molecules 2024; 29:559. [PMID: 38338304 PMCID: PMC10856137 DOI: 10.3390/molecules29030559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 02/12/2024] Open
Abstract
In recent decades, considerable attention has been focused on the design and development of surfaces with defined or tunable properties for a wide range of applications and fields. To this end, self-assembled monolayers (SAMs) of organic compounds offer a unique and straightforward route of modifying and engineering the surface properties of any substrate. Thus, alkane-based self-assembled monolayers constitute one of the most extensively studied organic thin-film nanomaterials, which have found wide applications in antifouling surfaces, the control of wettability or cell adhesion, sensors, optical devices, corrosion protection, and organic electronics, among many other applications, some of which have led to their technological transfer to industry. Nevertheless, recently, aromatic-based SAMs have gained importance as functional components, particularly in molecular electronics, bioelectronics, sensors, etc., due to their intrinsic electrical conductivity and optical properties, opening up new perspectives in these fields. However, some key issues affecting device performance still need to be resolved to ensure their full use and access to novel functionalities such as memory, sensors, or active layers in optoelectronic devices. In this context, we will present herein recent advances in π-conjugated systems-based self-assembled monolayers (e.g., push-pull chromophores) as active layers and their applications.
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Affiliation(s)
- Junlong Wang
- Aix Marseille Univ, CNRS, CINaM, AMUTech, 13288 Marseille, France;
- ISEN, Université de Toulon, Aix Marseille Univ, CNRS, IM2NP, AMUtech, 83041 Toulon ou Marseille, France;
| | - Virginie Gadenne
- ISEN, Université de Toulon, Aix Marseille Univ, CNRS, IM2NP, AMUtech, 83041 Toulon ou Marseille, France;
| | - Lionel Patrone
- ISEN, Université de Toulon, Aix Marseille Univ, CNRS, IM2NP, AMUtech, 83041 Toulon ou Marseille, France;
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5
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Hoang J, Patil SL, Srinoi P, Liu T, Marquez MD, Khantamat O, Tuntiwechapikul W, Gunaratne PH, Lee TR. Transfection of Unmodified MicroRNA Using Monolayer-Coated Au Nanoparticles as Gene-Delivery Vehicles. ACS APPLIED BIO MATERIALS 2024; 7:230-237. [PMID: 38133569 DOI: 10.1021/acsabm.3c00837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
This article describes a monolayer-coated gold nanoparticle-based transfection system for the delivery of microRNA (miRNA) into human osteosarcoma (HOS) cells. Two distinct ammonium-terminated adsorbates were used in this study, which provided a platform for ionic bonding of the miRNA onto gold nanoparticles (AuNPs). The custom-designed monolayer-coated gold nanoparticles were characterized by dynamic light scattering, gel mobility shift assay, transmission electron microscopy, ultraviolet-visible spectrometry, zeta potential, and X-ray photoelectron spectroscopy. The miRNA-loaded gold nanoparticles were transfected, and the level of intracellular miRNA delivered and taken up by cells was measured by Taqman qPCR. The overall analysis indicated a successful delivery of miRNA into the HOS cells at an ∼11,000-fold increase compared to nontreated cells.
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Affiliation(s)
- Johnson Hoang
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, United States
| | - Sagar L Patil
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, United States
- St. Jude Children's Research Hospital, Memphis, Tennessee 38105, United States
| | - Pannaree Srinoi
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
- Department of Chemistry and Centre of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Tingting Liu
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
| | - Maria D Marquez
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
| | - Orawan Khantamat
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wirote Tuntiwechapikul
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Preethi H Gunaratne
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, United States
| | - T Randall Lee
- Departments of Chemistry and Chemical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5003, United States
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6
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Khurana R, Alami F, Nijhuis CA, Keinan E, Huskens J, Reany O. Selective Perchlorate Sensing Using Electrochemical Impedance Spectroscopy with Self-Assembled Monolayers of semiaza-Bambusurils. Chemistry 2024; 30:e202302968. [PMID: 37870886 DOI: 10.1002/chem.202302968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/21/2023] [Accepted: 10/23/2023] [Indexed: 10/24/2023]
Abstract
In the last two decades, perchlorate salts have been identified as environmental pollutants and recognized as potential substances affecting human health. We describe self-assembled monolayers (SAMs) of novel semiaza-bambus[6]urils (semiaza-BUs) equipped with thioethers or disulfide (dithiolane) functionalities as surface-anchoring groups on gold electrodes. Cyclic voltammetry (CV) with Fe(CN)6 3-/4- as a redox probe, together with X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and ellipsometry, were employed to characterize the interactions at the interface between the anchoring groups and the metal substrate. Data showed that the anion receptors' packing on the gold strongly depends on the anchoring group. As a result, SAMs of BUs with lipoic amide side chains show a concentration-dependent layer thickness. The BU SAMs are extremely stable on repeated electrochemical potential scans and can selectively recognize perchlorate anions. Our electrochemical impedance spectroscopy (EIS) studies indicated that semiaza-BU equipped with the lipoic amide side chains binds perchlorate (2-100 mM) preferentially over other anions such as F- , Cl- , I- , AcO- , H2 PO4 - , HPO4 2- , SO4 2- , NO2 - , NO3 - , or CO3 2- . The resistance performance is 10 to 100 times more efficient than SAMs containing all other tested anions.
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Affiliation(s)
- Raman Khurana
- Department of Natural Sciences, The Open University of Israel, 1 University Road, Ra'anana, 4353701, Israel
| | - Fuad Alami
- Hybrid Materials for Opto-Electronics Group, MESA+ Institute, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Christian A Nijhuis
- Hybrid Materials for Opto-Electronics Group, MESA+ Institute, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Ehud Keinan
- Faculty of Chemistry, Technion-Israel Institute of Technology, Technion, Haifa, Israel
| | - Jurriaan Huskens
- Molecular Nanofabrication Group, MESA+ Institute, Faculty of Science and Technology, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Ofer Reany
- Department of Natural Sciences, The Open University of Israel, 1 University Road, Ra'anana, 4353701, Israel
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7
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Chou YW, Chang SY, Keng PY. Thermal Stability and Orthogonal Functionalization of Organophosphonate Self-Assembled Monolayers as Potential Liners for Cu Interconnect. ACS OMEGA 2023; 8:39699-39708. [PMID: 37901487 PMCID: PMC10601072 DOI: 10.1021/acsomega.3c05629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/29/2023] [Indexed: 10/31/2023]
Abstract
In this study, we investigated the thermal stabilities of butylphosphonic acid (BPA) and aminopropyltriethoxysilane (APTES) self-assembled monolayers (SAM) on a Si substrate. The thermal desorption and the thermal cleavage of the BPA and APTES SAM film on the Si substrate were studied by X-ray photoelectron spectroscopy (XPS) upon thermal treatment from 50 to 550 °C. XPS analyses show that the onset of the thermal desorption of the APTES monolayer occurs at 250 °C and the APTES SAM completely decomposed at 400 °C. Conversely, BPA SAM on Si shows that the onset of thermal desorption occurs at 350 °C, and the BPA SAM completely desorbed at approximately 500 °C. Our study revealed that the organophosphonate SAM is a more stable SAM in modifying the dielectric sidewalls of a Cu interconnect when compared to organosilane SAM. To overcome the spontaneous reaction of the organophosphonate film on the metal substrate, a simple orthogonal functionalization method using thiolate SAM as a sacrificial layer was also demonstrated in this study.
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Affiliation(s)
- Yu-Wei Chou
- Department of Materials Science
and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Shou-Yi Chang
- Department of Materials Science
and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Pei Yuin Keng
- Department of Materials Science
and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
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8
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Wu H, Li G, Hou J, Sotthewes K. Probing surface properties of organic molecular layers by scanning tunneling microscopy. Adv Colloid Interface Sci 2023; 318:102956. [PMID: 37393823 DOI: 10.1016/j.cis.2023.102956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 06/21/2023] [Accepted: 06/23/2023] [Indexed: 07/04/2023]
Abstract
In view of the relevance of organic thin layers in many fields, the fundamentals, growth mechanisms, and dynamics of thin organic layers, in particular thiol-based self-assembled monolayers (SAMs) on Au(111) are systematically elaborated. From both theoretical and practical perspectives, dynamical and structural features of the SAMs are of great intrigue. Scanning tunneling microscopy (STM) is a remarkably powerful technique employed in the characterization of SAMs. Numerous research examples of investigation about the structural and dynamical properties of SAMs using STM, sometimes combined with other techniques, are listed in the review. Advanced options to enhance the time resolution of STM are discussed. Additionally, we elaborate on the extremely diverse dynamics of various SAMs, such as phase transitions and structural changes at the molecular level. In brief, the current review is expected to supply a better understanding and novel insights regarding the dynamical events happening in organic SAMs and how to characterize these processes.
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Affiliation(s)
- Hairong Wu
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China; Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China.
| | - Genglin Li
- College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jirui Hou
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China; Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Kai Sotthewes
- Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, the Netherlands.
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9
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Mori Y, Cheon T, Kotsugi Y, Kim YH, Park Y, Ansari MZ, Mohapatra D, Jang Y, Bae JS, Kwon W, Kim G, Park YB, Lee HBR, Song W, Kim SH. Self-Formation of a Ru/ZnO Multifunctional Bilayer for the Next-Generation Interconnect Technology via Area-Selective Atomic Layer Deposition. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2300290. [PMID: 37127866 DOI: 10.1002/smll.202300290] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/23/2023] [Indexed: 05/03/2023]
Abstract
This study suggests a Ru/ZnO bilayer grown using area-selective atomic layer deposition (AS-ALD) as a multifunctional layer for advanced Cu metallization. As a diffusion barrier and glue layer, ZnO is selectively grown on SiO2 , excluding Cu, where Ru, as a liner and seed layer, is grown on both surfaces. Dodecanethiol (DDT) is used as an inhibitor for the AS-ALD of ZnO using diethylzinc and H2 O at 120 °C. H2 plasma treatment removes the DDT adsorbed on Cu, forming inhibitor-free surfaces. The ALD-Ru film is then successfully deposited at 220 °C using tricarbonyl(trimethylenemethane)ruthenium and O2 . The Cu/bilayer/Si structural and electrical properties are investigated to determine the diffusion barrier performance of the bilayer film. Copper silicide is not formed without the conductivity degradation of the Cu/bilayer/Si structure, even after annealing at 700 °C. The effect of ZnO on the Ru/SiO2 structure interfacial adhesion energy is investigated using a double-cantilever-beam test and is found to increase with ZnO between Ru and SiO2 . Consequently, the Ru/ZnO bilayer can be a multifunctional layer for advanced Cu interconnects. Additionally, the formation of a bottomless barrier by eliminating ZnO on the via bottom, or Cu, is expected to decrease the via resistance for the ever-shrinking Cu lines.
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Affiliation(s)
- Yuki Mori
- Chemical Materials Development Department, TANAKA Precious Metals, 22, Wadai, Tsukuba, Ibaraki, 300-4247, Japan
- Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of Korea
| | - Taehoon Cheon
- School of Materials Science and Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do, 38541, Republic of Korea
| | - Yohei Kotsugi
- Chemical Materials Development Department, TANAKA Precious Metals, 22, Wadai, Tsukuba, Ibaraki, 300-4247, Japan
| | - Youn-Hye Kim
- School of Materials Science and Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do, 38541, Republic of Korea
| | - Yejin Park
- School of Materials Science and Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do, 38541, Republic of Korea
| | - Mohd Zahid Ansari
- School of Materials Science and Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongsangbuk-do, 38541, Republic of Korea
| | - Debananda Mohapatra
- Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of Korea
| | - Yujin Jang
- Busan Center, Korea Basic Science Institute, 30, Gwahaksandan 1-ro 60beon-gil, Gangseo-gu, Busan, 46742, Republic of Korea
| | - Jong-Seong Bae
- Busan Center, Korea Basic Science Institute, 30, Gwahaksandan 1-ro 60beon-gil, Gangseo-gu, Busan, 46742, Republic of Korea
| | - Woobin Kwon
- School of Materials Science and Engineering, Andong National University, Andong-si, Gyeongsangbuk-do, 36729, Republic of Korea
| | - Gahui Kim
- School of Materials Science and Engineering, Andong National University, Andong-si, Gyeongsangbuk-do, 36729, Republic of Korea
| | - Young-Bae Park
- School of Materials Science and Engineering, Andong National University, Andong-si, Gyeongsangbuk-do, 36729, Republic of Korea
| | - Han-Bo-Ram Lee
- Department of Materials Science and Engineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Wooseok Song
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology, Daejeon, 34114, Republic of Korea
| | - Soo-Hyun Kim
- Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of Korea
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10
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Bailey MR, Gmür TA, Grillo F, Isa L. Modular Attachment of Nanoparticles on Microparticle Supports via Multifunctional Polymers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:3731-3741. [PMID: 37181676 PMCID: PMC10173378 DOI: 10.1021/acs.chemmater.3c00555] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/13/2023] [Indexed: 05/16/2023]
Abstract
Nanoparticles are key to a range of applications, due to the properties that emerge as a result of their small size. However, their size also presents challenges to their processing and use, especially in relation to their immobilization on solid supports without losing their favorable functionalities. Here, we present a multifunctional polymer-bridge-based approach to attach a range of presynthesized nanoparticles onto microparticle supports. We demonstrate the attachment of mixtures of different types of metal-oxide nanoparticles, as well as metal-oxide nanoparticles modified with standard wet chemistry approaches. We then show that our method can also create composite films of metal and metal-oxide nanoparticles by exploiting different chemistries simultaneously. We finally apply our approach to the synthesis of designer microswimmers with decoupled mechanisms of steering (magnetic) and propulsion (light) via asymmetric nanoparticle binding, aka Toposelective Nanoparticle Attachment. We envision that this ability to freely mix available nanoparticles to produce composite films will help bridge the fields of catalysis, nanochemistry, and active matter toward new materials and applications.
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11
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Ramos NC, Medlin JW, Holewinski A. Electrochemical Stability of Thiolate Self-Assembled Monolayers on Au, Pt, and Cu. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 36898023 DOI: 10.1021/acsami.3c01224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Self-assembled monolayers (SAMs) of thiolates have increasingly been used for modification of metal surfaces in electrochemical applications including selective catalysis (e.g., CO2 reduction, nitrogen reduction) and chemical sensing. Here, the stable electrochemical potential window of thiolate SAMs on Au, Pt, and Cu electrodes is systematically studied for a variety of thiols in aqueous electrolyte systems. For fixed tail-group functionality, the reductive stability of thiolate SAMs is found to follow the trend Au < Pt < Cu; this can be understood by considering the combined influences of the binding strength of sulfur and competitive adsorption of hydrogen. The oxidative stability of thiolate SAMs is found to follow the order: Cu < Pt < Au, consistent with each surface's propensity toward surface oxide formation. The stable reductive and oxidative potential limits are both found to vary linearly with pH, except for reduction above pH ∼10, which is independent of pH for most thiol compositions. The electrochemical stability across different functionalized thiols is then revealed to depend on many different factors including SAM defects (accessible surface metal atom sites decrease stability), intermolecular interactions (hydrophilic groups reduce the stability), and SAM thickness (stability increases with alkanethiol carbon chain length) as well as factors such as SAM-induced surface reconstruction and the ability to directly oxidize or reduce the non-sulfur part of the SAM molecule.
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Affiliation(s)
- Nathanael C Ramos
- Department of Chemical and Biological Engineering, University of Colorado Boulder, JSCBB, 3415 Colorado Avenue, Boulder, Colorado 80303, United States
- Renewable and Sustainable Energy Institute, University of Colorado Boulder, SEEC, 4001 Discovery Dr, Boulder, Colorado 80309, United States
| | - J Will Medlin
- Department of Chemical and Biological Engineering, University of Colorado Boulder, JSCBB, 3415 Colorado Avenue, Boulder, Colorado 80303, United States
| | - Adam Holewinski
- Department of Chemical and Biological Engineering, University of Colorado Boulder, JSCBB, 3415 Colorado Avenue, Boulder, Colorado 80303, United States
- Renewable and Sustainable Energy Institute, University of Colorado Boulder, SEEC, 4001 Discovery Dr, Boulder, Colorado 80309, United States
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12
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Shlesinger I, Palstra IM, Koenderink AF. Integrated Sideband-Resolved SERS with a Dimer on a Nanobeam Hybrid. PHYSICAL REVIEW LETTERS 2023; 130:016901. [PMID: 36669214 DOI: 10.1103/physrevlett.130.016901] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
In analogy to cavity optomechanics, enhancing specific sidebands of a Raman process with narrowband optical resonators would allow for parametric amplification, entanglement of light and molecular vibrations, and reduced transduction noise. We report on the demonstration of waveguide-addressable sideband-resolved surface-enhanced Raman scattering (SERS). We realized a hybrid plasmonic-photonic resonator consisting of a 1D photonic crystal cavity decorated with a sub-20 nm gap dimer nanoantenna. Hybrid resonances in the near-IR provide designer Q factors of 1000, and Q/V=(λ^{3}/10^{6})^{-1}, with SERS signal strength on par with levels found in state-of-the-art purely plasmonic systems. We evidence Fano line shapes in the SERS enhancement of organic molecules, and quantitatively separate out the pump enhancement and optical reservoir contributions.
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Affiliation(s)
- Ilan Shlesinger
- Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL1098XH Amsterdam, Netherlands
| | - Isabelle M Palstra
- Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL1098XH Amsterdam, Netherlands
- Institute of Physics, University of Amsterdam, NL1098XH Amsterdam, Netherlands
| | - A Femius Koenderink
- Department of Physics of Information in Matter and Center for Nanophotonics, NWO-I Institute AMOLF, Science Park 104, NL1098XH Amsterdam, Netherlands
- Institute of Physics, University of Amsterdam, NL1098XH Amsterdam, Netherlands
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13
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Gys N, Pawlak B, Lufungula LL, Marcoen K, Wyns K, Baert K, Atia TA, Spooren J, Adriaensens P, Blockhuys F, Hauffman T, Meynen V, Mullens S, Michielsen B. Selective Pd recovery from acidic leachates by 3-mercaptopropylphosphonic acid grafted TiO 2: does surface coverage correlate to performance? RSC Adv 2022; 12:36046-36062. [PMID: 36545072 PMCID: PMC9756939 DOI: 10.1039/d2ra07214a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
Modification of metal oxides with organophosphonic acids (PAs) provides the ability to control and tailor the surface properties. The metal oxide phosphonic acid bond (M-O-P) is known to be stable under harsh conditions, making PAs a promising candidate for the recovery of metals from complex acidic leachates. The thiol functional group is an excellent regenerable scavenging group for these applications. However, the research on organophosphonic acid grafting with thiol groups is very limited. In this study, four different metal sorbent materials were designed with different thiol surface coverages. An aqueous-based grafting of 3-mercaptopropylphosphonic acid (3MPPA) on mesoporous TiO2 was employed. Surface grafted thiol groups could be obtained in the range from 0.9 to 1.9 groups per nm2. The different obtained surface properties were studied and correlated to the Pd adsorption performance. High Pd/S adsorption efficiencies were achieved, indicating the presence of readily available sorption sites. A large difference in their selectivity towards Pd removal from a spend automotive catalyst leachate was observed due to the co-adsorption of Fe on the titania support. The highest surface coverage showed the highest selectivity (K d: 530 mL g-1) and adsorption capacity (Q max: 0.32 mmol g-1) towards Pd, while strongly reducing the co-adsorption of Fe on remaining TiO2 sites.
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Affiliation(s)
- Nick Gys
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium,Laboratory of Adsorption and Catalysis (LADCA), Department of Chemistry, University of Antwerp, Universiteitsplein 1Wilrijk 2610Belgium
| | - Bram Pawlak
- Analytical and Circular Chemistry (ACC), Institute for Materials Research (IMO), Hasselt UniversityAgoralaan 1Diepenbeek 3590Belgium
| | - Léon Luntadila Lufungula
- Structural Chemistry Group, Department of Chemistry, University of AntwerpGroenenborgerlaan 171Antwerp 2020Belgium
| | - Kristof Marcoen
- Research Group Electrochemical and Surface Engineering (SURF), Department Materials and Chemistry, Vrije Universiteit BrusselPleinlaan 2Brussels 1050Belgium
| | - Kenny Wyns
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium
| | - Kitty Baert
- Research Group Electrochemical and Surface Engineering (SURF), Department Materials and Chemistry, Vrije Universiteit BrusselPleinlaan 2Brussels 1050Belgium
| | - Thomas Abo Atia
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium,Department of Chemistry, KU LeuvenCelestijnenlaan 200FLeuven 3000Belgium
| | - Jeroen Spooren
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium
| | - Peter Adriaensens
- Analytical and Circular Chemistry (ACC), Institute for Materials Research (IMO), Hasselt UniversityAgoralaan 1Diepenbeek 3590Belgium
| | - Frank Blockhuys
- Structural Chemistry Group, Department of Chemistry, University of AntwerpGroenenborgerlaan 171Antwerp 2020Belgium
| | - Tom Hauffman
- Research Group Electrochemical and Surface Engineering (SURF), Department Materials and Chemistry, Vrije Universiteit BrusselPleinlaan 2Brussels 1050Belgium
| | - Vera Meynen
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium,Laboratory of Adsorption and Catalysis (LADCA), Department of Chemistry, University of Antwerp, Universiteitsplein 1Wilrijk 2610Belgium
| | - Steven Mullens
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium
| | - Bart Michielsen
- Sustainable Materials, Flemish Institute for Technological Research (VITO NV)Boeretang 200Mol 2400Belgium
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14
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Nguyen Van Ha, Dat DT, Huy NH. Oxygenation Induced Electronic Structure Changes in Anionic Platinum(II) Complex Bearing 2-Phenylpyridine and Benzene-1,2-dithiolate Ligands: Theoretical Study. RUSS J INORG CHEM+ 2022. [DOI: 10.1134/s0036023622601544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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15
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Xu W, Zhao X, Zhang F, Liu J, Zhang K, Guo X, Wen J, Zhang J, Liu X, Wang Y, Yang S, Zhang Y. Confined growth of Ag nanoflakes induced by LSPR-driven carrier transfer in periodic nanopatterned arrays. NANOSCALE 2022; 14:14750-14759. [PMID: 36173260 DOI: 10.1039/d2nr03385b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The growth of metal nanostructures induced by surface plasmons has attracted widespread attention and provides a wide range of applications in the development of plasmonic nanochemistry, biosensors, photoelectrochemical coupling reactions, etc. Herein, a simple method is reported for the fabrication of Ag nanoflakes induced by the surface plasma on two-dimensional periodic nanopatterned arrays with the aid of 4-MBA molecules. The light radiation, molecules, and environmental gases are selected to track the formation mechanism of Ag nanoflakes. The in situ Raman observations and theoretical analyses confirm that small aromatic molecules with carboxyl groups play important roles in Ag nanoflake formation derived by localized surface plasmon resonance (LSPR)-driven carriers, which provide profound insights into the study of LSPR-driven carriers, participating in chemical reactions and the reconstruction of dense hot spots in nanogaps.
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Affiliation(s)
- Wei Xu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Xiaoyu Zhao
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Fengyi Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Jia Liu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Kun Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Xiaojie Guo
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Jiahong Wen
- The College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
- Zhejiang Laboratory, Hangzhou 311100, P. R. China
| | - Jian Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Xiaolian Liu
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Yaxin Wang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
| | - Shikuan Yang
- Institute for Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
| | - Yongjun Zhang
- College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.
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16
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Sun P, Xie M, Zhang L, Liu J, Wu J, Li D, Yuan S, Wu T, Li D. Ultrastable Anti‐Acid “Shield” in Layered Silver Coordination Polymers. Angew Chem Int Ed Engl 2022; 61:e202209971. [DOI: 10.1002/anie.202209971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Peipei Sun
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
- School of Energy Materials and Chemical Engineering Hefei University Hefei 230601 China
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
| | - Mo Xie
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
| | - Lin‐Mei Zhang
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
| | - Jia‐Xing Liu
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
| | - Jin Wu
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
| | - Dong‐Sheng Li
- College of Materials and Chemical Engineering Hubei Provincial Collaborative Innovation Center for New Energy Microgrid Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University Yichang 443002 China
| | - Shang‐Fu Yuan
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
| | - Tao Wu
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
| | - Dan Li
- College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China
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17
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Sun P, Xie M, Zhang LM, Liu JX, Wu J, Li DS, Yuan SF, Wu T, Li D. Ultrastable Anti‐Acid "Shield" in Layered Silver Coordination Polymers. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Peipei Sun
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
| | - Mo Xie
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
| | - Lin-Mei Zhang
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
| | - Jia-Xing Liu
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
| | - Jin Wu
- Soochow University College of Chemistry, Chemical Engineering and Materials Science No 199 Ren'ai Road 215123 Suzhou CHINA
| | - Dong-Sheng Li
- China Three Gorges University College of Materials and Chemical Engineering CHINA
| | - Shang-Fu Yuan
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
| | - Tao Wu
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
| | - Dan Li
- Jinan University College of Chemistry and Materials Science 601 Huangpu Road West 510632 Guangzhou CHINA
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18
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Mesoporous platinum nanoparticles as a peroxidase mimic for the highly sensitive determination of C-reactive protein. Anal Bioanal Chem 2022; 414:7191-7201. [PMID: 35969280 DOI: 10.1007/s00216-022-04271-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 07/18/2022] [Accepted: 08/08/2022] [Indexed: 01/08/2023]
Abstract
The generation of a mesoporous structure in platinum nanoparticles can effectively enhance physical and chemical properties. In this study, mesoporous platinum nanoparticles (MPNs) were synthesized by a soft template-mediated one-pot chemical method. To develop a mesoporous structure, Pluronic F-127 was employed. The Pluronic F-127 surfactant forms self-assembled micelles, and the micelles act as the pore-directing agents in the synthesis of nanoparticles. Scanning electron microscopy results revealed that the MPN had a uniform size of 70 nm on average and a distinct mesoporous structure. The development of a concave mesoporous structure on the surface of the MPNs can increase the surface area and facilitate the efficient transport of reactants. The synthesized MPNs exhibited peroxidase-like activity. Furthermore, the MPNs showed excellent catalytic efficiency compared to HRP, due to the high surface area derived from the presence of the mesoporous structure. The peroxidase-like MPNs were applied to the enzyme-linked immunosorbent assay (ELISA) of C-reactive protein (CRP). The MPN-based ELISA exhibited sensitive CRP detection in the range from 0.24 to 7.8 ng/mL with a detection limit of 0.13 ng/mL. Moreover, the recoveries of the CRP concentrations in spiked human serum were 98.6% and 102%. These results demonstrate that as a peroxidase mimic, the MPNs can replace the natural enzymes in conventional ELISA for sensitive CRP detection.
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19
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Luo J, Liang Y, Montag M, Diskin-Posner Y, Avram L, Milstein D. Controlled Selectivity through Reversible Inhibition of the Catalyst: Stereodivergent Semihydrogenation of Alkynes. J Am Chem Soc 2022; 144:13266-13275. [PMID: 35839274 PMCID: PMC9374179 DOI: 10.1021/jacs.2c04233] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Catalytic semihydrogenation of internal alkynes using
H2 is an attractive atom-economical route to various alkenes,
and its
stereocontrol has received widespread attention, both in homogeneous
and heterogeneous catalyses. Herein, a novel strategy is introduced,
whereby a poisoning catalytic thiol is employed as a reversible inhibitor
of a ruthenium catalyst, resulting in a controllable H2-based semihydrogenation of internal alkynes. Both (E)- and (Z)-alkenes were obtained efficiently and
highly selectively, under very mild conditions, using a single homogeneous
acridine-based ruthenium pincer catalyst. Mechanistic studies indicate
that the (Z)-alkene is the reaction intermediate
leading to the (E)-alkene and that the addition of
a catalytic amount of bidentate thiol impedes the Z/E isomerization step by forming stable ruthenium
thiol(ate) complexes, while still allowing the main hydrogenation
reaction to proceed. Thus, the absence or presence of catalytic thiol
controls the stereoselectivity of this alkyne semihydrogenation, affording
either the (E)-isomer as the final product or halting
the reaction at the (Z)-intermediate. The developed
system, which is also applied to the controllable isomerization of
a terminal alkene, demonstrates how metal catalysis with switchable
selectivity can be achieved by reversible inhibition of the catalyst
with a simple auxiliary additive.
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Affiliation(s)
- Jie Luo
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yaoyu Liang
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Michael Montag
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yael Diskin-Posner
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Liat Avram
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - David Milstein
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
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20
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Yang J, Xie S, Zhang H, Xu W, Dong A, Tang Y. Synthesis of silica-stabilized Ag 44 clusters aided by a designed mercaptosilane ligand. Chem Commun (Camb) 2022; 58:6849-6852. [PMID: 35616577 DOI: 10.1039/d2cc02505a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The novel and precise design of both a microscopic ligand and macroscopic structure has been demonstrated to improve the stability and potential optical applications of Ag44 clusters. The ligand with designed silane substituents on its thiophenol enabled the synthesized [Ag44(SPhSi(OEt)3)30](PPh4)4 clusters to maintain UV-vis absorption for 13 h when heated at 60 °C in air and be readily coated with silica shells via a one-pot reverse microemulsion method. This composite structure overcomes the issue that non-luminescent Ag44 clusters cannot be applied in photothermal and photoacoustic imaging due to their instability.
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Affiliation(s)
- Jinyu Yang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
| | - Shoudong Xie
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
| | - Hui Zhang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
| | - Wenhao Xu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
| | - Angang Dong
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
| | - Yun Tang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
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21
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Stohmann P, Koch S, Yang Y, Kaiser CD, Ehrens J, Schnack J, Biere N, Anselmetti D, Gölzhäuser A, Zhang X. Investigation of electron-induced cross-linking of self-assembled monolayers by scanning tunneling microscopy. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:462-471. [PMID: 35673603 PMCID: PMC9152271 DOI: 10.3762/bjnano.13.39] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Ultrathin membranes with subnanometer pores enabling molecular size-selective separation were generated on surfaces via electron-induced cross-linking of self-assembled monolayers (SAMs). The evolution of p-terphenylthiol (TPT) SAMs on Au(111) surfaces into cross-linked monolayers was observed with a scanning tunneling microscope. As the irradiation dose was increased, the cross-linked regions continued to grow and a large number of subnanometer voids appeared. Their equivalent diameter is 0.5 ± 0.2 nm and the areal density is ≈1.7 × 1017 m-2. Supported by classical molecular dynamics simulations, we propose that these voids may correspond to free volumes inside a cross-linked monolayer.
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Affiliation(s)
- Patrick Stohmann
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Sascha Koch
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Yang Yang
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Christopher David Kaiser
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Julian Ehrens
- Condensed Matter Theory Group, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Jürgen Schnack
- Condensed Matter Theory Group, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Niklas Biere
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Dario Anselmetti
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Armin Gölzhäuser
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Xianghui Zhang
- Physics of Supramolecular Systems and Surfaces, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
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22
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Kukk E, Püttner R, Simon M. Recoil lineshapes in hard X-ray photoelectron spectra of large molecules - free and anchored-on-surface 10-aminodecane-1-thiol. Phys Chem Chem Phys 2022; 24:10465-10474. [PMID: 35441614 DOI: 10.1039/d1cp05777d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core-level photoelectron spectroscopy of molecules presents unique opportunities but also challenges in the Hard X-ray Spectroscopy (HAXPES) realm. Here we focus on the manifestation of the photoelectron recoil effects in core-level photoemission spectra, using the independent normal-mode oscillators approach that allows to model and investigate the resulting recoil lineshapes for molecules of large sizes with only a slight computational effort. We model the recoil lineshape for N 1s and C 1s photoemission using the 10-aminodecane-1-thiol molecule as an example. It represents also a class of compounds commonly used in creating self-assembled monolayers (SAMs) on surfaces. Attachment of the -SH head group to the surface is modelled here in a simplified way by anchoring the sulfur atom of a single molecule. The effects of the orientation of photoemission in the molecular frame on the recoil lineshape of such anchored molecules are illustrated and discussed as a possible geometry probe. Time-evolution of the recoil excitations from the initial emission site across the entire molecule is also visualized.
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Affiliation(s)
- Edwin Kukk
- Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
| | - Ralph Püttner
- Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Marc Simon
- Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
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23
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Greydanus B, Saleheen M, Wu H, Heyden A, Medlin JW, Schwartz DK. Probing surface-adsorbate interactions through active particle dynamics. J Colloid Interface Sci 2022; 614:425-435. [DOI: 10.1016/j.jcis.2022.01.053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/05/2022] [Accepted: 01/07/2022] [Indexed: 01/15/2023]
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24
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Electrochemical biosensor with aptamer/porous platinum nanoparticle on round-type micro-gap electrode for saxitoxin detection in fresh water. Biosens Bioelectron 2022; 210:114300. [PMID: 35489276 DOI: 10.1016/j.bios.2022.114300] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 03/15/2022] [Accepted: 04/19/2022] [Indexed: 12/15/2022]
Abstract
Cyanotoxins are toxins produced by cyanobacteria; they negatively impact water resources used by humans and disrupt ecosystems worldwide. Among cyanotoxins, saxitoxin (STX) is a small molecule that causes paralysis in humans and contamination in freshwater resources. To monitor low concentration of STX levels, a sensitive and high fidelity detection system is required. In this study, a round-type micro-gap electrode (RMGE) was fabricated that provides the high signal fidelity for STX detection in real freshwater sample. The RMGE has the 15 pairs of identical electrode wire length between gap that gives the high signal fidelity. In addition, the sensitivity for STX detection was improved by introducing the porous platinum nanoparticle (pPtNP) that enahced the electrochemical sensitivity and the STX aptamer was used as the bioprobe. An electrochemical measurement method (square wave voltammetry (SWV) and electrochemical impedance spectroscopy (EIS)) was introduced to construct STX biosensor. To evaluate the biosensor performance, the limit of detection (LOD) and selectivity test were performed on real freshwater samples. The biosensor demonstrated high selectivity even in freshwater samples over a wide linear concentration range of 10 pg/mL to 1 μg/mL and a detection limit of 4.669 pg/mL. These results suggest that the designed biosensor shows a wide range of possibilities for the detection of toxicants in freshwater that provide the new direction to the biosensor electrode design.
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25
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Berdiyorov G, Hamoudi H. Electronic transport properties of a single biphenyl molecule anchored on Au(111)with sulfur, selenium, and tellurium atoms. J Chem Phys 2022; 156:174701. [DOI: 10.1063/5.0076759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Selenium and tellurium have recently been proposed as alternative to sulfur anchoring groups for self-assembly of organic molecules on noble-metal substrates. Here, we conduct quantum transport calculations for a single biphenyl molecule anchored on Au (111) electrodes with thiolate, selenolate and telluride terminal groups taking into account both dispersive interactions and spin-orbit coupling. The numerical results show that the current through the junction decreases with increasing the mass of the chalcogen atom due to nanoscale charge localization as revealed in transmission eigenstates analysis. The effect of spin-orbit coupling becomes more pronounced with increasing the mass of the chalcogen atom. Clear current rectification is obtained when the molecule is asymmetrically connected to the electrodes using different chalcogen atoms. These findings can be useful inexploring transport properties of organic molecules adsorbed on metallic surfaces using alternative to sulfur chalcogen atoms.
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26
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Po H, Dabard C, Roman B, Reyssat E, Bico J, Baptiste B, Lhuillier E, Ithurria S. Chiral Helices Formation by Self-Assembled Molecules on Semiconductor Flexible Substrates. ACS NANO 2022; 16:2901-2909. [PMID: 35107969 DOI: 10.1021/acsnano.1c09982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The crystal structure of atomically defined colloidal II-VI semiconductor nanoplatelets (NPLs) induces the self-assembly of organic ligands over thousands of square nanometers on the top and bottom basal planes of these anisotropic nanoparticles. NPLs curl into helices under the influence of the surface stress induced by these ligands. We demonstrate the control of the radii of NPL helices through the ligands described as an anchoring group and an aliphatic chain of a given length. A mechanical model accounting for the misfit strain between the inorganic core and the surface ligands predicts the helices' radii. We show how the chirality of the helices can be tuned by the ligands anchoring group and inverted from one population to another.
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Affiliation(s)
- Hong Po
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France
| | - Corentin Dabard
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France
| | - Benoit Roman
- Physique et Mécanique des Milieux Hétérogènes, ESPCI-Paris, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
| | - Etienne Reyssat
- Physique et Mécanique des Milieux Hétérogènes, ESPCI-Paris, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
| | - José Bico
- Physique et Mécanique des Milieux Hétérogènes, ESPCI-Paris, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
| | - Benoit Baptiste
- Sorbonne Université, CNRS, Institut de minéralogie, de physique des matériaux et de cosmochimie, IMPMC, F-75005 Paris, France
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France
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27
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Gupta R, Jash P, Sachan P, Bayat A, Singh V, Mondal PC. Electrochemical Potential‐Driven High‐Throughput Molecular Electronic and Spintronic Devices: From Molecules to Applications. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ritu Gupta
- Department of Chemistry Indian Institute of Technology Kanpur Uttar Pradesh 208016 India
| | - Priyajit Jash
- Department of Chemistry Indian Institute of Technology Kanpur Uttar Pradesh 208016 India
| | - Pradeep Sachan
- Department of Chemistry Indian Institute of Technology Kanpur Uttar Pradesh 208016 India
| | - Akhtar Bayat
- Laboratoire Photonique Numérique et Nanosciences, UMR 5298 Université de Bordeaux 33400 Talence France
| | - Vikram Singh
- Department of Chemistry and National Science Research Institute Korea Advanced Institute of Science and Technology 291 Daehak-ro, Yuseong-gu Daejeon 34141 Republic of Korea
| | - Prakash Chandra Mondal
- Department of Chemistry Indian Institute of Technology Kanpur Uttar Pradesh 208016 India
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28
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Hewa-Rahinduwage CC, Silva KL, Geng X, Brock SL, Luo L. Electrochemical gelation of quantum dots using non-noble metal electrodes at high oxidation potentials. NANOSCALE 2021; 13:20625-20636. [PMID: 34877956 DOI: 10.1039/d1nr06615c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Relative to conventional chemical approaches, electrochemical assembly of metal chalcogenide nanoparticles enables the use of two additional levers for tuning the assembly process: electrode material and potential. In our prior work, oxidative and metal-mediated pathways for electrochemical assembly of metal chalcogenide quantum dots (QDs) into three-dimensional gel architectures were investigated independently by employing a noble-metal (Pt) electrode at relatively high potentials and a non-noble metal electrode at relatively low potentials, respectively. In the present work, we reveal competition between the two electrogelation pathways under the condition of high oxidation potentials and non-noble metal electrodes (including Ni, Co, Zn, and Ag), where both pathways are active. We found that the electrogel structure formed under this condition is electrode material-dependent. For Ni, the major phase is oxidative electrogel, not a potential-dependent mixture of oxidative and metal-mediated electrogel that one would expect. A mechanistic study reveals that the metal-mediated electrogelation is suppressed by dithiolates, a side product from the oxidative electrogelation, which block the Ni electrode surface and terminate metal ion release. In contrast, for Co, Ag, and Zn, the electrode surface blockage by dithiolates is less effective than for Ni, such that metal-mediated electrogelation is the primary gelation pathway.
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Affiliation(s)
| | - Karunamuni L Silva
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
| | - Xin Geng
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
| | - Stephanie L Brock
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
| | - Long Luo
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
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29
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Ma T, Bizzotto D. Improved Thermal Stability and Homogeneity of Low Probe Density DNA SAMs Using Potential-Assisted Thiol-Exchange Assembly Methods. Anal Chem 2021; 93:15973-15981. [PMID: 34813297 DOI: 10.1021/acs.analchem.1c03353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Methods for producing DNA SAM-based sensors with improved thermal stability and control over the homogeneity of low DNA probe density will enable advanced sensor development. The thermal stability of low-coverage DNA SAMs was studied for surfaces prepared using potential-assisted thiol exchange (Edep) and compared to DNA SAMs prepared without control over the substrate potential (OCPdep). Both surface preparation methods were studied using in situ fluorescence microscopy and electrochemistry with fluorophore or redox-modified DNA SAMs on a single-crystal gold bead electrode. Fluorescence microscopy showed that the influence of the underlying surface crystallography was important in both cases. The highest thermal stability was realized for square or rectangular surface atomic structure (e.g., surfaces from 110 to 100). The 111 and related surfaces were the least thermally stable. The low DNA coverage surfaces prepared by Edep had better thermal stability and higher DNA probe mobility as compared to OCPdep-prepared surfaces with the similar coverage. These results were correlated with methylene blue redox-tagged DNA probes, which directly measured the average DNA coverage. Both methods indicated that Edep DNA SAMs were more uniformly distributed across the electrode surface, while the surfaces prepared via OCPdep assembled into clusters with reduced mobility. The potential-assisted thiol-exchange approach to preparing low-coverage DNA SAMs was shown to quickly create modified surfaces that were consistent, had mobility characteristics which should yield superior DNA hybridization efficiencies, and having greater thermal stability which will translate into a longer shelf-life.
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Affiliation(s)
- Tianxiao Ma
- AMPEL, University of British Columbia, Vancouver V6T 1Z4, Canada.,Department of Chemistry, University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Dan Bizzotto
- AMPEL, University of British Columbia, Vancouver V6T 1Z4, Canada.,Department of Chemistry, University of British Columbia, Vancouver V6T 1Z4, Canada
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30
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Aizawa M, Akiyama H, Matsuzawa Y. Convenient preparation of stimulus-responsive molecular layers containing anthracene molecules to control surface properties. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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31
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Rana S, Kaur A, Bharti A, Singh S, Bhatnagar A, Prabhakar N. Electrochemical detection of hepcidin based on spiegelmer and MoS 2NF-GNR@AuNPs as sensing platform. Anal Chim Acta 2021; 1181:338863. [PMID: 34556214 DOI: 10.1016/j.aca.2021.338863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 07/02/2021] [Accepted: 07/19/2021] [Indexed: 12/30/2022]
Abstract
Spiegelmers, mirror image L- RNA oligonucleotides, possesses high plasma stability and non-immunogenicity. Herein, a novel spiegelmer based impedimetric biosensor grafted with Au nanoparticles and molybdenum disulfide nanoflowers/graphene nanoribbons nanocomposite has been designed to detect hepcidin in spiked-in human serum sample. Firstly, molybdenum disulfide nanoflowers/graphene nanoribbons (MoS2NF-GNR) hybrid was drop-casted onto the FTO electrode followed by electro deposition of Au nanoparticles (AuNPs). Hepcidin specific thiolated spiegelmer was then immobilized on the MoS2NF-GNR@AuNPs for hepcidin detection. Electrochemical impedance spectroscopy was used to assess the performance of the sensing platform based on the variation of charge transfer resistance (ΔRct) relative to the Fe(CN)64-/3- electrochemical probe in the presence of hepcidin. The impedance signals were recorded at the frequency range of 10-1 to 105 Hz and potential was set as 0.18 V. Under optimized conditions, the limit of detection of spiegelmer based sensor for hepcidin was 0.173 pgmL-1 within a wide linear range of 0.005-10 ngmL-1. The biosensor possesses selectivity, acceptable reproducibility with RSD as 4.76% and stability for up to 20 days. The satisfactory recovery result (89.8-103.1 %) in human serum indicates that the sensor has applicability in clinical monitoring of hepcidin.
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Affiliation(s)
- Shilpa Rana
- Department of Biochemistry, Sector-25, Panjab University, Chandigarh, 160014, India
| | - Amandeep Kaur
- Department of Biochemistry, Sector-25, Panjab University, Chandigarh, 160014, India
| | - Anu Bharti
- Department of Biochemistry, Sector-25, Panjab University, Chandigarh, 160014, India
| | - Suman Singh
- CSIR- Central Scientific Instruments Organization, Sector-30-C, Chandigarh, 160030, India
| | - Archana Bhatnagar
- Department of Biochemistry, Sector-25, Panjab University, Chandigarh, 160014, India
| | - Nirmal Prabhakar
- Department of Biochemistry, Sector-25, Panjab University, Chandigarh, 160014, India.
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32
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Solodenko H, Stender P, Schmitz G. Atom Probe Study of 1-Octadecanethiol Self-Assembled Monolayers on Platinum (111) and (200) Surfaces. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2021; 28:1-10. [PMID: 34490841 DOI: 10.1017/s1431927621012654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Atom probe tomography measurements of self-assembled monolayers of 1-octadecanethiol on platinum tips were performed and their fragmentation behavior under the influence of different laser powers was investigated. The carbon backbone evaporates in the form of small hydrocarbon fragments consisting of one to four carbon atoms, while sulfur evaporates exclusively as single ions. The carbon molecules evaporate at very low fields of 5.9 V/nm, while S requires a considerably higher evaporation field of 23.4 V/nm. With increasing laser power, a weak, but noticeable trend toward larger fragment sizes is observed. No hydrocarbon fragments containing S are detected, indicating that a strong S–Pt bond has formed. The observed surface coverage of S fits well with literature values and is higher for (111)-oriented samples than for (200).
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Affiliation(s)
- Helena Solodenko
- Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569Stuttgart, Germany
| | - Patrick Stender
- Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569Stuttgart, Germany
| | - Guido Schmitz
- Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569Stuttgart, Germany
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33
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Gupta R, Jash P, Sachan P, Bayat A, Singh V, Mondal PC. Electrochemical Potential-Driven High-Throughput Molecular Electronic and Spintronic Devices: From Molecules to Applications. Angew Chem Int Ed Engl 2021; 60:26904-26921. [PMID: 34313372 DOI: 10.1002/anie.202104724] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Indexed: 01/25/2023]
Abstract
Molecules are fascinating candidates for constructing tunable and electrically conducting devices by the assembly of either a single molecule or an ensemble of molecules between two electrical contacts followed by current-voltage (I-V) analysis, which is often termed "molecular electronics". Recently, there has been also an upsurge of interest in spin-based electronics or spintronics across the molecules, which offer additional scope to create ultrafast responsive devices with less power consumption and lower heat generation using the intrinsic spin property rather than electronic charge. Researchers have been exploring this idea of utilizing organic molecules, organometallics, coordination complexes, polymers, and biomolecules (proteins, enzymes, oligopeptides, DNA) in integrating molecular electronics and spintronics devices. Although several methods exist to prepare molecular thin-films on suitable electrodes, the electrochemical potential-driven technique has emerged as highly efficient. In this Review we describe recent advances in the electrochemical potential driven growth of nanometric various molecular films on technologically relevant substrates, including non-magnetic and magnetic electrodes to investigate the stimuli-responsive charge and spin transport phenomena.
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Affiliation(s)
- Ritu Gupta
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh, 208016, India
| | - Priyajit Jash
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh, 208016, India
| | - Pradeep Sachan
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh, 208016, India
| | - Akhtar Bayat
- Laboratoire Photonique Numérique et Nanosciences, UMR 5298, Université de Bordeaux, 33400, Talence, France
| | - Vikram Singh
- Department of Chemistry and National Science Research Institute, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Prakash Chandra Mondal
- Department of Chemistry, Indian Institute of Technology Kanpur, Uttar Pradesh, 208016, India
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34
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Xu W, Mihhels K, Kotov N, Lepikko S, Ras RHA, Johnson CM, Pettersson T, Kontturi E. Solid-state polymer adsorption for surface modification: The role of molecular weight. J Colloid Interface Sci 2021; 605:441-450. [PMID: 34333417 DOI: 10.1016/j.jcis.2021.07.062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/11/2021] [Accepted: 07/12/2021] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS Solid-state polymer adsorption offers a distinct approach for surface modification. These ultrathin, so-called Guiselin layers can easily be obtained by placing a polymer melt in contact with an interface, followed by a removal of the non-adsorbed layer with a good solvent. While the mechanism of formation has been well established for Guiselin layers, their stability, crucial from the perspective of materials applications, is not. The stability is a trade-off in the entropic penalty between cooperative detachment of the number of segments directly adsorbed on the substrate and consecutively pinned monomers. EXPERIMENTS Experimental model systems of Guiselin layers of polystyrene (PS) on silicon wafers with native oxide layer on top were employed. The stability of the adsorbed layers was studied as a function of PS molecular weight and polydispersibility by various microscopic and spectroscopic tools as well as quasi-static contact angle measurements. FINDINGS Adsorbed layers from low molecular weight PS were disrupted with typical spinodal decomposition patterns whereas high molecular weight (>500 kDa) PS resulted in stable, continuous layers. Moreover, we show that Guiselin layers offer an enticing way to modify a surface, as demonstrated by adsorbed PS that imparts a hydrophobic character to initially hydrophilic silicon wafers.
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Affiliation(s)
- Wenyang Xu
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland; Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, 10044 Stockholm, Sweden.
| | - Karl Mihhels
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland
| | - Nikolay Kotov
- Department of Chemistry, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Sakari Lepikko
- Department of Applied Physics, School of Science, Aalto University, Espoo, Finland
| | - Robin H A Ras
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland; Department of Applied Physics, School of Science, Aalto University, Espoo, Finland
| | - C Magnus Johnson
- Department of Chemistry, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Torbjörn Pettersson
- Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, 10044 Stockholm, Sweden; Wallenberg Wood Science Centre, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, 10044 Stockholm, Sweden.
| | - Eero Kontturi
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland.
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35
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Gray TP, Nishida J, Johnson SC, Raschke MB. 2D Vibrational Exciton Nanoimaging of Domain Formation in Self-Assembled Monolayers. NANO LETTERS 2021; 21:5754-5759. [PMID: 34156252 DOI: 10.1021/acs.nanolett.1c01515] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Order, disorder, and domains affect many of the functional properties in self-assembled monolayers (SAMs). However, carrier transport, wettability, and chemical reactivity are often associated with collective effects, where conventional imaging techniques have limited sensitivity to the underlying intermolecular coupling. Here we demonstrate vibrational excitons as a molecular ruler of intermolecular wave function delocalization and nanodomain size in SAMs. In the model system of a 4-nitrothiophenol (4-NTP) SAM on gold, we resolve coupling-induced peak shifts of the nitro symmetric stretch mode with full spatio-spectral infrared scattering scanning near-field optical microscopy. From modeling of the underlying 2D Hamiltonian, we infer domain sizes and their distribution ranging from 3 to 12 nm across a field of view on the micrometer scale. This approach of vibrational exciton nanoimaging is generally applicable to study structural phases and domains in SAMs and other molecular interfaces.
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Affiliation(s)
- Thomas P Gray
- Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Colorado 80309, United States
| | - Jun Nishida
- Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Colorado 80309, United States
| | - Samuel C Johnson
- Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Colorado 80309, United States
| | - Markus B Raschke
- Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, Colorado 80309, United States
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36
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Ahmed A, Banjac K, Verlekar SS, Cometto FP, Lingenfelder M, Galland C. Structural Order of the Molecular Adlayer Impacts the Stability of Nanoparticle-on-Mirror Plasmonic Cavities. ACS PHOTONICS 2021; 8:1863-1872. [PMID: 34164567 PMCID: PMC8212294 DOI: 10.1021/acsphotonics.1c00645] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Indexed: 05/06/2023]
Abstract
Immense field enhancement and nanoscale confinement of light are possible within nanoparticle-on-mirror (NPoM) plasmonic resonators, which enable novel optically activated physical and chemical phenomena and render these nanocavities greatly sensitive to minute structural changes, down to the atomic scale. Although a few of these structural parameters, primarily linked to the nanoparticle and the mirror morphology, have been identified, the impact of molecular assembly and organization of the spacer layer between them has often been left uncharacterized. Here, we experimentally investigate how the complex and reconfigurable nature of a thiol-based self-assembled monolayer (SAM) adsorbed on the mirror surface impacts the optical properties of the NPoMs. We fabricate NPoMs with distinct molecular organizations by controlling the incubation time of the mirror in the thiol solution. Afterward, we investigate the structural changes that occur under laser irradiation by tracking the bonding dipole plasmon mode, while also monitoring Stokes and anti-Stokes Raman scattering from the molecules as a probe of their integrity. First, we find an effective decrease in the SAM height as the laser power increases, compatible with an irreversible change of molecule orientation caused by heating. Second, we observe that the nanocavities prepared with a densely packed and more ordered monolayer of molecules are more prone to changes in their resonance compared to samples with sparser and more disordered SAMs. Our measurements indicate that molecular orientation and packing on the mirror surface play a key role in determining the stability of NPoM structures and hence highlight the under-recognized significance of SAM characterization in the development of NPoM-based applications.
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Affiliation(s)
- Aqeel Ahmed
- Laboratory
of Quantum and Nano-Optics and Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Karla Banjac
- Max
Planck-EPFL Laboratory for Molecular Nanoscience and Institute of
Physics, École Polytechnique Fédérale
de Lausanne, CH-1015 Lausanne, Switzerland
| | - Sachin S. Verlekar
- Laboratory
of Quantum and Nano-Optics and Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Fernando P. Cometto
- Max
Planck-EPFL Laboratory for Molecular Nanoscience and Institute of
Physics, École Polytechnique Fédérale
de Lausanne, CH-1015 Lausanne, Switzerland
- Departamento
de Fisicoquímica, Instituto de Investigaciones en Fisicoquímica
de Córdoba, INFIQC−CONICET, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Magalí Lingenfelder
- Max
Planck-EPFL Laboratory for Molecular Nanoscience and Institute of
Physics, École Polytechnique Fédérale
de Lausanne, CH-1015 Lausanne, Switzerland
- E-mail:
| | - Christophe Galland
- Laboratory
of Quantum and Nano-Optics and Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
- E-mail:
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37
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Yan T, Fichthorn KA. Self-Assembly of a Linear Alkylamine Bilayer around a Cu Nanocrystal: Molecular Dynamics. J Phys Chem B 2021; 125:4178-4186. [PMID: 33872508 DOI: 10.1021/acs.jpcb.1c02043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Copper nanocrystals are often grown with the help of alkylamine capping agents, which direct the nanocrystal shape. However, the role of these molecules is still unclear. We characterized the assembly of aqueous tetradecylamine (TDA) around a Cu nanocrystal and found that TDA exhibits a temperature-dependent bilayer structure. The bilayer involves an inner layer, in which TDA binds to Cu via the amine group and tends to orient the alkyl tail perpendicular to the surface, and an outer layer whose structure depends on temperature. At low temperatures, alkylamines in the inner layer form bundles with no apparent relation to the crystal facets. Alkylamines in the outer layer tend to orient their long axes perpendicular to the Cu surfaces, with interdigitation into the inner layer. At high temperatures, alkylamines in the inner layer lose their bundle structure, and outer-layer alkylamines tend to orient themselves tangential to the Cu surfaces, forming a "web" above inner-layer TDA. TDA exhibits a rapid interlayer exchange at typical synthesis temperatures, consistent with experiment. The variety in the assemblies seen here and in other studies of alkanethiols around gold nanocrystals indicates a richness in the assemblies that can be achieved by modulating the interaction between the strongly binding end group and the surface.
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Affiliation(s)
- Tianyu Yan
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Kristen A Fichthorn
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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38
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Grimm OC, Somaratne RMDS, Wang Y, Kim S, Whitten JE. Thiol adsorption on metal oxide nanoparticles. Phys Chem Chem Phys 2021; 23:8309-8317. [PMID: 33875995 DOI: 10.1039/d1cp00506e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of 2-naphthalenethiol (2-NPT) and methanethiol (MT) on 13 different metal oxide nanoparticles, of approximately 30 nm average primary particle size, has been investigated. In the case of 2-NPT, which is fluorescent, a screening method to assess adsorption was developed that consists of mixing the nanoparticles with a dilute ethanolic solution of 2-NPT and performing several cycles of centrifuging and rinsing with ethanol. Fluorescence measurements on the re-dispersed particle suspensions were then used to diagnose whether or not adsorption had occurred. Complementary experiments were performed by mounting powder samples of each of the metal oxide nanoparticles onto sample stubs and performing X-ray photoelectron spectroscopy (XPS) before and after in situ dosing with MT. In both cases, adsorption was observed only on ZnO, TiO2, and In2O3. Adsorption did not occur on Al2O3, CeO2, Fe2O3, Gd2O3, Ho2O3, NiO, SiOx, WO3, Y2O3, and ZrO2. Density functional theory (DFT) calculations were performed using small metal oxide clusters, assuming that dissociative adsorption occurs by replacement of a hydroxyl group attached to a metal site and the formation of water. The theoretical and experimental results generally agree, suggesting that this is indeed the adsorption mechanism for most of the nanoparticles. The agreement also suggests that the size and geometry of the nanoclusters play a minor role and that the relative strengths of the metal-sulfur and metal-hydroxyl bonds dictate thiol adsorption. This work has important implications related to the functionalization of metal oxide nanoparticles and surfaces.
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Affiliation(s)
- Owen C Grimm
- Department of Chemistry, The University of Massachusetts Lowell, Lowell, MA 01854, USA.
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39
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Basu A, Vaskevich A, Chuntonov L. Glutathione Self-Assembles into a Shell of Hydrogen-Bonded Intermolecular Aggregates on "Naked" Silver Nanoparticles. J Phys Chem B 2021; 125:895-906. [PMID: 33440116 DOI: 10.1021/acs.jpcb.0c10089] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A detailed understanding of the molecular structure in nanoparticle ligand capping layers is crucial for their efficient incorporation into modern scientific and technological applications. Peptide ligands render the nanoparticles as biocompatible materials. Glutathione, a γ-ECG tripeptide, self-assembles into aggregates on the surface of ligand-free silver nanoparticles through intermolecular hydrogen bonding and forms a few nanometer-thick shells. Two-dimensional nonlinear infrared (2DIR) spectroscopy suggests that aggregates adopt a conformation resembling the β-sheet secondary structure. The shell thickness was evaluated with localized surface plasmon resonance spectroscopy and X-ray photoelectron spectroscopy. The amount of glutathione on the surface was obtained with spectrophotometry of a thiol-reactive probe. Our results suggest that the shell consists of ∼15 stacked molecular layers. These values correspond to the inter-sheet distances, which are significantly shorter than those in amyloid fibrils with relatively bulky side chains, but are comparable to glycine-rich silk fibrils, where the side chains are compact. The tight packing of the glutathione layers can be facilitated by hydrogen-bonded carboxylic acid dimers of glycine and the intermolecular salt bridges between the zwitterionic γ-glutamyl groups. The structure of the glutathione aggregates was studied by 2DIR spectroscopy of the amide-I vibrational modes using 13C isotope labeling of the cysteine carbonyl. Isotope dilution experiments revealed the coupling of modes forming vibrational excitons along the cysteine chain. The coupling along the γ-glutamyl exciton chain was estimated from these values. The obtained coupling strengths are slightly lower than those of native β-sheets, yet they appear large enough to point onto an ordered conformation of the peptides within the aggregate. Analysis of the excitons' anharmonicities and the strength of the transition dipole moments generally is in agreement with these observations.
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Affiliation(s)
- Arghyadeep Basu
- Schulich Faculty of Chemistry and Solid State Institute, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - Alexander Vaskevich
- Department of Materials and Interfaces, and Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Lev Chuntonov
- Schulich Faculty of Chemistry and Solid State Institute, Technion - Israel Institute of Technology, Haifa 3200003, Israel
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40
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Ozcelik A, Pereira-Cameselle R, Alonso-Gómez JL. From Allenes to Spirobifluorenes: On the Way to Device-compatible Chiroptical Systems. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999201013164534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The last decade has seen a huge growth in the construction of chiral systems to
expand the scope of chiroptical applications. Dependence of chiroptical response on molecular
conformation typically leads to low chiroptical intensities of chiral systems that feature
several conformations in solution. In this respect, allenes were employed for the preparation
of open and cyclic oligomers as well as molecular cages, presenting remarkable chiroptical
responses in solution. Their molecular chirality was also transferred to metal surfaces, yet
photoisomerization of allenes limited their further exploration. In search of a more robust
chiral axis, theoretical and experimental studies confirmed that spirobifluorenes could give
rise to stable systems with tailored optical and chiroptical properties. Additionally, incorporating
a conformational lock into spirobifluorene cyclic architectures served as an efficient
strategy towards the generation of distinct helical molecular orbitals. This review article outlines our results on developing
device-compatible chiroptical systems through axially chiral allenes and spirobifluorenes. The contribution
from other research groups is presented briefly.
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Affiliation(s)
- Ani Ozcelik
- Department of Organic Chemistry, Faculty of Chemistry, University of Vigo, Vigo, Spain
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Dief EM, Vogel YB, Peiris CR, Le Brun AP, Gonçales VR, Ciampi S, Reimers JR, Darwish N. Covalent Linkages of Molecules and Proteins to Si-H Surfaces Formed by Disulfide Reduction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:14999-15009. [PMID: 33271017 DOI: 10.1021/acs.langmuir.0c02391] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Thiols and disulfide contacts have been, for decades, key for connecting organic molecules to surfaces and nanoclusters as they form self-assembled monolayers (SAMs) on metals such as gold (Au) under mild conditions. In contrast, they have not been similarly deployed on Si owing to the harsh conditions required for monolayer formation. Here, we show that SAMs can be simply formed by dipping Si-H surfaces into dilute solutions of organic molecules or proteins comprising disulfide bonds. We demonstrate that S-S bonds can be spontaneously reduced on Si-H, forming covalent Si-S bonds in the presence of traces of water, and that this grafting can be catalyzed by electrochemical potential. Cyclic disulfide can be spontaneously reduced to form complete monolayers in 1 h, and the reduction can be catalyzed electrochemically to form full surface coverages within 15 min. In contrast, the kinetics of SAM formation of the cyclic disulfide molecule on Au was found to be three-fold slower than that on Si. It is also demonstrated that dilute thiol solutions can form monolayers on Si-H following oxidation to disulfides under ambient conditions; the supply of too much oxygen, however, inhibits SAM formation. The electron transfer kinetics of the Si-S-enabled SAMs on Si-H is comparable to that on Au, suggesting that Si-S contacts are electrically transmissive. We further demonstrate the prospect of this spontaneous disulfide reduction by forming a monolayer of protein azurin on a Si-H surface within 1 h. The direct reduction of disulfides on Si electrodes presents new capabilities for a range of fields, including molecular electronics, for which highly conducting SAM-electrode contacts are necessary and for emerging fields such as biomolecular electronics as disulfide linkages could be exploited to wire proteins between Si electrodes, within the context of the current Si-based technologies.
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Affiliation(s)
- Essam M Dief
- School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia
| | - Yan B Vogel
- School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia
| | - Chandramalika R Peiris
- School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia
| | - Anton P Le Brun
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization (ANSTO), Lucas Heights, New South Wales 2234, Australia
| | - Vinicius R Gonçales
- School of Chemistry, Australia Centre for NanoMedicine, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Simone Ciampi
- School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia
| | - Jeffrey R Reimers
- International Centre for Quantum and Molecular Structures, School of Physics, Shanghai University, Shanghai 200444, China
- School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Nadim Darwish
- School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces, Curtin University, Bentley, Western Australia 6102, Australia
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Ma T, Martens I, Bizzotto D. Thermal Stability of Thiolated DNA SAMs in Buffer: Revealing the Influence of Surface Crystallography and DNA Coverage via In Situ Combinatorial Surface Analysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:14495-14506. [PMID: 33231463 DOI: 10.1021/acs.langmuir.0c01828] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The thermal stability of thiol based DNA SAMs prepared on gold surfaces is an important parameter that is correlated to sensor lifetime. The thermal stability of DNA SAMs was evaluated in aqueous buffer through the use of fluorophore labeled DNA, a single crystal gold bead electrode, and microscopy. The stability of different crystallographic regions on the electrode was studied for thermal treatments up to 95 °C for 90 min. Using a in situ combinatorial surface analytical measurement showed that the crystallography of the underlying gold surface played a significant role, with the square or rectangular lattices (e.g., 110, 100, 210) having the highest stability. Surfaces with hexagonal lattices (e.g., 111, 311, 211) were less stable toward thermal treatments. These crystallographic trends were observed for both high and low coverage DNA SAMs. High coverage DNA SAMs were the most stable, with stability decreasing with decreasing coverage on average. Increasing DNA SAM coverage appears to slow the kinetics of thermal desorption, but the coordination to the underlying surface determined their relative stability. Preparing the DNA SAMs under nominally similar conditions were found to create surfaces that were similar at room temperature, but had significantly different thermal stability. Optimal DNA sensing with these surfaces most often requires low coverage DNA SAMs which results in poor thermal stability, which is predictive of a poor shelf life, making optimization of both parameters challenging. Furthermore, the crystallographically specific results should be taken into account when studying the typically used polycrystalline substrates since the underlying surface crystallography maybe different for different samples. It appears that preparing DNA SAMs with low coverage and significant thermal stability will be challenging using the current SAM preparation procedures.
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Affiliation(s)
- Tianxiao Ma
- Advanced Materials and Process Engineering Laboratory (AMPEL), University of British Columbia, Vancouver V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Isaac Martens
- Advanced Materials and Process Engineering Laboratory (AMPEL), University of British Columbia, Vancouver V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Dan Bizzotto
- Advanced Materials and Process Engineering Laboratory (AMPEL), University of British Columbia, Vancouver V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, Vancouver V6T 1Z4, Canada
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Reflection Absorption Infrared Spectroscopy Characterization of SAM Formation from 8-Mercapto- N-(phenethyl)octanamide Thiols with Phe Ring and Amide Groups. Molecules 2020; 25:molecules25235633. [PMID: 33265984 PMCID: PMC7730404 DOI: 10.3390/molecules25235633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/20/2020] [Accepted: 11/27/2020] [Indexed: 11/17/2022] Open
Abstract
Multifunctional amide-containing self-assembled monolayers (SAMs) provide prospects for the construction of interfaces with required physicochemical properties and distinctive stability. In this study, we report the synthesis of amide-containing thiols with terminal phenylalanine (Phe) ring functionality (HS(CH2)7CONH(CH2)2C6H5) and the characterization of the formation of SAMs from these thiols on gold by reflection absorption infrared spectroscopy (RAIRS). For reliable assignments of vibrational bands, ring deuterated analogs were synthesized and studied as well. Adsorption time induced changes in Amide-II band frequency and relative intensity of Amide-II/Amide-I bands revealed two-state sigmoidal form dependence with a transition inflection points at 2.2 ± 0.5 and 4.7 ± 0.5 min, respectively. The transition from initial (disordered) to final (hydrogen-bonded, ordered) structure resulted in increased Amide-II frequency from 1548 to 1557 cm-1, which is diagnostic for a strongly hydrogen-bonded amide network in trans conformation. However, the lateral interactions between the alkyl chains were found to be somewhat reduced when compared with well-ordered alkane thiol monolayers.
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Correa‐Ascencio M, Galván‐Miranda EK, García‐Montalvo V, Cao R, Cea‐Olivares R, Jiménez‐Sandoval O, Vera‐Estrada IL. 4,5‐Bis(diphenylthiophosphinoyl)‐1,2,3‐triazolate interaction with gold nanoparticles and flat surfaces to form self‐assembled monolayers. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marisol Correa‐Ascencio
- Instituto de Química Universidad Nacional Autónoma de México Circuito Exterior, Ciudad Universitaria Ciudad de México CdMx 04510 México
| | - Elizabeth K. Galván‐Miranda
- Instituto de Química Universidad Nacional Autónoma de México Circuito Exterior, Ciudad Universitaria Ciudad de México CdMx 04510 México
| | - Verónica García‐Montalvo
- Instituto de Química Universidad Nacional Autónoma de México Circuito Exterior, Ciudad Universitaria Ciudad de México CdMx 04510 México
| | - Roberto Cao
- Facultad de Química Universidad de La Habana Zapata s/n Vedado La Habana 10400 Cuba
| | - Raymundo Cea‐Olivares
- Instituto de Química Universidad Nacional Autónoma de México Circuito Exterior, Ciudad Universitaria Ciudad de México CdMx 04510 México
| | - Omar Jiménez‐Sandoval
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Libramiento Norponiente #2000, Fracc. Real de Juriquilla Querétaro Querétaro 76230 Mexico
| | - Irma Lucía Vera‐Estrada
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Libramiento Norponiente #2000, Fracc. Real de Juriquilla Querétaro Querétaro 76230 Mexico
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46
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The Potential of X-ray Photoelectron Spectroscopy for Determining Interface Dipoles of Self-Assembled Monolayers. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10175735] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the current manuscript we assess to what extent X-ray photoelectron spectroscopy (XPS) is a suitable tool for probing the dipoles formed at interfaces between self-assembled monolayers and metal substrates. To that aim, we perform dispersion-corrected, slab-type band-structure calculations on a number of biphenyl-based systems bonded to an Au(111) surface via different docking groups. In addition to changing the docking chemistry (and the associated interface dipoles), the impacts of polar tail group substituents and varying dipole densities are also investigated. We find that for densely packed monolayers the shifts of the peak positions of the simulated XP spectra are a direct measure for the interface dipoles. In the absence of polar tail group substituents they also directly correlate with adsorption-induced work function changes. At reduced dipole densities this correlation deteriorates, as work function measurements probe the difference between the Fermi level of the substrate and the electrostatic energy far above the interface, while core level shifts are determined by the local electrostatic energy in the region of the atom from which the photoelectron is excited.
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47
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Wu X, Wiame F, Maurice V, Marcus P. Moiré Structure of the 2-Mercaptobenzothiazole Corrosion Inhibitor Adsorbed on a (111)-Oriented Copper Surface. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:15995-16001. [PMID: 32742539 PMCID: PMC7385852 DOI: 10.1021/acs.jpcc.0c04083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/22/2020] [Indexed: 06/11/2023]
Abstract
The adsorption of 2-mercaptobenzothiazole (2-MBT) vapor on a Cu(111) surface under ultra-low pressure was investigated. For an exposure of 45 L at 150 °C, a Moiré pattern was observed as a result of the superposition of an underlying R30° structure and an outer layer compressed by 18% and rotated by 1.2°. The Moiré pattern was rich in S bonded to Cu as a result of molecular decomposition and partial desorption and was transformed to a R19.1° structure when the sample temperature was increased above 250 °C during deposition. This pre-adsorbed Moiré structure led to the sharp decrease of the oxidation kinetics, which better protects copper against corrosion than the non-ordered 2-MBT monolayer formed at room temperature. Upon further exposure to 2-MBT at room temperature, an equivalent monolayer of the molecule was adsorbed on the Moiré structure at saturation whereas a multilayer was formed for the direct deposition on Cu(111) at room temperature.
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Affiliation(s)
- Xiaocui Wu
- Physical Chemistry of Surfaces Group,
Institut de Recherche de Chimie Paris CNRS
- Chimie ParisTech, Université PSL 75005 Paris, France
| | - Frédéric Wiame
- Physical Chemistry of Surfaces Group,
Institut de Recherche de Chimie Paris CNRS
- Chimie ParisTech, Université PSL 75005 Paris, France
| | - Vincent Maurice
- Physical Chemistry of Surfaces Group,
Institut de Recherche de Chimie Paris CNRS
- Chimie ParisTech, Université PSL 75005 Paris, France
| | - Philippe Marcus
- Physical Chemistry of Surfaces Group,
Institut de Recherche de Chimie Paris CNRS
- Chimie ParisTech, Université PSL 75005 Paris, France
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Noorbakhsh Nezhad AH, Rahimi E, Arefinia R, Davoodi A, Hosseinpour S. Effect of Substrate Grain Size on Structural and Corrosion Properties of Electrodeposited Nickel Layer Protected with Self-Assembled Film of Stearic Acid. MATERIALS 2020; 13:ma13092052. [PMID: 32353987 PMCID: PMC7254410 DOI: 10.3390/ma13092052] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/23/2020] [Accepted: 04/26/2020] [Indexed: 12/29/2022]
Abstract
In the present study, the impact of copper substrate grain size on the structure of the succeeding electrodeposited nickel film and its consequent corrosion resistance in 3.5% NaCl medium were evaluated before and after functionalization with stearic acid. Nickel layers were electrodeposited on two different copper sheets with average grain size of 12 and 25 µm, followed by deposition of stearic acid film through self-assembly. X-ray diffraction analysis of the electrodeposited nickel films revealed that the deposition of nickel film on the Cu substrate with small (12 µm) and large (25 µm) grains is predominantly governed by growth in the (220) and (111) planes, respectively. Both electrodeposited films initially exhibited a hydrophilic nature, with water-contact angles of 56° and <10°, respectively. After functionalization with stearic acid, superhydrophobic films with contact angles of ~150° were obtained on both samples. In a 3.5% NaCl medium, the corrosion resistance of the nickel layer electrodeposited on the copper substrate with 25 µm grains was three times greater than that deposited on the copper substrate with 12 µm grains. After functionalization, the corrosion resistance of both films was greatly improved in both short and long immersion times in 3.5% NaCl medium.
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Affiliation(s)
- Amir Hossein Noorbakhsh Nezhad
- Materials and Metallurgical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad (FUM), Mashhad 9177948974, Iran
| | - Ehsan Rahimi
- Department of Engineering and Architecture, University of Udine, Via Cotonificio 108, 33100 Udine, Italy
| | - Reza Arefinia
- Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad (FUM), Mashhad 9177948974, Iran
| | - Ali Davoodi
- Materials and Metallurgical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad (FUM), Mashhad 9177948974, Iran
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Correspondence: (A.D.); (S.H.)
| | - Saman Hosseinpour
- Institute of Particle Technology (LFG), Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Cauerstrasse 4, 91058 Erlangen, Germany
- Correspondence: (A.D.); (S.H.)
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Zhou G, Liu C, Bumm LA, Huang L. Force Field Parameter Development for the Thiolate/Defective Au(111) Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4098-4107. [PMID: 32200638 DOI: 10.1021/acs.langmuir.0c00530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A molecular-level understanding of the interplay between self-assembled monolayers (SAMs) of thiolates and gold surface is of great importance to a wide range of applications in surface science and nanotechnology. Despite theoretical research progress of the past decade, an atomistic model, capable of describing key features of SAMs at reconstructed gold surfaces, is still missing. In this work, periodic ab initio density functional theory (DFT) calculations were utilized to develop a new atomistic force field model for alkanethiolate (AT) SAMs on a reconstructed Au(111) surface. The new force field parameters were carefully trained to reproduce the key features, including vibrational spectra and torsion energy profiles of ethylthiolate (C2S) in the bridge or staple motif model on the Au(111) surface, wherein, the force constants of the bond and angle terms were trained by matching the vibrational spectra, while the torsion parameters of the dihedral angles were trained via fitting the torsion energy profiles from DFT calculations. To validate the developed force field parameters, we performed classical molecular dynamics (MD) simulations for both pristine and reconstructed Au-S interface models with a (2√3 × 3) unit cell, which includes four dodecanethiolate (C10S) molecules on the Au(111) surface. The simulation results showed that the geometrical features of the investigated Au-S interface models and structural properties of the C10S SAMs are in good agreement with the ab initio MD studies. The newly developed atomistic force field model provides new fundamental insights into AT SAMs on the reconstructed Au(111) surface and adds advancement to the existing interface research knowledge.
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Affiliation(s)
- Guobing Zhou
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Chang Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
| | - Lloyd A Bumm
- Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Liangliang Huang
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
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50
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Shepherd JL, Clément J, McGillivary L. Friction titration measurements of electrochemically generated mixed alkylthiol monolayers on polycrystalline gold. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.135937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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