1
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Kim HJ, Nayak BP, Zhang H, Ocko BM, Travesset A, Vaknin D, Mallapragada SK, Wang W. Two-dimensional assembly of gold nanoparticles grafted with charged-end-group polymers. J Colloid Interface Sci 2023; 650:1941-1948. [PMID: 37517193 DOI: 10.1016/j.jcis.2023.07.095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 07/12/2023] [Accepted: 07/14/2023] [Indexed: 08/01/2023]
Abstract
HYPOTHESIS Introducing charged terminal groups to polymers that graft nanoparticles enable Coulombic control over their assembly by tuning the pH and salinity of their aqueous suspensions. EXPERIMENTS Gold nanoparticles (AuNPs) are grafted with poly (ethylene glycol) (PEG) terminated with (charge-neutral), (negatively charged) or groups (positively charged), and characterized with dynamic light scattering, ζ-potential, and thermal gravimetric analysis. Liquid surface X-ray reflectivity (XR) and grazing incidence small-angle X-ray scattering (GISAXS) are used to determine the density profile and in-plane structure of the AuNPs assembly at the aqueous surface. FINDINGS Assembly of PEG-AuNPs at the liquid/vapor interface is tunable by adjusting pH or salinity for COOH but less for terminals. The distinct assembly behaviors are attributed to the overall charge of PEG-AuNPs as well as PEG conformation. COOH-PEG corona is more compact than those of the other terminal groups, leading to a crystalline structure with a smaller superlattice. The net charge per particle depends not only on the PEG terminal groups but also on the cation sequestration of PEG and the intrinsic negative charge of the AuNP surface. [1] The closeness to overall charge neutrality, and hydrogen bonding in play, brought by -PEG, drive -PEG-AuNPs to assembly and crystallinity without additives to the suspensions.
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Affiliation(s)
- Hyeong Jin Kim
- Ames National Laboratory, and Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, United States
| | - Binay P Nayak
- Ames National Laboratory, and Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, United States
| | - Honghu Zhang
- Center for Functional Nanomaterials and NSLS-II, Brookhaven National Laboratory, Upton, NY 11973, United States
| | - Benjamin M Ocko
- NSLS-II, Brookhaven National Laboratory, Upton, NY 11973, United States
| | - Alex Travesset
- Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States
| | - David Vaknin
- Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States
| | - Surya K Mallapragada
- Ames National Laboratory, and Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, United States.
| | - Wenjie Wang
- Division of Materials Sciences and Engineering, Ames National Laboratory, U.S. DOE, Ames, IA 50011, United States.
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2
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Nakayama M, Kajimoto K, Misaka T, Mishima N, Yamada T, Ohoyama H, Matsumoto T. Probing Energy-Level Alignment in Molecular Multilayers by Frequency-Modulation Electrostatic Force Microscopy under Tapping-Mode-Combined Fowler-Nordheim Tunneling Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2023; 15:47704-47714. [PMID: 37751421 PMCID: PMC10573325 DOI: 10.1021/acsami.3c08553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 08/17/2023] [Indexed: 09/28/2023]
Abstract
The alignment of molecular electronic levels in a molecular multilayer is of crucial importance to realize desired functions for molecular devices. Amplitude-modulation-feedback frequency-modulation electrostatic force microscopy combined with Fowler-Nordheim tunneling spectroscopy is utilized as a probe for the energy-level alignment in an organic multilayer. Bias-dependent electrostatic force spectra were examined for bilayers including a Ru complex as a benchmark multilayer system. Electrostatic properties in the low-bias region were captured well by a single-capacitor model, which indicates weak coupling at the bilayer interface between the Ru complex and self-assembled monolayer. In contrast, in the high-bias region, significant disagreement with the expected electrostatic force was recognized for the bilayers and evaluated as the loss of electrostatic energy through the Fowler-Nordheim tunneling process. Alignment of the lowest unoccupied molecular orbital (LUMO) level of the Ru complex was determined by Fowler-Nordheim emission through resonant tunneling. These results indicate an effective method to probe level alignment at interfaces inside multilayers and to provide the partition factor β that depicts a divided electric field.
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Affiliation(s)
- Masahiro Nakayama
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Kentaro Kajimoto
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Tomoki Misaka
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Naoya Mishima
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Takashi Yamada
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Hiroshi Ohoyama
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Takuya Matsumoto
- Department of Chemistry,
Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
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3
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Pabi B, Marek Š, Pal A, Kumari P, Ray SJ, Thakur A, Korytár R, Pal AN. Resonant transport in a highly conducting single molecular junction via metal-metal covalent bond. NANOSCALE 2023; 15:12995-13008. [PMID: 37483089 DOI: 10.1039/d3nr02585c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Achieving highly transmitting molecular junctions through resonant transport at low bias is key to the next-generation low-power molecular devices. Although resonant transport in molecular junctions was observed by connecting a molecule between the metal electrodes via chemical anchors by applying a high source-drain bias (>1 V), the conductance was limited to <0.1G0, G0 being the quantum of conductance. Herein, we report electronic transport measurements by directly connecting a ferrocene molecule between Au electrodes under ambient conditions in a mechanically controllable break junction setup (MCBJ), revealing a conductance peak at ∼0.2G0 in the conductance histogram. A similar experiment was repeated for ferrocene terminated with amine (-NH2) and cyano (-CN) anchors, where conductance histograms exhibit an extended low conductance feature, including the sharp high conductance peak, similar to pristine ferrocene. The statistical analysis of the data and density functional theory-based transport calculation suggest a possible molecular conformation with a strong hybridization between the Au electrodes, and that the Fe atom of ferrocene is responsible for a near-perfect transmission in the vicinity of the Fermi energy, leading to the resonant transport at a small applied bias (<0.5 V). Moreover, calculations including van der Waals/dispersion corrections reveal a covalent-like organometallic bonding between Au and the central Fe atom of ferrocene, having bond energies of ∼660 meV. Overall, our study not only demonstrates the realization of an air-stable highly transmitting molecular junction, but also provides important insights about the nature of chemical bonding at the metal/organo-metallic interface.
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Affiliation(s)
- Biswajit Pabi
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Sector III, Block JD, Salt Lake, Kolkata 700106, India.
| | - Štepán Marek
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 121 16, Prague 2, Czech Republic
| | - Adwitiya Pal
- Department of Chemistry, Jadavpur University, Kolkata-700032, India
| | - Puja Kumari
- Department of Physics, Indian Institute of Technology Patna, Bihar-801106, India
| | - Soumya Jyoti Ray
- Department of Physics, Indian Institute of Technology Patna, Bihar-801106, India
| | - Arunabha Thakur
- Department of Chemistry, Jadavpur University, Kolkata-700032, India
| | - Richard Korytár
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 121 16, Prague 2, Czech Republic
| | - Atindra Nath Pal
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Sector III, Block JD, Salt Lake, Kolkata 700106, India.
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4
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Zhou P, Qiao X, Milan DC, Higgins SJ, Vezzoli A, Nichols RJ. Enhanced charge transport across molecule-nanoparticle-molecule sandwiches. Phys Chem Chem Phys 2023; 25:7176-7183. [PMID: 36810584 DOI: 10.1039/d2cp05525b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
The electrical properties of large area molecular devices consisting of gold nanoparticles (GNPs) sandwiched between a double layer of alkanedithiol linkers have been examined. These devices have been fabricated by a facile bottom-up assembly in which an alkanedithiol monolayer is first self-assembled on an underlying gold substrate followed by nanoparticle adsorption and then finally assembly of the top alkanedithiol layer. These devices are then sandwiched between the bottom gold substrates and a top eGaIn probe contact and current-voltage (I-V) curves recorded. Devices have been fabricated with 1,5-pentanedithiol, 1,6-hexanedithiol, 1,8-octanedithiol and 1,10-decanedithiol linkers. In all cases the electrical conductance of the double SAM junctions with GNPs is higher than the corresponding and much thinner single alkanedithiol SAM. Competing models for this enhanced conductance are discussed and it is suggested to have a topological origin arising from how the devices assemble or structure during the fabrication, which gives more efficient cross device electron transport pathways without the GNPs producing short circuits.
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Affiliation(s)
- P Zhou
- Yangzhou Polytechnic Institute, No. 199, Huayang West Road, Yangzhou City, Jiangsu Province, China.,Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK.
| | - X Qiao
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK.
| | - D C Milan
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK.
| | - S J Higgins
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK.
| | - A Vezzoli
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK.
| | - R J Nichols
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK.
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5
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Li HB, Xi YF, Hong ZW, Yu J, Li XX, Liu WX, Domulevicz L, Jin S, Zhou XS, Hihath J. Temperature-Dependent Tunneling in Furan Oligomer Single-Molecule Junctions. ACS Sens 2021; 6:565-572. [PMID: 33529001 DOI: 10.1021/acssensors.0c02278] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two commonly observed charge transport mechanisms in single-molecule junctions are coherent tunneling and incoherent hopping. It has been generally believed that tunneling processes yield temperature-independent conductance behavior and hopping processes exhibit increasing conductance with increasing temperature. However, it has recently been proposed that tunneling can also yield temperature-dependent transport due to the thermal broadening of the Fermi energy of the contacts. In this work, we examine a series of rigid, planar furan oligomers that are free from a rotational internal degree of freedom to examine the temperature dependence of tunneling transport directly over a wide temperature range (78-300 K). Our results demonstrate conductance transition from a temperature-independent regime to a temperature-dependent regime. By examining various hopping and tunneling models and the correlation between the temperature dependence of conductance and molecular orbital energy offset from the Fermi level, we conclude thermally assisted tunneling is the dominant cause for the onset of temperature-dependent conductance in these systems.
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Affiliation(s)
- Haipeng B. Li
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
- Department of Electrical and Computer Engineering, University of California Davis, Davis, California 95616, United States
| | - Yan-Feng Xi
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Ze-Wen Hong
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
| | - Jingxian Yu
- ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP), Institute for Photonics and Advanced Sensing, Department of Chemistry, The University of Adelaide, Adelaide SA 5005, Australia
| | - Xiao-Xia Li
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Wen-Xia Liu
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Lucas Domulevicz
- Department of Electrical and Computer Engineering, University of California Davis, Davis, California 95616, United States
| | - Shan Jin
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Xiao-Shun Zhou
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
| | - Joshua Hihath
- Department of Electrical and Computer Engineering, University of California Davis, Davis, California 95616, United States
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6
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Li X, Guo Y, Cao H. Nanostructured surfaces from ligand-protected metal nanoparticles. Dalton Trans 2020; 49:14314-14319. [PMID: 33043928 DOI: 10.1039/d0dt02822c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Nanostructuring surfaces with metal atoms or clusters represents a promising approach to create materials with unique electronic/magnetic properties and improved chemical reactivity. By means of plasma sputtering and mass spectrometric techniques, the deposition of precisely size-selected clusters onto single-crystal surfaces has been applied to prepare surfaces with tailored properties. However, nanostructured surfaces can as well be prepared with metal nanoparticles via solution-phase methods, but the difference is that nanoparticles prepared by wet chemistry are usually coated with a layer of ligands, which are essential not only for maintaining the size and the atomic structure of metallic cores, but also for playing crucial roles in the synthesis, physicochemical properties and catalytic activities of the nanoparticles. This Frontier covers aspects of nanostructured surfaces from ligand-protected metal nanoparticles, starting with high-resolution imaging of the ligand-protected metal nanoparticles, followed by periodic patterning of metal nanoparticles on surfaces and the well-controlled atomic layer deposition with nanoclusters at the liquid/solid interface. We also highlight the potential of the surface-supported structures from ligand-protected metal nanoparticles, and the challenges remaining to be tackled.
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Affiliation(s)
- Xin Li
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
| | - Yiming Guo
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
| | - Hai Cao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
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7
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Siddiqui MA, Wahab R, Ahmad J, Farshori NN, Al-Khedhairy AA. Single and Multi-metal Oxide Nanoparticles Induced Cytotoxicity and ROS Generation in Human Breast Cancer (MCF-7) Cells. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01564-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Gunasekaran S, Reed DA, Paley DW, Bartholomew AK, Venkataraman L, Steigerwald ML, Roy X, Nuckolls C. Single-Electron Currents in Designer Single-Cluster Devices. J Am Chem Soc 2020; 142:14924-14932. [PMID: 32809814 DOI: 10.1021/jacs.0c04970] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Atomically precise clusters can be used to create single-electron devices wherein a single redox-active cluster is connected to two macroscopic electrodes via anchoring ligands. Unlike single-electron devices comprising nanocrystals, these cluster-based devices can be fabricated with atomic precision. This affords an unprecedented level of control over the device properties. Herein, we design a series of cobalt chalcogenide clusters with varying ligand geometries and core nuclearities to control their current-voltage (I-V) characteristics in a scanning tunneling microscope-based break junction (STM-BJ) device. First, the device geometry is modified by precisely positioning junction-anchoring ligands on the surface of the cluster. We show that the I-V characteristics are independent of ligand placement, confirming a sequential, single-electron tunneling mechanism. Next, we chemically fuse two clusters to realize a larger cluster dimer that behaves as a single electronic unit, possessing a smaller reorganization energy and more accessible redox states than the monomeric analogues. As a result, dimer-based devices exhibit significantly higher currents and can even be pushed to current saturation at high bias. Owing to these controllable properties, single-cluster junctions serve as an excellent platform for exploring incoherent charge transport processes at the nanoscale. With this understanding, as well as properties such as nonlinear I-V characteristics and rectification, these molecular clusters may function as conductive inorganic nodes in new devices and materials.
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Affiliation(s)
- Suman Gunasekaran
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Douglas A Reed
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Daniel W Paley
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | | | - Latha Venkataraman
- Department of Chemistry, Columbia University, New York, New York 10027, United States.,Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | - Michael L Steigerwald
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Colin Nuckolls
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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9
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Wakizaka M, Atqa A, Chun WJ, Imaoka T, Yamamoto K. Subnano-transformation of molybdenum carbide to oxycarbide. NANOSCALE 2020; 12:15814-15822. [PMID: 32691809 DOI: 10.1039/d0nr04495d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ultrasmall particles exhibit structures and/or properties that are different from those of the corresponding bulk materials; in this context especially ultrasmall precious-metal particles have been extensively investigated. In this study, we targeted the transition base-metal Mo and succeeded in systematically producing Mo oxycarbide/carbide particles with diameters of 1.7 ± 0.7, 1.4 ± 0.5, 1.3 ± 0.4, 1.2 ± 0.3, 1.0 ± 0.3, and 0.8 ± 0.2 nm on a carbon support using the carbothermal hydrogen reduction method at 773 K and a diphenylazomethine-type dendrimer as a template. The formation and properties of the particles were confirmed using X-ray photoelectron spectroscopy, high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images, and X-ray absorption fine structure (XAFS) studies. We found that Mo particles with a diameter of 1.3 nm or greater formed carbides such as β'-Mo2C, whereas smaller particles formed oxycarbides, indicating a size-dependent transformation in the phase or composition of the particles. Thus, this work demonstrated a new concept, subnano-transformation, which would be a new class of phase transformation based on the concept of the size dependence in such an ultrasmall scale. In addition, the movement of Mo atoms within a cluster and on the fringes of a nanoparticle was also demonstrated during continuous time-course high-resolution HAADF-STEM observation.
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Affiliation(s)
- Masanori Wakizaka
- Laboratory for Chemistry and Life Science Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan.
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10
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Dey K, Kunjattu H. S, Chahande AM, Banerjee R. Nanoparticle Size‐Fractionation through Self‐Standing Porous Covalent Organic Framework Films. Angew Chem Int Ed Engl 2019; 59:1161-1165. [DOI: 10.1002/anie.201912381] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Kaushik Dey
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur Campus Mohanpur 741246 India
| | - Shebeeb Kunjattu H.
- Polymer Science and Engineering Division CSIR National Chemical Laboratory Dr. Homi Bhabha Road Pune 411008 India
| | - Anurag M. Chahande
- Catalysis and Inorganic Chemistry Division CSIR National Chemical Laboratory Dr. Homi Bhabha Road Pune 411008 India
| | - Rahul Banerjee
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur Campus Mohanpur 741246 India
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11
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Dey K, Kunjattu H. S, Chahande AM, Banerjee R. Nanoparticle Size‐Fractionation through Self‐Standing Porous Covalent Organic Framework Films. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912381] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kaushik Dey
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur Campus Mohanpur 741246 India
| | - Shebeeb Kunjattu H.
- Polymer Science and Engineering Division CSIR National Chemical Laboratory Dr. Homi Bhabha Road Pune 411008 India
| | - Anurag M. Chahande
- Catalysis and Inorganic Chemistry Division CSIR National Chemical Laboratory Dr. Homi Bhabha Road Pune 411008 India
| | - Rahul Banerjee
- Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur Campus Mohanpur 741246 India
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12
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Abstract
In recent years, various reports related to sensing application research have suggested that combining the synergistic impacts of optical, electrical or magnetic properties in a single technique can lead to a new multitasking platform. Owing to their unique features of the magnetic moment, biocompatibility, ease of surface modification, chemical stability, high surface area, high mass transference, magnetic nanoparticles have found a wide range of applications in various fields, especially in sensing systems. The present review is comprehensive information about magnetic nanoparticles utilized in the optical sensing platform, broadly categorized into four types: surface plasmon resonance (SPR), surface-enhanced Raman spectroscopy (SERS), fluorescence spectroscopy and near-infrared spectroscopy and imaging (NIRS) that are commonly used in various (bio) analytical applications. The review also includes some conclusions on the state of the art in this field and future aspects.
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13
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Abstract
The basic theoretical understanding of light interacting with nanostructured metals that has existed since the early 1900s has become more relevant in the last two decades, largely because of new approaches to structure metals down to the nanometer scale or smaller. Here, a broad overview of the concepts and applications of nanostructuring metals for light-based technologies is given. The theory of the response of metals to an applied oscillating field is given, including a discussion of nonlocal, nonlinear and quantum effects. Using this metal response, the guiding of electromagnetic (light) waves using metals is given, with a particular emphasis on the impact of nanostructured metals for tighter confinement and slower propagation. Similarly, the influence of metal nanostructures on light scattering by isolated metal structures, like nanoparticles and nanoantennas, is described, with basic results presented including plasmonic/circuit resonances, the single channel limit, directivity enhancement, the maximum power transfer theorem, limits on the magnetic response from kinetic inductance and the scaling of gap plasmons to the nanometer scale and smaller. A brief overview of nanofabrication approaches to creating metal nanostructures is given. Finally, existing and emerging light-based applications are presented, including those for sensing, spectroscopy (including local refractive index, Raman, IR absorption), detection (including Schottky detectors), switching (including terahertz photoconductive antennas), modulation, energy harvesting and photocatalysis, light emission (including lasers and tunneling based light emission), optical tweezing, nonlinear optics, subwavelength imaging and lithography and high density data storage.
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14
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Bai F, Bian K, Huang X, Wang Z, Fan H. Pressure Induced Nanoparticle Phase Behavior, Property, and Applications. Chem Rev 2019; 119:7673-7717. [PMID: 31059242 DOI: 10.1021/acs.chemrev.9b00023] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Nanoparticle (NP) high pressure behavior has been extensively studied over the years. In this review, we summarize recent progress on the studies of pressure induced NP phase behavior, property, and applications. This review starts with a brief overview of high pressure characterization techniques, coupled with synchrotron X-ray scattering, Raman, fluorescence, and absorption. Then, we survey the pressure induced phase transition of NP atomic crystal structure including size dependent phase transition, amorphization, and threshold pressures using several typical NP material systems as examples. Next, we discuss the pressure induced phase transition of NP mesoscale structures including topics on pressure induced interparticle separation distance, NP coupling, and NP coalescence. Pressure induced new properties and applications in different NP systems are highlighted. Finally, outlooks with future directions are discussed.
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Affiliation(s)
- Feng Bai
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China
| | - Kaifu Bian
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Xin Huang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Zhongwu Wang
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
| | - Hongyou Fan
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States.,Department of Chemical and Biological Engineering, Albuquerque, University of New Mexico, Albuquerque, New Mexico 87106, United States.,Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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15
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Benini L, Mukherjee A, Chakrabarti A, Römer RA. Spin-polarized localization in a magnetized chain. Sci Rep 2019; 9:5930. [PMID: 30976024 PMCID: PMC6459837 DOI: 10.1038/s41598-019-42316-5] [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: 12/18/2018] [Accepted: 03/27/2019] [Indexed: 11/09/2022] Open
Abstract
We investigate a simple tight-binding Hamiltonian to understand the stability of spin-polarized transport of states with an arbitrary spin content in the presence of disorder. The general spin state is made to pass through a linear chain of magnetic atoms, and the localization lengths are computed. Depending on the value of spin, the chain of magnetic atoms unravels a hidden transverse dimensionality that can be exploited to engineer energy regimes where only a selected spin state is allowed to retain large localization lengths. We carry out a numerical anmalysis to understand the roles played by the spin projections in different energy regimes of the spectrum. For this purpose, we introduce a new measure, dubbed spin-resolved localization length. We study uncorrelated disorder in the potential profile offered by the magnetic substrate or in the orientations of the magnetic moments concerning a given direction in space. Our results show that the spin filtering effect is robust against weak disorder and hence the proposed system should be a good candidate model for experimental realizations of spin-selective transport devices.
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Affiliation(s)
- Leonardo Benini
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
| | - Amrita Mukherjee
- Department of Physics, University of Kalyani, Kalyani, West Bengal, 741 235, India
| | - Arunava Chakrabarti
- Department of Physics, University of Kalyani, Kalyani, West Bengal, 741 235, India.,Department of Physics, Presidency University, 86/1, College Street, Kolkata, 700073, West Bengal, India
| | - Rudolf A Römer
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
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16
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Vishwanathan K, Springborg M. Retracted Article: A highest stable cluster Au 58 ( C 1) re-optimized via a density-functional tight-binding (DFTB) approach. RSC Adv 2018; 8:11357-11366. [PMID: 35542769 PMCID: PMC9079119 DOI: 10.1039/c7ra13171b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 02/26/2018] [Indexed: 11/21/2022] Open
Abstract
The vibrational spectrum ω i of a re-optimized neutral gold cluster Au58 has been calculated using a numerical finite-difference approach and the density-functional tight-binding (DFTB) method. We have exactly predicted the vibrational frequency ranging from 3.88 through to 304.49 cm-1 which depends on the size and the arrangement of the atoms in the nanoparticle morphology of the cluster at ΔE = 0. Our investigation has revealed that the vibrational spectrum is strongly influenced by size and structure. It is well known that gold atomic clusters can have planar or hollow cage-like structures due to their relativistic effect. However, in our study, by first principles calculations on a Au58 cluster we have proposed that gold clusters of medium size can form a shell-like structure (skeleton/helmet), this is demonstrated by the remarkable robustness of a double shell structure with a hollow inner shell of about ten atoms. Finally, the structure symmetry (C 1) is confirmed through the cluster size, vibrational spectroscopy, and by studying the effect of temperature on a neutral gold cluster for the first time.
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Affiliation(s)
- K Vishwanathan
- Physical and Theoretical Chemistry, University of Saarland 66123 Saarbrücken Germany +49-0151-63119680
| | - M Springborg
- Physical and Theoretical Chemistry, University of Saarland 66123 Saarbrücken Germany +49-0151-63119680
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17
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Pensa E, Albrecht T. Controlling the Dynamic Instability of Capped Metal Nanoparticles on Metallic Surfaces. J Phys Chem Lett 2018; 9:57-62. [PMID: 29232520 DOI: 10.1021/acs.jpclett.7b02994] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Small metal nanoparticles (NPs) with core-sizes ranging from 1 to 3 nm constitute a bridge between molecules and colloids with unique electronic, catalytic, and other properties. Many applications entail immobilization onto solid supports, but while NP behavior in solution is well studied, the effect of the interaction between NPs and the substrate surface is understood less. Here, we follow the structural evolution of thiolated monolayer-protected AuNPs on Au(111) substrates at the single-particle level in real-time using high-resolution in situ scanning tunneling microscopy. We show how the reactivity of the substrate affects the stability of the immobilized NPs and how their structural identity can be preserved. Entropically driven redistribution of the NP's protective capping layer is an important element in the disintegration process and at the same time rather generic. Our findings may thus have wider implications on the design and optimization of functional surfaces involving NPs, made of materials other than Au.
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Affiliation(s)
- Evangelina Pensa
- Department of Chemistry, Imperial College London , Exhibition Road, London SW7 2AZ, United Kingdom
| | - Tim Albrecht
- Department of Chemistry, Imperial College London , Exhibition Road, London SW7 2AZ, United Kingdom
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18
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Zhang C, Fu X, Peng Z, Gao J, Xia Y, Zhang J, Luo W, Li H, Wang Y, Zhang D. Phosphine-free synthesis and optical stabilities of composition-tuneable monodisperse ternary PbSe1−xSx alloyed nanocrystals via cation exchange. CrystEngComm 2018. [DOI: 10.1039/c7ce02114c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Composition-tunable monodisperse PbSe1−xSx alloyed NCs were synthesized by employing the cation exchange method, which demonstrated excellent air stability.
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19
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Gu C, Wang H, Sun H, Liao J, Hou S, Guo X. Origin and mechanism analysis of asymmetric current fluctuations in single-molecule junctions. RSC Adv 2018; 8:39408-39413. [PMID: 35558058 PMCID: PMC9090728 DOI: 10.1039/c8ra08508k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 11/20/2018] [Indexed: 12/11/2022] Open
Abstract
The measurements of molecular electronic devices usually suffer from serious noise. Although noise hampers the operation of electric circuits in most cases, current fluctuations in single-molecule junctions are essentially related to their intrinsic quantum effects in the process of electron transport. Noise analysis can reveal and understand these processes from the behavior of current fluctuations. Here, in this study we observe and analyze the faint asymmetric current distribution in single-molecule junctions, in which the asymmetric intensity is highly related to the applied biases. The exploration of high-order moments within bias and temperature dependent measurements, in combination with model Hamiltonian calculations, statistically prove that the asymmetric current distribution originates from the inelastic electron tunneling process. Such results demonstrate a potential noise analysis method based on the fine structures of the current distribution rather than the noise power, which has obvious advantages in the investigation of the inelastic electron tunneling process in single-molecule junctions. The asymmetric current noise in a single-molecule device was observed, which is relevant to an inelastic electron transport process.![]()
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Affiliation(s)
- Chunhui Gu
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Hao Wang
- Key Laboratory for the Physics and Chemistry of Nanodevices
- Department of Electronics
- Peking University
- Beijing 100871
- P. R. China
| | - Hantao Sun
- Key Laboratory for the Physics and Chemistry of Nanodevices
- Department of Electronics
- Peking University
- Beijing 100871
- P. R. China
| | - Jianhui Liao
- Key Laboratory for the Physics and Chemistry of Nanodevices
- Department of Electronics
- Peking University
- Beijing 100871
- P. R. China
| | - Shimin Hou
- Key Laboratory for the Physics and Chemistry of Nanodevices
- Department of Electronics
- Peking University
- Beijing 100871
- P. R. China
| | - Xuefeng Guo
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
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20
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Lovat G, Choi B, Paley DW, Steigerwald ML, Venkataraman L, Roy X. Room-temperature current blockade in atomically defined single-cluster junctions. NATURE NANOTECHNOLOGY 2017; 12:1050-1054. [PMID: 28805817 DOI: 10.1038/nnano.2017.156] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 07/04/2017] [Indexed: 06/07/2023]
Abstract
Fabricating nanoscopic devices capable of manipulating and processing single units of charge is an essential step towards creating functional devices where quantum effects dominate transport characteristics. The archetypal single-electron transistor comprises a small conducting or semiconducting island separated from two metallic reservoirs by insulating barriers. By enabling the transfer of a well-defined number of charge carriers between the island and the reservoirs, such a device may enable discrete single-electron operations. Here, we describe a single-molecule junction comprising a redox-active, atomically precise cobalt chalcogenide cluster wired between two nanoscopic electrodes. We observe current blockade at room temperature in thousands of single-cluster junctions. Below a threshold voltage, charge transfer across the junction is suppressed. The device is turned on when the temporary occupation of the core states by a transiting carrier is energetically enabled, resulting in a sequential tunnelling process and an increase in current by a factor of ∼600. We perform in situ and ex situ cyclic voltammetry as well as density functional theory calculations to unveil a two-step process mediated by an orbital localized on the core of the cluster in which charge carriers reside before tunnelling to the collector reservoir. As the bias window of the junction is opened wide enough to include one of the cluster frontier orbitals, the current blockade is lifted and charge carriers can tunnel sequentially across the junction.
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Affiliation(s)
- Giacomo Lovat
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
| | - Bonnie Choi
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Daniel W Paley
- Department of Chemistry, Columbia University, New York, New York 10027, USA
- Columbia Nano Initiative, Columbia University, New York, New York 10027, USA
| | | | - Latha Venkataraman
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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21
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Correa-Puerta J, Del Campo V, Henríquez R, Esaulov VA, Hamoudi H, Flores M, Häberle P. Unoccupied Interface and Molecular States in Thiol and Dithiol Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12056-12064. [PMID: 28976204 DOI: 10.1021/acs.langmuir.7b02839] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The electronic structure of self-assembled monolayers (SAMs) formed by thiols of different lengths and dithiol molecules bound to Au(111) has been characterized. Inverse photoemission spectroscopy (IPES) and density functional theory have been used to describe the molecule/Au substrate system. All molecular layers display a clear signal in the IPES data at the edge of the lowest unoccupied system orbital (LUSO), roughly 3 eV above the Fermi level. There is also evidence, in both the experimental data and the calculation, of a finite density of states just below the LUSO edge, which has been recognized as localized at the Au-substrate interface. Regardless of the molecular lengths and in addition to this induced density of interface states, an apparent antibonding Au-S state has been identified in the IPES data for both molecular systems. The main difference between the electronic structures of thiol and dithiol SAMs is a shift in the energy of the antibonding state.
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Affiliation(s)
- Jonathan Correa-Puerta
- Instituto de Física, Pontificia Universidad Católica de Valparaíso , 2373223 Valparaíso, Chile
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
| | - Valeria Del Campo
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
| | - Ricardo Henríquez
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
| | - Vladimir A Esaulov
- Institut des Sciences Moléculaires d'Orsay, UMR 8214, CNRS-Université, bât 520, Université Paris-Saclay, Université-Paris Sud , 91405 Orsay, France
| | - Hicham Hamoudi
- Qatar Environment and Energy Research Institute & Qatar College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation , P.O. Box 5825, Doha, Qatar
| | - Marcos Flores
- Departamento de Física, FCFM, Universidad de Chile , 8370415 Santiago, Chile
| | - Patricio Häberle
- Departamento de Física, Universidad Técnica Federico Santa María , Av. España 1680, 2390123 Valparaíso, Chile
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22
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Ranjan P, Chakraborty T, Kumar A. Computational Investigation of Cationic, Anionic and Neutral Ag2AuN (N = 1–7) Nanoalloy Clusters. PHYSICAL SCIENCES REVIEWS 2017. [DOI: 10.1515/psr-2016-0112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe study of bimetallic nanoalloy clusters is of immense importance due to their diverse applications in the field of science and engineering. A deep theoretical insight is required to explain the physico-chemical properties of such compounds. Among such nanoalloy clusters, the compound formed between Ag and Au has received a lot of attention because of their marked electronic, catalytic, optical and magnetic properties. Density Functional Theory (DFT) is one of the most successful approaches of quantum mechanics to study the electronic properties of materials. Conceptual DFT-based descriptors have turned to be indispensable tools for analysing and correlating the experimental properties of compounds. In this report, we have investigated the ground state configurations and physico-chemical properties of Ag2AuNλ(N= 1–7,λ=±1, 0) nanoalloy clusters invoking DFT methodology. Our computed data exhibits interesting odd-even oscillation behaviour. A close agreement between experimental and our computed bond length supports our theoretical analysis.
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23
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Kaur RP, Sawhney RS, Engles D. Electrical characterization of C 28 fullerene junctions formed with group 1B metal electrodes. J Mol Graph Model 2017; 76:296-304. [PMID: 28750306 DOI: 10.1016/j.jmgm.2017.07.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Revised: 07/16/2017] [Accepted: 07/17/2017] [Indexed: 11/15/2022]
Abstract
We present an atomistic theory of electronic transport through single molecular junctions based on smallest stable fullerene molecule, C28. The electronic properties of single molecular junctions critically depend on the nature of electrode material. The two probe device is modeled by constraining C28 between two semi-infinite metal electrodes, from group 1B of periodic table, copper, silver and gold. We have highlighted the correlated phenomena of resonant conduction and current driven dynamics in molecular junctions using extendend Huckel theory in combination with non equilibrium Green's function framework. We conclude strong dependence of conductance on transmissions, which leads to oscillating conductance spectrum. An interesting interplay between conducting channels and different degrees of spatial localization and delocalization of molecular orbitals is evinced. The physical origin of current and conductance of so-formed C28 molecular junctions is discussed in detail by analysing their density of states, transmission spectra, molecular orbital analysis, rectification ratio and molecular projected self consistent Hamiltonian eigen states at different operating voltages ranging from -2V to +2V.
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Affiliation(s)
- Rupan Preet Kaur
- Department of Electronics Technology, Guru Nanak Dev University, Amritsar, India.
| | | | - Derick Engles
- Department of Electronics Technology, Guru Nanak Dev University, Amritsar, India.
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24
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Manepalli RKNR, Madhav BTP, Giridhar G, Srinivasulu M, Tejaswi M, Sivaram K, Jayaprada P, Pisipati VGKM. Characterisation and mesomorphic behaviour of liquid crystals with dispersed PdCl 2 nanoparticles. LIQUID CRYSTALS TODAY 2017. [DOI: 10.1080/1358314x.2017.1313538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | - G. Giridhar
- Department of Nanotechnology, Acharya Nagarjuna University , Guntur, India
| | - M. Srinivasulu
- Department of Chemistry, Manipal Institute of Technology, Manipal University , Manipal, India
| | - M. Tejaswi
- Department of Physics, The Hindu College, Krishna University , Machilipatnam, India
| | - K. Sivaram
- Department of Physics, The Hindu College, Krishna University , Machilipatnam, India
| | - P. Jayaprada
- Department of Physics, The Hindu College, Krishna University , Machilipatnam, India
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25
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Abstract
Tunnel resistance can be modulated with bias via the Coulomb blockade effect, which gives a highly nonlinear response current. Here we investigate the optical response of a metal-insulator-nanoparticle-insulator-metal structure and show switching of a plasmonic gap from insulator to conductor via Coulomb blockade. By introducing a sufficiently large charging energy in the tunnelling gap, the Coulomb blockade allows for a conductor (tunneling) to insulator (capacitor) transition. The tunnelling electrons can be delocalized over the nanocapacitor again when a high energy penalty is added with bias. We demonstrate that this has a huge impact on the plasmonic resonance of a 0.51 nm tunneling gap with ∼70% change in normalized optical loss. Because this structure has a tiny capacitance, there is potential to harness the effect for high-speed switching.
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Affiliation(s)
- Dao Xiang
- Department of Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada
| | - Jian Wu
- Department of Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada
| | - Reuven Gordon
- Department of Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada
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26
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Anderson JSM, Rodríguez JI, Ayers PW, Götz AW. Relativistic (SR-ZORA) quantum theory of atoms in molecules properties. J Comput Chem 2017; 38:81-86. [PMID: 27862042 DOI: 10.1002/jcc.24520] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 09/29/2016] [Accepted: 10/03/2016] [Indexed: 11/07/2022]
Abstract
The Quantum Theory of Atoms in Molecules (QTAIM) is used to elucidate the effects of relativity on chemical systems. To do this, molecules are studied using density-functional theory at both the nonrelativistic level and using the scalar relativistic zeroth-order regular approximation. Relativistic effects on the QTAIM properties and topology of the electron density can be significant for chemical systems with heavy atoms. It is important, therefore, to use the appropriate relativistic treatment of QTAIM (Anderson and Ayers, J. Phys. Chem. 2009, 115, 13001) when treating systems with heavy atoms. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- James S M Anderson
- Computational Materials Science Research Team, AICS, RIKEN,7-1-26 Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan.,iTHES Research Group, RIKEN, 2-1, Hirosawa, Wako-shi, Saitama, 351-0198, Japan
| | - Juan I Rodríguez
- Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Edificio 9, U.P. A.L.M, Col. San Pedro Zacatenco, C.P. 07738, México D.F, México
| | - Paul W Ayers
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada, L8S4M1
| | - Andreas W Götz
- San Diego Supercomputer Center, University of California San Diego, 9500 Gilman Drive, La Jolla, California, 92093-0505
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27
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Yang Z, Li Z, Lu X, He F, Zhu X, Ma Y, He R, Gao F, Ni W, Yi Y. Controllable Biosynthesis and Properties of Gold Nanoplates Using Yeast Extract. NANO-MICRO LETTERS 2017; 9:5. [PMID: 30460302 PMCID: PMC6223771 DOI: 10.1007/s40820-016-0102-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 08/05/2016] [Indexed: 05/22/2023]
Abstract
ABSTRACT Biosynthesis of gold nanostructures has drawn increasing concerns because of its green and sustainable synthetic process. However, biosynthesis of gold nanoplates is still a challenge because of the expensive source and difficulties of controllable formation of morphology and size. Herein, one-pot biosynthesis of gold nanoplates is proposed, in which cheap yeast was extracted as a green precursor. The morphologies and sizes of the gold nanostructures can be controlled via varying the pH value of the biomedium. In acid condition, gold nanoplates with side length from 1300 ± 200 to 300 ± 100 nm and height from 18 to 15 nm were obtained by increasing the pH value. Whereas, in neutral or basic condition, only gold nanoflowers and nanoparticles were obtained. It was determined that organic molecules, such as succinic acid, lactic acid, malic acid, and glutathione, which are generated in metabolism process, played important role in the reduction of gold ions. Besides, it was found that the gold nanoplates exhibited plasmonic property with prominent dipole infrared resonance in near-infrared region, indicating their potential in surface plasmon-enhanced applications, such as bioimaging and photothermal therapy.
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Affiliation(s)
- Zhi Yang
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Zhaohui Li
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Xuxing Lu
- Division of i-Lab, Key Laboratory of Nano-Bio Interface and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123 Jiangsu People’s Republic of China
| | - Fengjiao He
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Xingzhong Zhu
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Yujie Ma
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Rong He
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Feng Gao
- Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Weihai Ni
- Division of i-Lab, Key Laboratory of Nano-Bio Interface and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123 Jiangsu People’s Republic of China
| | - Yasha Yi
- Integrated Nano Optoelectronics Laboratory, Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI 48128 USA
- Energy Institute, University of Michigan, Ann Arbor, MI 48109 USA
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28
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Hussain A, Zia KM, Tabasum S, Noreen A, Ali M, Iqbal R, Zuber M. Blends and composites of exopolysaccharides; properties and applications: A review. Int J Biol Macromol 2017; 94:10-27. [DOI: 10.1016/j.ijbiomac.2016.09.104] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Revised: 09/23/2016] [Accepted: 09/29/2016] [Indexed: 01/21/2023]
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29
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Pal B, Römer RA, Chakrabarti A. Spin filter for arbitrary spins by substrate engineering. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:335301. [PMID: 27352129 DOI: 10.1088/0953-8984/28/33/335301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We design spin filters for particles with potentially arbitrary spin [Formula: see text] using a one-dimensional periodic chain of magnetic atoms as a quantum device. Describing the system within a tight-binding formalism we present an analytical method to unravel the analogy between a one-dimensional magnetic chain and a multi-strand ladder network. This analogy is crucial, and is subsequently exploited to engineer gaps in the energy spectrum by an appropriate choice of the magnetic substrate. We obtain an exact correlation between the magnitude of the spin of the incoming beam of particles and the magnetic moment of the substrate atoms in the chain desired for opening up of a spectral gap. Results of spin polarized transport, calculated within a transfer matrix formalism, are presented for particles having half-integer as well as higher spin states. We find that the chain can be made to act as a quantum device which opens a transmission window only for selected spin components over certain ranges of the Fermi energy, blocking them in the remaining part of the spectrum. The results appear to be robust even when the choice of the substrate atoms deviates substantially from the ideal situation, as verified by extending the ideas to the case of a 'spin spiral'. Interestingly, the spin spiral geometry, apart from exhibiting the filtering effect, is also seen to act as a device flipping spins-an effect that can be monitored by an interplay of the system size and the period of the spiral. Our scheme is applicable to ultracold quantum gases, and might inspire future experiments in this direction.
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Affiliation(s)
- Biplab Pal
- Department of Physics, University of Kalyani, Kalyani, West Bengal-741235, India
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30
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Morari C, Buimaga-Iarinca L, Rungger I, Sanvito S, Melinte S, Rignanese GM. Charge and spin transport in single and packed ruthenium-terpyridine molecular devices: Insight from first-principles calculations. Sci Rep 2016; 6:31856. [PMID: 27550064 PMCID: PMC4994010 DOI: 10.1038/srep31856] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Accepted: 07/28/2016] [Indexed: 01/17/2023] Open
Abstract
Using first-principles calculations, we study the electronic and transport properties of rutheniumterpyridine molecules sandwiched between two Au(111) electrodes. We analyse both single and packed molecular devices, more amenable to scaling and realistic integration approaches. The devices display all together robust negative differential resistance features at low bias voltages. Remarkably, the electrical control of the spin transport in the studied systems implies a subtle distribution of the magnetisation density within the biased devices and highlights the key role of the Au(111) electrical contacts.
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Affiliation(s)
- C. Morari
- National Institute for Research and Development of Isotopic and Molecular Technologies (NIRDIMT), 65-103 Donath, Ro-400293, Cluj-Napoca, Romania
| | - L. Buimaga-Iarinca
- National Institute for Research and Development of Isotopic and Molecular Technologies (NIRDIMT), 65-103 Donath, Ro-400293, Cluj-Napoca, Romania
| | - I. Rungger
- School of Physics and CRANN, Trinity College, Dublin 2, Ireland
- National Physical Laboratory, Teddington, TW11 0LW, United Kingdom
| | - S. Sanvito
- School of Physics and CRANN, Trinity College, Dublin 2, Ireland
| | - S. Melinte
- ICTM Institute, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - G.-M. Rignanese
- IMCN Institute, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
- European Theoretical Spectroscopy Facility (ETSF), 1348 Louvain-la-Neuve, Belgium
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31
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Lehmann H, Willing S, Möller S, Volkmann M, Klinke C. Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles. NANOSCALE 2016; 8:14384-14392. [PMID: 27232949 DOI: 10.1039/c6nr02489k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Metallic nanoparticles offer possibilities to build basic electric devices with new functionality and improved performance. Due to the small volume and the resulting low self-capacitance, each single nanoparticle exhibits a high charging energy. Thus, a Coulomb-energy gap emerges during transport experiments that can be shifted by electric fields, allowing for charge transport whenever energy levels of neighboring particles match. Hence, the state of the device changes sequentially between conducting and non-conducting instead of just one transition from conducting to pinch-off as in semiconductors. To exploit this behavior for field-effect transistors, it is necessary to use uniform nanoparticles in ordered arrays separated by well-defined tunnel barriers. In this work, CoPt nanoparticles with a narrow size distribution are synthesized by colloidal chemistry. These particles are deposited via the scalable Langmuir-Blodgett technique as ordered, homogeneous monolayers onto Si/SiO2 substrates with pre-patterned gold electrodes. The resulting nanoparticle arrays are limited to stripes of adjustable lengths and widths. In such a defined channel with a limited number of conduction paths the current can be controlled precisely by a gate voltage. Clearly pronounced Coulomb oscillations are observed up to temperatures of 150 K. Using such systems as field-effect transistors yields unprecedented oscillating current modulations with on/off-ratios of around 70%.
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Affiliation(s)
- Hauke Lehmann
- University of Hamburg, Institute of Physical Chemistry, Grindelallee 117, 20146 Hamburg, Germany.
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32
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Talib A, Khan MS, Gedda G, Hui-Fen Wu. Stabilization of gold nanoparticles using natural plant gel: A greener step towards biological applications. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.03.079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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33
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Surface enhanced Raman scattering of 2,2′-biphenyl dicarboxylic acid on silver surfaces: Structure and orientation upon adsorption. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.02.074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Li Z, Chen HYT, Schouteden K, Picot T, Houben K, Liao TW, Van Haesendonck C, Pacchioni G, Lievens P, Janssens E. Size-Dependent Penetration of Gold Nanoclusters through a Defect-Free, Nonporous NaCl Membrane. NANO LETTERS 2016; 16:3063-3070. [PMID: 27074132 DOI: 10.1021/acs.nanolett.6b00126] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Membranes and their size-selective filtering properties are universal in nature and their behavior is exploited to design artificial membranes suited for, e.g., molecule or nanoparticle filtering and separation. Exploring and understanding penetration and transmission mechanisms of nanoparticles in thin-film systems may provide new opportunities for size selective deposition or embedding of the nanoparticles. Here, we demonstrate an unexpected finding that the sieving of metal nanoparticles through atomically thin nonporous alkali halide films on a metal support is size dependent and that this sieving effect can be tuned via the film thickness. Specifically, relying on scanning tunneling microscopy and spectroscopy techniques, combined with density functional theory calculations, we find that defect-free NaCl films on a Au(111) support act as size-dependent membranes for deposited Au nanoclusters. The observed sieving ability is found to originate from a driving force toward the metal support and from the dynamics of both the nanoparticles and the alkali halide films.
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Affiliation(s)
- Zhe Li
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Hsin-Yi Tiffany Chen
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca , Via Cozzi 55, I-20125 Milano, Italy
| | - Koen Schouteden
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Thomas Picot
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Kelly Houben
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Ting-Wei Liao
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Chris Van Haesendonck
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Gianfranco Pacchioni
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca , Via Cozzi 55, I-20125 Milano, Italy
| | - Peter Lievens
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
| | - Ewald Janssens
- Laboratory of Solid-State Physics and Magnetism, KU Leuven , Celestijnenlaan 200 d, box 2414, BE-3001 Leuven, Belgium
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35
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Xiang D, Wang X, Jia C, Lee T, Guo X. Molecular-Scale Electronics: From Concept to Function. Chem Rev 2016; 116:4318-440. [DOI: 10.1021/acs.chemrev.5b00680] [Citation(s) in RCA: 816] [Impact Index Per Article: 102.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Dong Xiang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Key
Laboratory of Optical Information Science and Technology, Institute
of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China
| | - Xiaolong Wang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Chuancheng Jia
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Takhee Lee
- Department
of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
| | - Xuefeng Guo
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Department
of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
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36
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Lin B, Dong H, Du C, Hou T, Lin H, Li Y. B40 fullerene as a highly sensitive molecular device for NH3 detection at low bias: a first-principles study. NANOTECHNOLOGY 2016; 27:075501. [PMID: 26775574 DOI: 10.1088/0957-4484/27/7/075501] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The adsorption of small molecules (NH3, N2, H2 and CH4) on all-boron fullerene B40 is investigated by density functional theory (DFT) and the non-equilibrium Green's function (NEGF) for its potential application in the field of single-molecular gas sensors. The high adsorption energies (-1.09 to -0.75 eV) of NH3 on different adsorption sites of the B40 surface indicate that NH3 strongly chemisorbs to B40. The charge transfer induced by the NH3 adsorption results in a modification of the density of states (DOS) of B40 near the Fermi level, and therefore changes its electronic transport properties. For all possible adsorption sites, the adsorption of NH3 exclusively leads to a decrease of the conductance of B40. Taking into consideration that the non-polar gas molecules (e.g. N2, H2 and CH4) are only physisorbed and show negligible effect on the conductance properties of B40, we would expect that B40 can be used as a single-molecular gas sensor to distinguish NH3 from non-polar gas molecules at low bias.
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Affiliation(s)
- Bin Lin
- Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
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37
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Tong Y, Jiang T, Bendounan A, Harish MNK, Giglia A, Kubsky S, Sirotti F, Pasquali L, Sampath S, Esaulov VA. Case studies on the formation of chalcogenide self-assembled monolayers on surfaces and dissociative processes. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:263-277. [PMID: 26977383 PMCID: PMC4778531 DOI: 10.3762/bjnano.7.24] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 02/03/2016] [Indexed: 06/05/2023]
Abstract
This report examines the assembly of chalcogenide organic molecules on various surfaces, focusing on cases when chemisorption is accompanied by carbon-chalcogen atom-bond scission. In the case of alkane and benzyl chalcogenides, this induces formation of a chalcogenized interface layer. This process can occur during the initial stages of adsorption and then, after passivation of the surface, molecular adsorption can proceed. The characteristics of the chalcogenized interface layer can be significantly different from the metal layer and can affect various properties such as electron conduction. For chalcogenophenes, the carbon-chalcogen atom-bond breaking can lead to opening of the ring and adsorption of an alkene chalcogenide. Such a disruption of the π-electron system affects charge transport along the chains. Awareness about these effects is of importance from the point of view of molecular electronics. We discuss some recent studies based on X-ray photoelectron spectroscopy that shed light on these aspects for a series of such organic molecules.
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Affiliation(s)
- Yongfeng Tong
- Institut des Sciences Moléculaires d’Orsay, UMR 8214 CNRS-Université Paris Sud, Université Paris-Saclay, F-91405 Orsay, France
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Tingming Jiang
- Institut des Sciences Moléculaires d’Orsay, UMR 8214 CNRS-Université Paris Sud, Université Paris-Saclay, F-91405 Orsay, France
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
- Dipartimento di Ingegneria ‘E. Ferrari’, Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
| | - Azzedine Bendounan
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | | | - Angelo Giglia
- CNR-IOM, s.s.14, km 163.5 in Area Science Park, 34012 Trieste, Italy
| | - Stefan Kubsky
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Fausto Sirotti
- Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Luca Pasquali
- Dipartimento di Ingegneria ‘E. Ferrari’, Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
- CNR-IOM, s.s.14, km 163.5 in Area Science Park, 34012 Trieste, Italy
- Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
| | - Srinivasan Sampath
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, CV Raman Avenue, Bangalore 560 012, India
| | - Vladimir A Esaulov
- Institut des Sciences Moléculaires d’Orsay, UMR 8214 CNRS-Université Paris Sud, Université Paris-Saclay, F-91405 Orsay, France
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38
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Cirri A, Silakov A, Jensen L, Lear BJ. Probing ligand-induced modulation of metallic states in small gold nanoparticles using conduction electron spin resonance. Phys Chem Chem Phys 2016; 18:25443-25451. [DOI: 10.1039/c6cp02205g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We acquire conduction electron spin resonance spectra for small gold nanoparticles protected by a series of para-substituted thiophenol ligands. Our results demonstrate that changes in ligand identity affect the quantum mechanical behavior of electrons within the nanoparticle's metallic core.
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Affiliation(s)
| | | | - Lasse Jensen
- The Pennsylvania State University
- University Park
- USA
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39
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Iancu V, Schouteden K, Li Z, Van Haesendonck C. Electron–phonon coupling in engineered magnetic molecules. Chem Commun (Camb) 2016; 52:11359-11362. [DOI: 10.1039/c6cc03847f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We probe electron–phonon coupling in CoTPyP and CrTPyP synthesized magnetic molecules. Low temperatures STS reveals pronounced Kondo resonances at zero bias in both molecules and additional Kondo resonance replicas observed at higher voltages in vibrating CoTPyP molecules.
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Affiliation(s)
- Violeta Iancu
- Laboratory of Solid-State Physics and Magnetism
- KU Leuven
- BE-3001 Leuven
- Belgium
- Extreme Light Infrastructure – Nuclear Physics/Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
| | - Koen Schouteden
- Laboratory of Solid-State Physics and Magnetism
- KU Leuven
- BE-3001 Leuven
- Belgium
| | - Zhe Li
- Laboratory of Solid-State Physics and Magnetism
- KU Leuven
- BE-3001 Leuven
- Belgium
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40
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Shil S, Sarbadhikary P, Misra A. Effect of length on the transport and magnetic properties of diradical substituted molecular wires. RSC Adv 2016. [DOI: 10.1039/c6ra23147k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Extended π-conjugated molecules are known to have interesting applications as conducting nanowires, memory devices, and diodes.
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Affiliation(s)
- Suranjan Shil
- Institute for Inorganic and Applied Chemistry
- University of Hamburg
- 20146 Hamburg
- Germany
| | | | - Anirban Misra
- Department of Chemistry
- University of North Bengal
- India
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41
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Li J, Li T, Zhou Y, Wu W, Zhang L, Li H. Distinctive electron transport on pyridine-linked molecular junctions with narrow monolayer graphene nanoribbon electrodes compared with metal electrodes and graphene electrodes. Phys Chem Chem Phys 2016; 18:28217-28226. [DOI: 10.1039/c6cp05007g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrodes in the molecular devices are essential for creating functional organic electronic devices.
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Affiliation(s)
- Jie Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Tao Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Yi Zhou
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Weikang Wu
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Leining Zhang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
| | - Hui Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials
- Ministry of Education
- Shandong University
- Jinan 250061
- People's Republic of China
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42
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Zhao J, Sun S, Swartz L, Riechers S, Hu P, Chen S, Zheng J, Liu GY. "Size-Independent" Single-Electron Tunneling. J Phys Chem Lett 2015; 6:4986-4990. [PMID: 26618859 PMCID: PMC4758347 DOI: 10.1021/acs.jpclett.5b02323] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Incorporating single-electron tunneling (SET) of metallic nanoparticles (NPs) into modern electronic devices offers great promise to enable new properties; however, it is technically very challenging due to the necessity to integrate ultrasmall (<10 nm) particles into the devices. The nanosize requirements are intrinsic for NPs to exhibit quantum or SET behaviors, for example, 10 nm or smaller, at room temperature. This work represents the first observation of SET that defies the well-known size restriction. Using polycrystalline Au NPs synthesized via our newly developed solid-state glycine matrices method, a Coulomb Blockade was observed for particles as large as tens of nanometers, and the blockade voltage exhibited little dependence on the size of the NPs. These observations are counterintuitive at first glance. Further investigations reveal that each observed SET arises from the ultrasmall single crystalline grain(s) within the polycrystal NP, which is (are) sufficiently isolated from the nearest neighbor grains. This work demonstrates the concept and feasibility to overcome orthodox spatial confinement requirements to achieve quantum effects.
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Affiliation(s)
- Jianli Zhao
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - Shasha Sun
- Department of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Logan Swartz
- Biophysics Graduate Group, University of California, Davis, California 95616, United States
| | - Shawn Riechers
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - Peiguang Hu
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Jie Zheng
- Department of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Gang-yu Liu
- Department of Chemistry, University of California, Davis, California 95616, United States
- Biophysics Graduate Group, University of California, Davis, California 95616, United States
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43
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Monajjemi M. Cell membrane causes the lipid bilayers to behave as variable capacitors: A resonance with self-induction of helical proteins. Biophys Chem 2015; 207:114-27. [PMID: 26529673 DOI: 10.1016/j.bpc.2015.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 10/20/2015] [Accepted: 10/20/2015] [Indexed: 01/10/2023]
Abstract
Cell membrane has a unique feature of storing biological energies in a physiologically relevant environment. This study illustrates a capacitor model of biological cell membrane including DPPC structures. The electron density profile models, electron localization function (ELF) and local information entropy have been applied to study the interaction of proteins with lipid bilayers in the cell membrane. The quantum and coulomb blockade effects of different thicknesses in the membrane have also been specifically investigated. It has been exhibited the quantum effects can appear in a small region of the free space within the membrane thickness due to the number and type of phospholipid layers. In addition, from the viewpoint of quantum effects by Heisenberg rule, it is shown the quantum tunneling is allowed in some micro positions while it is forbidden in other forms of membrane capacitor systems. Due to the dynamical behavior of the cell membrane, its capacitance is not fixed which results a variable capacitor. In presence of the external fields through protein trance membrane or ions, charges exert forces that can influence the state of the cell membrane. This causes to appear the charge capacitive susceptibility that can resonate with self-induction of helical coils; the resonance of which is the main reason for various biological pulses.
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Affiliation(s)
- Majid Monajjemi
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.
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44
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45
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Jia J, Kara A, Pasquali L, Bendounan A, Sirotti F, Esaulov VA. On sulfur core level binding energies in thiol self-assembly and alternative adsorption sites: An experimental and theoretical study. J Chem Phys 2015; 143:104702. [PMID: 26374051 DOI: 10.1063/1.4929350] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Characteristic core level binding energies (CLBEs) are regularly used to infer the modes of molecular adsorption: orientation, organization, and dissociation processes. Here, we focus on a largely debated situation regarding CLBEs in the case of chalcogen atom bearing molecules. For a thiol, this concerns the case when the CLBE of a thiolate sulfur at an adsorption site can be interpreted alternatively as due to atomic adsorption of a S atom, resulting from dissociation. Results of an investigation of the characteristics of thiol self-assembled monolayers (SAMs) obtained by vacuum evaporative adsorption are presented along with core level binding energy calculations. Thiol ended SAMs of 1,4-benzenedimethanethiol (BDMT) obtained by evaporation on Au display an unconventional CLBE structure at about 161.25 eV, which is close to a known CLBE of a S atom on Au. Adsorption and CLBE calculations for sulfur atoms and BDMT molecules are reported and allow delineating trends as a function of chemisorption on hollow, bridge, and atop sites and including the presence of adatoms. These calculations suggest that the 161.25 eV peak is due to an alternative adsorption site, which could be associated to an atop configuration. Therefore, this may be an alternative interpretation, different from the one involving the adsorption of atomic sulfur resulting from the dissociation process of the S-C bond. Calculated differences in S(2p) CLBEs for free BDMT molecules, SH group sulfur on top of the SAM, and disulfide are also reported to clarify possible errors in assignments.
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Affiliation(s)
- Juanjuan Jia
- Institut des Sciences Moléculaires d'Orsay, Université-Paris Sud, 91405 Orsay, France
| | - Abdelkader Kara
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - Luca Pasquali
- Dipartimento di Ingegneria "E. Ferrari," Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
| | - Azzedine Bendounan
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Fausto Sirotti
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Vladimir A Esaulov
- Institut des Sciences Moléculaires d'Orsay, Université-Paris Sud, 91405 Orsay, France
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46
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Nanayakkara SU, van de Lagemaat J, Luther JM. Scanning Probe Characterization of Heterostructured Colloidal Nanomaterials. Chem Rev 2015. [PMID: 26196958 DOI: 10.1021/cr500280t] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sanjini U. Nanayakkara
- National Renewable Energy Laboratory, 15013 Denver
West Parkway, Golden, Colorado 80401, United States
| | - Jao van de Lagemaat
- National Renewable Energy Laboratory, 15013 Denver
West Parkway, Golden, Colorado 80401, United States
| | - Joseph M. Luther
- National Renewable Energy Laboratory, 15013 Denver
West Parkway, Golden, Colorado 80401, United States
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47
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Escalera-López D, Gómez E, Vallés E. Electrochemical growth of CoNi and Pt-CoNi soft magnetic composites on an alkanethiol monolayer-modified ITO substrate. Phys Chem Chem Phys 2015; 17:16575-86. [PMID: 26055346 DOI: 10.1039/c5cp02291f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
CoNi and Pt-CoNi magnetic layers on indium-tin oxide (ITO) substrates modified by an alkanethiol self-assembled monolayer (SAM) have been electrochemically obtained as an initial stage to prepare semiconducting layer-SAM-magnetic layer hybrid structures. The best conditions to obtain the maximum compactness of adsorbed layers of dodecanethiol (C12-SH) on ITO substrate have been studied using contact angle, AFM, XPS and electrochemical tests. The electrochemical characterization (electrochemical probe or voltammetric response in blank solutions) is fundamental to ensure the maximum blocking of the substrate. Although the electrodeposition process on the SAM-modified ITO substrate is very slow if the blocking of the surface is significant, non-cracked metallic layers of CoNi, with or without a previously electrodeposited seed-layer of platinum, have been obtained by optimizing the deposition potentials. Initial nucleation is expected to take place at the pinhole defects of the C12-SH SAM, followed by a mushroom-like growth regime through the SAM interface that allows the formation of a continuous metallic layer electrically connected to the ITO surface. Due to the potential of the methodology, the preparation of patterned metallic deposits on ITO substrate using SAMs with different coverage as templates is feasible.
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Affiliation(s)
- D Escalera-López
- Grup d'Electrodeposició de Capes Primes i Nanoestructures (Ge-CPN), Departament de Química Física and Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
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48
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Affiliation(s)
- Robert M. Metzger
- Laboratory for Molecular
Electronics, Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, Alabama 35487-0336, United States
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49
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Dhayal RS, Liao JH, Kahlal S, Wang X, Liu YC, Chiang MH, van Zyl WE, Saillard JY, Liu CW. [Cu32(H)20{S2P(OiPr)2}12]: The Largest Number of Hydrides Recorded in a Molecular Nanocluster by Neutron Diffraction. Chemistry 2015; 21:8369-74. [DOI: 10.1002/chem.201501122] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Indexed: 12/26/2022]
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50
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Yan JK, Liu JL, Sun YJ, Tang S, Mo ZY, Liu YS. Green synthesis of biocompatible carboxylic curdlan-capped gold nanoparticles and its interaction with protein. Carbohydr Polym 2015; 117:771-777. [DOI: 10.1016/j.carbpol.2014.10.048] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 09/27/2014] [Accepted: 10/16/2014] [Indexed: 01/18/2023]
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