1
|
Banik M, Shenhar R. Nanoparticle assembly by transient topography induced by applying soft lithography to block copolymer films. SOFT MATTER 2024; 20:4035-4042. [PMID: 38699791 DOI: 10.1039/d4sm00234b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
We present a simple approach for patterning metal nanoparticles into periodic superstructures on flat films spanning centimeter-square areas. Our approach is based on capillary force lithography, a soft lithography method that is used to impart topography to molten polymer films, and applies it to block copolymer films to obtain substrates featuring both topographic and chemical contrasts that can serve as templates for the selective deposition of nanoparticles. Here we show that flattening the films by exposure to solvent vapour prior to nanoparticle deposition not only retains chemical heterogeneity but also provides access to unique hierarchically-organized nanoparticle superstructures that are unattainable by other methods. Such structures could be useful for optical, sensor, and catalytic applications.
Collapse
Affiliation(s)
- Meneka Banik
- The Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
| | - Roy Shenhar
- The Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
| |
Collapse
|
2
|
Gold nanoparticle arrays organized in mixed patterns through directed self-assembly of ultrathin block copolymer films on topographic substrates. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124727] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
3
|
Burg O, Sanguramath RA, Michman E, Eren N, Popov I, Shenhar R. Periodic nanowire arrays with alternating compositions and structures fabricated using a simultaneous nanowire formation step. SOFT MATTER 2021; 17:9937-9943. [PMID: 34693421 DOI: 10.1039/d1sm01313k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Arrays of alternating metallic nanostructures present hybrid properties, which are useful for applications in photonics and catalysis. Block copolymer films provide versatile templates for fabricating periodic arrays of nanowires. Yet, creating arrays with alternating compositions or structures requires different modifications of domains of the same kind. By controlling the penetration depth of metal precursors into the film we were able to impregnate different layers of copolymer cylinders with different metals. Capitalizing on the hexagonal packing of the cylinders led to simultaneous formation of nanowires with alternating compositions and periodic arrangement on the substrate after plasma etching. Selective deposition of nanoparticles on the film enabled creating alternating bare and decorated nanowires, as well as trimetallic nanowire arrays.
Collapse
Affiliation(s)
- Ofer Burg
- The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Rajashekharayya A Sanguramath
- The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Elisheva Michman
- The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Noga Eren
- The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Inna Popov
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Roy Shenhar
- The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| |
Collapse
|
4
|
Fontelo R, Soares da Costa D, Reis RL, Novoa-Carballal R, Pashkuleva I. Antithrombotic and hemocompatible properties of nanostructured coatings assembled from block copolymers. J Colloid Interface Sci 2021; 608:1608-1618. [PMID: 34742077 DOI: 10.1016/j.jcis.2021.10.076] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 10/08/2021] [Accepted: 10/13/2021] [Indexed: 01/03/2023]
Abstract
We describe the antithrombotic properties of nanopatterned coatings created by self-assembly of poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) with different molecular weights. By changing the assembly conditions, we obtained nanopatterns that differ by their morphology (size and shape of the nanopattern) and chemistry. The surface exposition of P2VP block allowed quaternization, i.e. introduction of positive surface charge and following electrostatic deposition of heparin. Proteins (albumin and fibrinogen) adsorption, platelet adhesion and activation, cytocompatibility, and reendothelization capacity of the coatings were assessed and discussed in a function of the nanopattern morphology and chemistry. We found that quaternization results in excellent antithrombotic and hemocompatible properties comparable to heparinization by hampering the fibrinogen adhesion and platelet activation. In the case of quaternization, this effect depends on the size of the polymer blocks, while all heparinized patterns had similar performance showing that heparin surface coverage of 40 % is enough to improve substantially the hemocompatibility.
Collapse
Affiliation(s)
- R Fontelo
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - D Soares da Costa
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - R L Reis
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - R Novoa-Carballal
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| | - I Pashkuleva
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal.
| |
Collapse
|
5
|
Two-Dimensional Crystalline Gridding Networks of Hybrid Halide Perovskite for Random Lasing. CRYSTALS 2021. [DOI: 10.3390/cryst11091114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We report fabrication of large-scale homogeneous crystallization of CH3NH3PbBr3 (MAPbBr3) in the patterned substrate by a two-dimensional (2D) grating. This achieves high-quality optotelectronic structures on local sites in the micron scales and a homogeneous thin-film device in a centimeter scale, proposing a convenient technique to overcome the challenge for producing large-area thin-film devices with high quality by spin-coating. Through matching the concentration of the MAPbBr3/DMF solutions with the periods of the patterning structures, we found an optimized size of the patterning channels for a specified solution concentration (e.g., channel width of 5 μm for a concentration of 0.14 mg/mL). Such a design is also an excellent scheme for random lasing, since the crystalline periodic networks of MAPbBr3 grids are multi-crystalline constructions, and supply strong light-scattering interfaces. Using the random lasing performance, we can also justify the crystallization qualities and reveal the responsible mechanisms. This is important for the design of large-scale optoelectronic devices based on thin-film hybrid halide perovskites.
Collapse
|
6
|
Zhang S, Xia F, Demoustier-Champagne S, Jonas AM. Layer-by-layer assembly in nanochannels: assembly mechanism and applications. NANOSCALE 2021; 13:7471-7497. [PMID: 33870383 DOI: 10.1039/d1nr01113h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Layer-by-layer (LbL) assembly is a versatile technology to construct multifunctional nanomaterials using various supporting substrates, enabled by the large selection freedom of building materials and diversity of possible driving forces. The fine regulation over the film thickness and structure provides an elegant way to tune the physical/chemical properties by mild assembly conditions (e.g. pH, ion strength). In this review, we focus on LbL in nanochannels, which exhibit a different growth mechanism compared to "open", convex substrates. The assembly mechanism in nanochannels is discussed in detail, followed by the summary of applications of LbL assemblies liberated from nanochannel templates which can be used as nanoreactors, drug carriers and transporting channels across cell membranes. For fluidic applications, robust membrane substrates are required to keep in place nanotube arrays for membrane-based separation, purification, biosensing and energy harvesting, which are also discussed. The good compatibility of LbL with crossover technologies from other fields allows researchers to further extend this technology to a broader range of research fields, which is expected to result in an increased number of applications of LbL technology in the future.
Collapse
Affiliation(s)
- Shouwei Zhang
- Faculty of Materials Science and Chemistry, China University of Geosciences, 430074 Wuhan, China
| | - Fan Xia
- Faculty of Materials Science and Chemistry, China University of Geosciences, 430074 Wuhan, China
| | - Sophie Demoustier-Champagne
- Institute of Condensed Matter and Nanosciences - Bio and Soft Matter (IMCN/BSMA), Université catholique de Louvain, Croix du Sud 1/L7.04.02, B1348 Louvain-la-Neuve, Belgium.
| | - Alain M Jonas
- Institute of Condensed Matter and Nanosciences - Bio and Soft Matter (IMCN/BSMA), Université catholique de Louvain, Croix du Sud 1/L7.04.02, B1348 Louvain-la-Neuve, Belgium.
| |
Collapse
|
7
|
Fontelo R, Soares da Costa D, Reis R, Novoa-Carballal R, Pashkuleva I. Bactericidal nanopatterns generated by block copolymer self-assembly. Acta Biomater 2020; 112:174-181. [PMID: 32525051 DOI: 10.1016/j.actbio.2020.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 05/27/2020] [Accepted: 06/02/2020] [Indexed: 02/08/2023]
Abstract
We describe the bactericidal capacity of nanopatterned surfaces created by self-assembly of block copolymers. Distinct nanotopographies were generated by spin-coating with polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) followed by solvent vapor annealing. We demonstrate that the bactericidal efficiency of the developed coatings depends on the morphology and the chemistry of the surface: cylindrical nanotopographies presenting both blocks at the surface have stronger bactericidal effect on Escherichia coli than micellar patterns with only PS exposed at the surface. The identified mechanism of bacterial death is a mechanical stress exerted by the nanostructures on the cell-wall. Moreover, the developed nanopatterns are not cytotoxic, which makes them an excellent option for coating of implantable materials and devices. The proposed approach represents an efficient tool in the fight against bacteria, which acts via compromising the bacterial wall integrity. STATEMENT OF SIGNIFICANCE: Bacterial infections represent an important risk during biomaterial implantation in surgeries due to the increase of antibiotic resistance. Bactericidal surfaces are a promising solution to avoid the use of antibiotics, but most of those systems do not allow mammalian cell survival. Nanopatterned silicon surfaces have demonstrated to be simultaneously bactericidal and allow mammalian cell culture but are made by physical methods (e.g. plasma etching) applicable to few materials and small surfaces. In this article we show that block copolymer self-assembly can be used to develop surfaces that kill bacteria (E. coli) but do not harm mammalian cells. Block copolymer self-assembly has the advantage of being applicable to many different types of substrates and large surface areas.
Collapse
|
8
|
Gaikwad HS, Kumar G, Mondal PK. Efficient electroosmotic mixing in a narrow-fluidic channel: the role of a patterned soft layer. SOFT MATTER 2020; 16:6304-6316. [PMID: 32572423 DOI: 10.1039/d0sm00890g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We propose a novel and efficient mixing technique in a soft narrow-fluidic channel under the influence of electrical forcing. We show that a grafted polyelectrolyte layer (PEL) added as a patch to the channel wall modulates the electrical double layer (EDL) so that an applied electric field initiates a local electroosmotic flow (EOF) at the patched section. This EOF develops in the opposite direction to the primary pressure-driven flow. This localized EOF leads to the formation of Lamb vortices at the patched sections through the phenomenon of momentum exchange with the primary stream and promotes the mixing therein. Our study, consistent with the stream-function/vorticity approach, primarily focuses on the numerical analysis of the mixing phenomena. Through a quantitative description, we reveal the effect of different patterns on the underlying mixing phenomena in the convective mixing regime. We also discuss the impact of key parameters on the mixing efficiency, the onset of the recirculation zone, variation in the mixing length, and the shear-driven aggregation kinetics in soft matter systems. Finally, considering the practicability of the present problem, we unveil the values of several design parameters for which the mixing efficiency in the channel reaches the maximum.
Collapse
Affiliation(s)
- Harshad Sanjay Gaikwad
- Microfluidics and Microscale Transport Processes Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam 781039, India.
| | | | | |
Collapse
|
9
|
Shen MY, Yuran S, Aviv Y, Ayalew H, Luo CH, Tsai YH, Reches M, Yu HH, Shenhar R. Electrically Responsive, Nanopatterned Surfaces for Triggered Delivery of Biologically Active Molecules into Cells. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1201-1208. [PMID: 30565453 DOI: 10.1021/acsami.8b15308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Polyelectrolyte multilayers (PEMs) assembled layer-by-layer have emerged as functional polymer films that are both stable and capable of containing drug molecules for controlled release applications. Most of these applications concentrate on sustained release, where the concentration of the released molecules remains rather constant with time. However, high-efficiency delivery requires obtaining high local concentrations at the vicinity of the cells, which is achieved by triggered release. Here, we show that a nanopatterned PEM platform demonstrates superior properties with respect to drug retention and triggered delivery. A chemically modified block copolymer film was used as a template for the selective deposition of poly(ethylene imine) and a charged derivative of the electroactive poly(3,4-ethylenedioxythiophene) together with a drug molecule. This nanopatterned PEM shows the following advantages: (1) high drug loading; (2) enhanced retention of the bioactive molecule; (3) release triggered by an electrochemical stimulus; (4) high efficacy of drug delivery to cells adsorbed on the surface compared to the delivery efficacy of a similar concentration of drug to cells suspended in a solution.
Collapse
Affiliation(s)
- Mo-Yuan Shen
- Institute of Chemistry , Academia Sinica , 128 Academia Road Sec. 2 , Nankang, Taipei 115 , Taiwan
| | - Sivan Yuran
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, Edmond J. Safra Campus , The Hebrew University of Jerusalem , Jerusalem 9190401 , Israel
| | - Yaron Aviv
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, Edmond J. Safra Campus , The Hebrew University of Jerusalem , Jerusalem 9190401 , Israel
| | - Hailemichael Ayalew
- Institute of Chemistry , Academia Sinica , 128 Academia Road Sec. 2 , Nankang, Taipei 115 , Taiwan
- Taiwan International Graduate Program (TIGP), Sustainable Chemical Science and Technology (SCST) , Academia Sinica , Taipei 115 , Taiwan
| | - Chun-Hao Luo
- Institute of Chemistry , Academia Sinica , 128 Academia Road Sec. 2 , Nankang, Taipei 115 , Taiwan
| | - Yu-Han Tsai
- Institute of Chemistry , Academia Sinica , 128 Academia Road Sec. 2 , Nankang, Taipei 115 , Taiwan
| | - Meital Reches
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, Edmond J. Safra Campus , The Hebrew University of Jerusalem , Jerusalem 9190401 , Israel
| | - Hsiao-Hua Yu
- Institute of Chemistry , Academia Sinica , 128 Academia Road Sec. 2 , Nankang, Taipei 115 , Taiwan
- Taiwan International Graduate Program (TIGP), Sustainable Chemical Science and Technology (SCST) , Academia Sinica , Taipei 115 , Taiwan
| | - Roy Shenhar
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, Edmond J. Safra Campus , The Hebrew University of Jerusalem , Jerusalem 9190401 , Israel
| |
Collapse
|
10
|
Asor L, Nir S, Oded M, Reches M, Shenhar R. Nano-patterned polyelectrolyte multilayers assembled using block copolymer templates: The combined effect of ionic strength and nano-confinement. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.08.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
11
|
Huang H, Zhong B, Zu X, Luo H, Lin W, Zhang M, Zhong Y, Yi G. Fabrication of Ordered Nanopattern by using ABC Triblock Copolymer with Salt in Toluene. NANOSCALE RESEARCH LETTERS 2017; 12:491. [PMID: 28812244 PMCID: PMC5557723 DOI: 10.1186/s11671-017-2260-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 08/01/2017] [Indexed: 06/07/2023]
Abstract
Ordered nanopatterns of triblock copolymer polystyrene-block-poly(2-vinylpyridine)-block- poly (ethylene oxide)(PS-b-P2VP-b-PEO) have been achieved by the addition of lithium chloride (LiCl). The morphological and structural evolution of PS-b-P2VP-b-PEO/LiCl thin films were systematically investigated by varying different experimental parameters, including the treatment for polymer solution after the addition of LiCl, the time scale of ultrasonic treatment and the molar ratio of Li+ ions to the total number of oxygen atoms (O) in PEO block and the nitrogen atoms (N) in P2VP block. When toluene was used as the solvent for LiCl, ordered nanopattern with cylinders or nanostripes could be obtained after spin-coating. The mechanism of nanopattern transformation was related to the loading of LiCl in different microdomains.
Collapse
Affiliation(s)
- Hailiang Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China
| | - Benbin Zhong
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China
| | - Xihong Zu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China.
| | - Hongsheng Luo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China
| | - Wenjing Lin
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China
| | - Minghai Zhang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China
| | - Yazhou Zhong
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China
| | - Guobin Yi
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, People's Republic of China.
| |
Collapse
|
12
|
Oded M, Kelly ST, Gilles MK, Müller AH, Shenhar R. From dots to doughnuts: Two-dimensionally confined deposition of polyelectrolytes on block copolymer templates. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.07.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
13
|
Oded M, Müller AHE, Shenhar R. A block copolymer-templated construction approach for the creation of nano-patterned polyelectrolyte multilayers and nanoscale objects. SOFT MATTER 2016; 12:8098-8103. [PMID: 27550638 DOI: 10.1039/c6sm01678b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A block copolymer-based assembly approach for the creation of nano-patterned polyelectrolyte multilayers over cm2-scale areas is presented. Up to 5 bi-layers were selectively assembled on top of specific nano-domains featuring different morphologies. The successful isolation of nanoscale objects corresponding in shape to the template features is also demonstrated. This methodology is applicable to different types of polyelectrolytes, and opens up a new dimension for layer-by-layer construction.
Collapse
Affiliation(s)
- Meirav Oded
- The Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
| | | | | |
Collapse
|
14
|
Wagner T, Lazar J, Schnakenberg U, Böker A. In situ Electrochemical Impedance Spectroscopy of Electrostatically Driven Selective Gold Nanoparticle Adsorption on Block Copolymer Lamellae. ACS APPLIED MATERIALS & INTERFACES 2016; 8:27282-27290. [PMID: 27696797 DOI: 10.1021/acsami.6b07708] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Electrostatic attraction between charged nanoparticles and oppositely charged nanopatterned polymeric films enables tailored structuring of functional nanoscopic surfaces. The bottom-up fabrication of organic/inorganic composites for example bears promising potential toward cheap fabrication of catalysts, optical sensors, and the manufacture of miniaturized electric circuitry. However, only little is known about the time-dependent adsorption behavior and the electronic or ionic charge transfer in the film bulk and at interfaces during nanoparticle assembly via electrostatic interactions. In situ electrochemical impedance spectroscopy (EIS) in combination with a microfluidic system for fast and reproducible liquid delivery was thus applied to monitor the selective deposition of negatively charged gold nanoparticles on top of positively charged poly(2-vinylpyridinium) (qP2VP) domains of phase separated lamellar poly(styrene)-block-poly(2-vinylpyridinium) (PS-b-qP2VP) diblock copolymer thin films. The acquired impedance data delivered information with respect to interfacial charge alteration, ionic diffusion, and the charge dependent nanoparticle adsorption kinetics, considering this yet unexplored system. We demonstrate that the selective adsorption of negatively charged gold nanoparticles (AuNPs) on positively charged qP2VP domains of lamellar PS-b-qP2VP thin films can indeed be tracked by EIS. Moreover, we show that the nanoparticle adsorption kinetics and the nanoparticle packing density are functions of the charge density in the qP2VP domains.
Collapse
Affiliation(s)
- Tom Wagner
- DWI - Leibniz Institute for Interactive Materials , Forckenbeckstraße 50, 52056 Aachen, Germany
| | - Jaroslav Lazar
- Institute of Materials in Electrical Engineering 1, RWTH Aachen University , Sommerfeldstraße 24, 52074 Aachen, Germany
| | - Uwe Schnakenberg
- Institute of Materials in Electrical Engineering 1, RWTH Aachen University , Sommerfeldstraße 24, 52074 Aachen, Germany
| | - Alexander Böker
- Chair for Polymer Materials and Polymer Technology, University of Potsdam & Fraunhofer Institute for Applied Polymer Research (IAP) , Geiselbergstraße 69, 14476 Potsdam-Golm, Germany
| |
Collapse
|
15
|
Wagner T, Oded M, Shenhar R, Böker A. Two-dimensionally ordered AuNP array formation via microcontact printing on lamellar diblock copolymer films. POLYM ADVAN TECHNOL 2016. [DOI: 10.1002/pat.3853] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Tom Wagner
- DWI - Leibniz Institut für Interaktive Materialien; Forckenbeckstraße 50 D-52056 Aachen Germany
| | - Meirav Oded
- Institute of Chemistry and the Hebrew University Center for Nanoscience and Nanotechnology; The Hebrew University of Jerusalem; Jerusalem Israel 9190401
| | - Roy Shenhar
- Institute of Chemistry and the Hebrew University Center for Nanoscience and Nanotechnology; The Hebrew University of Jerusalem; Jerusalem Israel 9190401
| | - Alexander Böker
- Fraunhofer-Institut für Angewandte Polymerforschung IAP, Lehrstuhl für Polymermaterialien und Polymertechnologien; Universität Potsdam; Geiselbergstraße 69 14476 Potsdam Germany
| |
Collapse
|