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Soltani N, Zheng Y, Bachilo SM, Weisman RB. Structure-Resolved Monitoring of Single-Wall Carbon Nanotube Functionalization from Raman Intermediate Frequency Modes. J Phys Chem Lett 2023; 14:7960-7966. [PMID: 37646617 DOI: 10.1021/acs.jpclett.3c02100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Single-wall carbon nanotubes (SWCNTs) can be covalently modified to generate useful changes in their spectroscopic and photophysical properties. We report here a new method to monitor the extent of such functionalization reactions for different nanotube structures. Raman spectra are analyzed to find the intensities of structure-specific intermediate frequency mode (IFM) features in the range of ca. 350 to 650 cm-1, which are induced by introduction of sp3 defects. The IFM frequencies are found to depend on both the nanotube diameter and Raman excitation wavelength. The growth of IFM features is accompanied by a decrease in RBM intensities, so the IFM to RBM intensity ratio can provide a sensitive, structure-specific measure of nanotube functionalization.
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Affiliation(s)
- Nima Soltani
- Department of Chemistry and the Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States
| | - Yu Zheng
- Department of Chemistry and the Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States
| | - Sergei M Bachilo
- Department of Chemistry and the Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States
| | - R Bruce Weisman
- Department of Chemistry and the Smalley-Curl Institute, Rice University, Houston, Texas 77005, United States
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
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2
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Singh RP, Kaur T. HRMAS-NMR and simulation study of the self-assembly of surfactants on carbon nanotubes. Phys Chem Chem Phys 2023; 25:12900-12913. [PMID: 37165884 DOI: 10.1039/d2cp03762a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Polyethoxylated surfactants, such as those of the Tween and Pluronic series, are commonly used to disperse carbon nanotubes (CNTs) and other nanoparticles. However, the current understanding of the nature of interactions between these surfactants and CNTs is limited. The nature of the interactions between surfactants (Tween-80 [T80] and Pluronic F68 [PF68]) and CNTs was investigated using high-resolution magic angle spinning nuclear magnetic resonance (HRMAS-NMR) and coarse-grained molecular dynamics (MD) simulations. HRMAS-NMR revealed that T80 molecules interact with single-walled CNTs (SWCNTs) and multi-walled CNTs (MWCNTs) via the oleyl chain, whereas PF68 molecules interact with the surface of SWCNTs and MWCNTs via the polypropylene oxide residues. The polyethylene oxide chains were oriented towards the external aqueous environment. The HRMAS-NMR results were supported by MD simulations, and the latter provided further insights into the nature of the interactions.
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Affiliation(s)
- Raman Preet Singh
- Department of Pharmaceutical Sciences, Government Polytechnic College for Girls, Patiala, PB, 147 001, India.
| | - Taranpreet Kaur
- Department of Biotechnology, Government Mohindra College, Patiala, PB, 147 001, India
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3
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Tiwari P, Podleśny B, Krzywiecki M, Milowska KZ, Janas D. Understanding the partitioning behavior of single-walled carbon nanotubes using an aqueous two-phase extraction system composed of non-ionic surfactants and polymers. NANOSCALE HORIZONS 2023; 8:685-694. [PMID: 36919756 DOI: 10.1039/d3nh00023k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In this work, a Pluronic/Dextran system was developed to discover the mechanism of the aqueous two-phase extraction (ATPE) technique, which is widely employed for the sorting of single-walled carbon nanotubes (SWCNTs) and other types of nanomaterials. The role of the phase-forming components and partitioning modulators was comprehensively investigated to gain greater insights into the differentiation process. The obtained results revealed that sodium dodecyl sulfate and sodium dodecylbenzene sulfonate operated as excellent partitioning modulators, enabling the diameter-based sorting of SWCNTs. Additionally, the data strongly suggested that different densities of various SWCNT species drove the movement of SWCNTs in the ATPE system. Consequently, the largest diameter SWCNTs were first influenced by surfactants and, thus, the nanotubes migrated towards a lower density top phase in the following order (7,5) > (8,3) > (6,5) > (6,4). Based on the in-depth analysis of the partitioning system, a mechanism was proposed that described the method in which the popular ATPE separation technique operates.
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Affiliation(s)
- Pranjala Tiwari
- Department of Chemistry, Silesian University of Technology, B. Krzywoustego 4, 44-100, Gliwice, Poland.
| | - Błażej Podleśny
- Department of Chemistry, Silesian University of Technology, B. Krzywoustego 4, 44-100, Gliwice, Poland.
| | - Maciej Krzywiecki
- Institute of Physics-CSE, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland
| | - Karolina Z Milowska
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
- TCM Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - Dawid Janas
- Department of Chemistry, Silesian University of Technology, B. Krzywoustego 4, 44-100, Gliwice, Poland.
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4
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Zueva OS, Makarova AO, Zvereva ER, Bakhtiyarova YV, Yanushevskaya YS, Turanov AN. Poloxamers and Poloxamines for Dispersion of Carbon Nanomaterials. POLYMER SCIENCE SERIES A 2022. [DOI: 10.1134/s0965545x22700341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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5
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Bisht A, Zuñiga-Bustos M, Prasher G, Gautam S, Poblete H, Singh RP. Stabilization of Carbon Nanotubes and Graphene by Tween-80: Mechanistic Insights from Spectroscopic and Simulation Studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:10173-10182. [PMID: 35947770 DOI: 10.1021/acs.langmuir.2c01190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Polyoxyethylene sorbitan monooleate is commonly used to obtain stable dispersions of nanoparticles (NPs) such as carbon nanotubes (CNTs) and graphene. However, the mechanism underlying dispersion is poorly understood. The present study aimed at investigating the mechanism of stabilization of carbon NPs (CNPs), namely, single-walled CNTs (SWCNTs), multi-walled CNTs (MWCNTs), and graphene, by Tween-80 using attenuated total internal reflection-Fourier transform infrared and nuclear magnetic resonance (NMR) spectroscopy. Molecular dynamics (MD) simulations were performed to identify, at the atomic scale, the significant interactions that underlie the adsorption and the stabilizing effect of Tween-80 on CNPs, in this way corroborating the spectroscopy results. Spectroscopic analysis revealed that the alkyl chain tether to SWCNT, MWCNT, and graphene surface, presumably through π-π interactions between the carbon-carbon double bond in the alkyl chain and the aromatic rings of CNPs. The hydrophilic polyethoxylate chains extend into the aqueous environment and stabilize the suspension by steric hindrance. MD simulations also showed that Tween-80 molecules interact with the CNP surface via the alkyl chain, thus corroborating spectroscopy results. MD simulations additionally revealed that Tween-80 aggregates on the CNP surface shifted from planar to micelle-like with increasing Tween-80 ratios, underscoring concentration-dependent changes in the nature of these interactions.
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Affiliation(s)
- Alpna Bisht
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
| | - Matías Zuñiga-Bustos
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación (PIDi), Universidad Tecnológica Metropolitana, Santiago 8940577, Chile
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, 2 Norte 685, Talca 3465548, Chile
| | - Garima Prasher
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
| | - Surbhi Gautam
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
| | - Horacio Poblete
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, 2 Norte 685, Talca 3465548, Chile
- Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Talca 3465548, Chile
| | - Raman Preet Singh
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
- Department of Pharmacy, Government Polytechnic College, Bathinda, Punjab 151 001, India
- Department of Pharmaceutical Sciences, Government Polytechnic College for Girls, Patiala, Punjab 147 001, India
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6
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Zueva OS, Makarova AO, Zvereva ER, Kh. Kurbanov R, Salnikov VV, Turanov AN, Zuev YF. Industrial block copolymer surfactants: Diversity of associative forms and interaction with carbon nanomaterial. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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7
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Kato H, Nakamura A, Shimizu M. Effect of surfactant micelle size on the dispersibility of aqueous carbon black particle suspensions prepared by ultrasonication. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Carbon Nanotube Film/Silicon Heterojunction Photodetector for New Cutting-Edge Technological Devices. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11020606] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Photodetector (PD) devices based on carbon nanotube/n-silicon heterojunction (NSH) have been realized, with a linear response in a large optical power range, proving competitive performances with respect to a recent nanostructure-based detector and those currently available on the market. The core of these devices is a thin semi-transparent and conductive single-walled carbon nanotubes film with a multitask role: junction element, light absorber and transmitter, photocarrier transporting layer, and charge collector. The PD exhibits rise times of some nanoseconds, detecting light from ultraviolet (240 nm) to infrared (1600 nm), and external quantum efficiency reaching 300% in the VIS spectra region.
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9
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Chaudhary H, Fernandes RMF, Gowda V, Claessens MMAE, Furó I, Lendel C. Intrinsically disordered protein as carbon nanotube dispersant: How dynamic interactions lead to excellent colloidal stability. J Colloid Interface Sci 2019; 556:172-179. [PMID: 31445446 DOI: 10.1016/j.jcis.2019.08.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/12/2019] [Accepted: 08/13/2019] [Indexed: 11/19/2022]
Abstract
The rich pool of protein conformations combined with the dimensions and properties of carbon nanotubes create new possibilities in functional materials and nanomedicine. Here, the intrinsically disordered protein α-synuclein is explored as a dispersant of single-walled carbon nanotubes (SWNTs) in water. We use a range of spectroscopic methods to quantify the amount of dispersed SWNT and to elucidate the binding mode of α-synuclein to SWNT. The dispersion ability of α-synuclein is good even with mild sonication and the obtained dispersion is very stable over time. The whole polypeptide chain is involved in the interaction accompanied by a fraction of the chain changing into a helical structure upon binding. Similar to other dispersants, we observe that only a small fraction (15-20%) of α-synuclein is adsorbed on the SWNT surface with an average residence time below 10 ms.
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Affiliation(s)
- Himanshu Chaudhary
- Department of Chemistry, Division of Applied Physical Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
| | - Ricardo M F Fernandes
- Department of Chemistry, Division of Applied Physical Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden; Centro de Investigação em Química, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, s/n, P-4169-007 Porto, Portugal.
| | - Vasantha Gowda
- Department of Chemistry, Division of Applied Physical Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Mireille M A E Claessens
- MESA + Institute for Nanotechnology and Mira Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500AE Enschede, the Netherlands
| | - István Furó
- Department of Chemistry, Division of Applied Physical Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Christofer Lendel
- Department of Chemistry, Division of Applied Physical Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
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10
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Fernandes RMF, Dai J, Regev O, Marques EF, Furó I. Block Copolymers as Dispersants for Single-Walled Carbon Nanotubes: Modes of Surface Attachment and Role of Block Polydispersity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13672-13679. [PMID: 30335395 DOI: 10.1021/acs.langmuir.8b02658] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
When using amphiphilic polymers to exfoliate and disperse carbon nanotubes in water, the balance between the hydrophobic and hydrophilic moieties is critical and nontrivial. Here, we investigate the mode of surface attachment of a triblock copolymer, Pluronics F127, composed of a central hydrophobic polypropylene oxide block flanked by hydrophilic polyethylene oxide blocks, onto single-walled carbon nanotubes (SWNTs). Crucially, we analyze the composition in dispersant of both the as-obtained dispersion (the supernatant) and the precipitate-containing undispersed materials. For this, we combine the carefully obtained data from 1H NMR peak intensities and self-diffusion and thermogravimetric analysis. The molecular motions behind the observed NMR features are clarified. We find that the hydrophobic blocks attach to the dispersed SWNT surface and remain significantly immobilized leading to 1H NMR signal loss. On the other hand, the hydrophilic blocks remain highly mobile and thus readily detectable by NMR. The dispersant is shown to possess significant block polydispersity that has a large effect on dispersibility. Polymers with large hydrophobic blocks adsorb on the surface of the carbonaceous particles that precipitate, indicating that although a larger hydrophobic block is good for enhancing adsorption, it may be less effective in dispersing the tubes. A model is also proposed that consistently explains our observations in SWNT dispersions and some contradicting findings obtained previously in carbon nanohorn dispersions. Overall, our findings help elucidating the molecular picture of the dispersion process for SWNTs and are of interest when looking for more effective (i.e., well-balanced) polymeric dispersants.
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Affiliation(s)
- Ricardo M F Fernandes
- Division of Applied Physical Chemistry, Department of Chemistry , KTH Royal Institute of Technology , SE-10044 Stockholm , Sweden
- CIQUP, Department of Chemistry and Biochemistry, Faculty of Sciences , University of Porto , P-4169-007 Porto , Portugal
| | - Jing Dai
- Division of Applied Physical Chemistry, Department of Chemistry , KTH Royal Institute of Technology , SE-10044 Stockholm , Sweden
| | - Oren Regev
- Department of Chemical Engineering and the Ilse Katz Institute for Nanotechnology , Ben-Gurion University of Negev , 84105 Beer-Sheva , Israel
| | - Eduardo F Marques
- CIQUP, Department of Chemistry and Biochemistry, Faculty of Sciences , University of Porto , P-4169-007 Porto , Portugal
| | - István Furó
- Division of Applied Physical Chemistry, Department of Chemistry , KTH Royal Institute of Technology , SE-10044 Stockholm , Sweden
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11
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Matsuura Y, Ouchi N, Banno H, Nakamura A, Kato H. Accurate size determination of polystyrene latex nanoparticles in aqueous media using a particle tracking analysis method. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.04.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Kato H, Nakamura A, Shimizu M, Banno H, Kezuka Y, Matsubara K, Hosoi K, Yoshida S, Fujimoto T. Acceleration of dispersing calcium carbonate particle in aqueous media using jet milling method. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.02.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Suttipong M, Grady BP, Striolo A. Surfactants adsorption on crossing stripes and steps. SOFT MATTER 2017; 13:862-874. [PMID: 28074204 DOI: 10.1039/c6sm01854h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Using coarse-grained dissipative particle dynamics (DPD) simulations, we systematically study the effect of surface heterogeneity on surfactant adsorption. Here we investigate the adsorption and aggregation of surfactants on hydrophobic stripes crossing each other perpendicularly (i.e., crossing stripes) and on hydrophobic steps. The results are compared with those obtained for isolated stripes. We find that on crossing stripes of moderate stripe widths (e.g., L = 0.61LS, 1.22LS and 1.83LS, where LS is the length of one surfactant molecule) the crossing region hinders the formation of defect-free adsorbed surfactant structures. By increasing the stripe width and/or by increasing the length of one of the two perpendicularly crossing stripes (i.e., lowering the surface density of defects/intersections), the crossing region is found to have a weaker effect on the features of the adsorbed structures. Regarding surfactant adsorption on steps, our simulation results show that the self-assembled aggregates can be stretched along the step corner, and the resultant elastic deformation can hinder adsorption. This qualitative observation can facilitate a description of surfactant adsorption that takes into consideration also the deformation of the self-assembled film. As suggested by such a general model, increasing the convex angle of the step, increasing the size of the surfactant head groups, and changing other physical parameters can reduce the elastic energy penalty, and yield larger amounts of surfactants adsorbed. The results presented could assist in understanding and sometimes predicting surfactant adsorption on heterogeneous surfaces, suggest methods to formulate surfactant mixtures to control surface coverage on heterogeneous surfaces, and perhaps facilitate new methods for the fabrication of nano-structured surfaces.
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Affiliation(s)
- Manaswee Suttipong
- Department of Chemical Engineering, University College London, London WC1E 7JE, UK.
| | - Brian P Grady
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73069, USA
| | - Alberto Striolo
- Department of Chemical Engineering, University College London, London WC1E 7JE, UK.
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14
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Zhou Y, Azumi R. Carbon nanotube based transparent conductive films: progress, challenges, and perspectives. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2016; 17:493-516. [PMID: 27877899 PMCID: PMC5111561 DOI: 10.1080/14686996.2016.1214526] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 07/13/2016] [Accepted: 07/15/2016] [Indexed: 05/23/2023]
Abstract
Developments in the manufacturing technology of low-cost, high-quality carbon nanotubes (CNTs) are leading to increased industrial applications for this remarkable material. One of the most promising applications, CNT based transparent conductive films (TCFs), are an alternative technology in future electronics to replace traditional TCFs, which use indium tin oxide. Despite significant price competition among various TCFs, CNT-based TCFs have good potential for use in emerging flexible, stretchable and wearable optoelectronics. In this review, we summarize the recent progress in the fabrication, properties, stability and applications of CNT-based TCFs. The challenges of current CNT-based TCFs for industrial use, in comparison with other TCFs, are considered. We also discuss the potential of CNT-based TCFs, and give some possible strategies to reduce the production cost and improve their conductivity and transparency.
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Affiliation(s)
- Ying Zhou
- Photonics and Electronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
| | - Reiko Azumi
- Photonics and Electronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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15
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Gatti T, Vicentini N, Mba M, Menna E. Organic Functionalized Carbon Nanostructures for Functional Polymer-Based Nanocomposites. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501411] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Devre RD, Budhlall BM, Barry CF. Enhancing the Colloidal Stability and Electrical Conductivity of Single-Walled Carbon Nanotubes Dispersed in Water. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500408] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rinky D. Devre
- Department of Plastics Engineering and NSF Center for High-Rate Nanomanufacturing; University of Massachusetts; Lowell MA 01854 USA
| | - Bridgette M. Budhlall
- Department of Plastics Engineering and NSF Center for High-Rate Nanomanufacturing; University of Massachusetts; Lowell MA 01854 USA
| | - Carol F. Barry
- Department of Plastics Engineering and NSF Center for High-Rate Nanomanufacturing; University of Massachusetts; Lowell MA 01854 USA
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17
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Alston JR, Banks DJ, McNeill CX, Mitchell JB, Popov LD, Shcherbakov IN, Poler JC. Adsorption studies of divalent, dinuclear coordination complexes as molecular spacers on SWCNTs. Phys Chem Chem Phys 2015; 17:29566-73. [PMID: 26457656 DOI: 10.1039/c5cp05419b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In order to enhance the electrical energy storage capabilities of nanostructured carbon materials, inter-particle spacer strategies are needed to maintain ion-accessible surface area between the nanoparticles. This paper presents a comparison between different classes of divalent, dinuclear coordination complexes which both show strong adsorption to SWCNTs and have molecular spacer properties that maintain electrochemical activity. We find that a novel, dinuclear zinc hydrazone complex binds as an ion-pair at very high loading while not inducing significant aggregation as compared to our previously studies of dinuclear ruthenium complexes. These conclusions are supported by conductivity and dispersion stability data. Moreover, since zinc is an earth abundant metal, these complexes can be used as components in sustainable energy storage materials. Binding kinetics and binding equilibrium data are presented. Modeling of the adsorption isotherm is best fit with the BET model. Kinetics data support an independent binding model. Preliminary capacitance and membrane resistance data are consistent with the complexes acting as molecular spacers between the SWCNTs in a condensed thin film.
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Affiliation(s)
- Jeffrey R Alston
- Department of Chemistry, University of North Carolina at Charlotte, Charlotte, NC, USA.
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18
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Hu Z, Zhao J, Song Z, Yang C. Filled and peptide-modified single-walled carbon nanotubes: synthesis, characterization, and in vitro test for cancer cell targeting. RSC Adv 2015. [DOI: 10.1039/c4ra17047d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Multi-functional single-walled carbon nanotubes (SWNTs) with metal endohedral filling and a high degree of polycarboxylation on the sidewalls were synthesized without affecting the SWNTσ-framework.
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Affiliation(s)
- Zhiyuan Hu
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- China
- Department of Applied Chemistry
| | - Jingjing Zhao
- Department of Chemical Engineering and Technology
- Beijing University of Chemical Technology
- Beijing, 100029
- China
| | - Zhaozheng Song
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- China
| | - Chunpeng Yang
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- China
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Kato H, Nakamura A, Horie M. Acceleration of suspending single-walled carbon nanotubes in BSA aqueous solution induced by amino acid molecules. J Colloid Interface Sci 2014; 437:156-162. [PMID: 25313479 DOI: 10.1016/j.jcis.2014.09.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Revised: 09/02/2014] [Accepted: 09/09/2014] [Indexed: 02/04/2023]
Abstract
Single-walled carbon nanotube (SWCNT) suspensions in aqueous media were prepared using bovine serum albumin (BSA) and amino acid molecules. It was found that the amino acid molecules clearly decreased the time required for suspending the SWCNTs in BSA aqueous solutions. Dynamic light scattering measurements revealed that the particle sizes of the SWCNTs suspended in aqueous media with and without amino acid molecules were approximately the same and stable for more than one week. The zeta potential values of the BSA molecules in pure water and amino acid aqueous solutions were different, and these values were also reflected in the surface potential of colloidal SWCNT particles in the corresponding aqueous media, thus inducing different dispersibility of SWCNTs in aqueous media. Pulsed field gradient nuclear magnetic resonance measurements showed that the interactions between the SWCNTs and the amino acid molecules are weak and comprise chemical exchange interactions and not bonding interactions. Amino acid molecules play a fascinating role in the preparation of SWCNT suspensions in BSA aqueous media by increasing electrostatic repulsive interactions between SWCNT colloidal particles and consequently enhancing the dispersion ability of the BSA molecules.
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Affiliation(s)
- Haruhisa Kato
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan.
| | - Ayako Nakamura
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
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