Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions
Quantitative analysis was performed on voltammetric data obtained from surface-modified electrodes that were prepared with functionalised carbon nanotubes (fCNTs) consisting of functionalised single-walled carbon nanotubes (fSWCNTs) and functionalised multi-walled carbon nanotubes (fMWCNTs). In orde...
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/154258 |
| _version_ | 1826121899710611456 |
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| author | Tham, Guo Xiong Fisher, Adrian C. Webster, Richard David |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Tham, Guo Xiong Fisher, Adrian C. Webster, Richard David |
| author_sort | Tham, Guo Xiong |
| collection | NTU |
| description | Quantitative analysis was performed on voltammetric data obtained from surface-modified electrodes that were prepared with functionalised carbon nanotubes (fCNTs) consisting of functionalised single-walled carbon nanotubes (fSWCNTs) and functionalised multi-walled carbon nanotubes (fMWCNTs). In order to obtain the optimum coating procedure, the fCNTs were dispersed in individual solutions of N-methyl-2-pyrrolidone, N,N-dimethylformamide and ethanol (EtOH), and drop cast onto glassy carbon (GC) electrode surfaces to become the surface-modified electrodes. Different classes of surfactants (positive, negative and neutrally charged) at varying concentrations were tested in the bulk solution to see how they affected the dispersion properties of the fCNTs as well as how they influenced the experimental heterogeneous electron transfer rates (k0) measured via cyclic voltammograms (CVs) of the ferri-/ferrocyanide redox couple at the immersed film electrodes. The k0-values measured at the fSWCNT/GCE and fMWCNT/GCE film electrodes were compared and the results indicated that the type of fCNTs and the%wt of the fCNTs used in the dispersion did not affect the rates of heterogeneous electron transfer. The effect of increasing bulk surfactant concentration was examined to determine the optimum current responses with the lowest voltammetric peak-to-peak separation (ΔEpp) values for the film electrodes. Thin layer diffusion and semi-infinite diffusion processes were found to be dominant at slow and fast scan rates, respectively. |
| first_indexed | 2024-10-01T05:39:42Z |
| format | Journal Article |
| id | ntu-10356/154258 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:39:42Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1542582021-12-16T06:45:47Z Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions Tham, Guo Xiong Fisher, Adrian C. Webster, Richard David School of Physical and Mathematical Sciences Division of Chemistry and Biological Chemistry Science::Chemistry Voltammetry Surface-Modified Electrodes Quantitative analysis was performed on voltammetric data obtained from surface-modified electrodes that were prepared with functionalised carbon nanotubes (fCNTs) consisting of functionalised single-walled carbon nanotubes (fSWCNTs) and functionalised multi-walled carbon nanotubes (fMWCNTs). In order to obtain the optimum coating procedure, the fCNTs were dispersed in individual solutions of N-methyl-2-pyrrolidone, N,N-dimethylformamide and ethanol (EtOH), and drop cast onto glassy carbon (GC) electrode surfaces to become the surface-modified electrodes. Different classes of surfactants (positive, negative and neutrally charged) at varying concentrations were tested in the bulk solution to see how they affected the dispersion properties of the fCNTs as well as how they influenced the experimental heterogeneous electron transfer rates (k0) measured via cyclic voltammograms (CVs) of the ferri-/ferrocyanide redox couple at the immersed film electrodes. The k0-values measured at the fSWCNT/GCE and fMWCNT/GCE film electrodes were compared and the results indicated that the type of fCNTs and the%wt of the fCNTs used in the dispersion did not affect the rates of heterogeneous electron transfer. The effect of increasing bulk surfactant concentration was examined to determine the optimum current responses with the lowest voltammetric peak-to-peak separation (ΔEpp) values for the film electrodes. Thin layer diffusion and semi-infinite diffusion processes were found to be dominant at slow and fast scan rates, respectively. National Research Foundation (NRF) The authors are grateful to the National Research Foundation (NRF) Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) program and the Singapore Government MOE Academic Research Fund Tier 1 Grant (RG3/19) for funding. 2021-12-16T06:45:47Z 2021-12-16T06:45:47Z 2020 Journal Article Tham, G. X., Fisher, A. C. & Webster, R. D. (2020). Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions. Electrochimica Acta, 357, 136880-. https://dx.doi.org/10.1016/j.electacta.2020.136880 0013-4686 https://hdl.handle.net/10356/154258 10.1016/j.electacta.2020.136880 2-s2.0-85089338995 357 136880 en RG3/19 Electrochimica Acta © 2020 Elsevier Ltd. All rights reserved. |
| spellingShingle | Science::Chemistry Voltammetry Surface-Modified Electrodes Tham, Guo Xiong Fisher, Adrian C. Webster, Richard David Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| title | Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| title_full | Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| title_fullStr | Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| title_full_unstemmed | Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| title_short | Voltammetric studies on surface-modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| title_sort | voltammetric studies on surface modified electrodes with functionalised carbon nanotubes under different dispersion conditions |
| topic | Science::Chemistry Voltammetry Surface-Modified Electrodes |
| url | https://hdl.handle.net/10356/154258 |
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