Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode
Chemically-modified electrode fabricated by mechanical attachment of multi-walled carbon nanotubes/tungsten oxide (MWCNTs/WO3) in the electrocatalytic study of dopamine was investigated. The MWCNTs/WO3 nanocomposite has been characterized using voltammetric techniques of cyclic voltammetry, chronoam...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Research India Publications
2017
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| Online Access: | http://psasir.upm.edu.my/id/eprint/63696/1/Voltammetric%20determination%20of%20dopamine%20mediated%20by%20nanoparticle%20WO3.pdf |
| _version_ | 1825932643864150016 |
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| author | Lim, Alvin Teik Zheng Ando, Yoshito Zawawi, Ruzniza Mohd |
| author_facet | Lim, Alvin Teik Zheng Ando, Yoshito Zawawi, Ruzniza Mohd |
| author_sort | Lim, Alvin Teik Zheng |
| collection | UPM |
| description | Chemically-modified electrode fabricated by mechanical attachment of multi-walled carbon nanotubes/tungsten oxide (MWCNTs/WO3) in the electrocatalytic study of dopamine was investigated. The MWCNTs/WO3 nanocomposite has been characterized using voltammetric techniques of cyclic voltammetry, chronoamperometry and chronocoulometry. The CNT/WO3/GCE induces a 2.9 enhancement oxidative peak with peak separation of approximately 200 mV, shifting towards a lower potential in the electrochemical oxidation of 0.4 mM dopamine at pH 7.0, in comparison with the WO3/GCE, MWCNTs/GCE and bare GCE. The lowering positive potential and enhancement current are evident of electrocatalysis process. From the calibration plot, the high sensitivity response of 57.00 μA/μM for the anodic peak with the detection limit of 0.018 μM (100 mV/s scan rate) of dopamine at the CNT/WO3/GCE were obtained. Based on the chronocoulometric study on 0.4 mM dopamine in 0.1 M KCl, the diffusion coefficient was found to be 5.43 x 10-8 cm2/s with the surface charge of 6.86 x 10-4 C/cm2. The easily prepared nanocomposite-modified electrode showed to have high sensitivity, selectivity and good reproducibility. |
| first_indexed | 2024-03-06T09:45:11Z |
| format | Article |
| id | upm.eprints-63696 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:45:11Z |
| publishDate | 2017 |
| publisher | Research India Publications |
| record_format | dspace |
| spelling | upm.eprints-636962018-11-30T04:07:41Z http://psasir.upm.edu.my/id/eprint/63696/ Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode Lim, Alvin Teik Zheng Ando, Yoshito Zawawi, Ruzniza Mohd Chemically-modified electrode fabricated by mechanical attachment of multi-walled carbon nanotubes/tungsten oxide (MWCNTs/WO3) in the electrocatalytic study of dopamine was investigated. The MWCNTs/WO3 nanocomposite has been characterized using voltammetric techniques of cyclic voltammetry, chronoamperometry and chronocoulometry. The CNT/WO3/GCE induces a 2.9 enhancement oxidative peak with peak separation of approximately 200 mV, shifting towards a lower potential in the electrochemical oxidation of 0.4 mM dopamine at pH 7.0, in comparison with the WO3/GCE, MWCNTs/GCE and bare GCE. The lowering positive potential and enhancement current are evident of electrocatalysis process. From the calibration plot, the high sensitivity response of 57.00 μA/μM for the anodic peak with the detection limit of 0.018 μM (100 mV/s scan rate) of dopamine at the CNT/WO3/GCE were obtained. Based on the chronocoulometric study on 0.4 mM dopamine in 0.1 M KCl, the diffusion coefficient was found to be 5.43 x 10-8 cm2/s with the surface charge of 6.86 x 10-4 C/cm2. The easily prepared nanocomposite-modified electrode showed to have high sensitivity, selectivity and good reproducibility. Research India Publications 2017 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/63696/1/Voltammetric%20determination%20of%20dopamine%20mediated%20by%20nanoparticle%20WO3.pdf Lim, Alvin Teik Zheng and Ando, Yoshito and Zawawi, Ruzniza Mohd (2017) Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode. International Journal of Applied Chemistry, 13 (4). 899 - 912. ISSN 0973-1792; ESSN: 0973-9734 |
| spellingShingle | Lim, Alvin Teik Zheng Ando, Yoshito Zawawi, Ruzniza Mohd Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode |
| title | Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode |
| title_full | Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode |
| title_fullStr | Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode |
| title_full_unstemmed | Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode |
| title_short | Voltammetric determination of dopamine mediated by nanoparticle WO3/MWCNT modified glassy carbon electrode |
| title_sort | voltammetric determination of dopamine mediated by nanoparticle wo3 mwcnt modified glassy carbon electrode |
| url | http://psasir.upm.edu.my/id/eprint/63696/1/Voltammetric%20determination%20of%20dopamine%20mediated%20by%20nanoparticle%20WO3.pdf |
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