Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode.
A MWCNT/TiO2 composite was modified onto glassy carbon electrode and fabricated by mechanical attachment, then applied to detection of ascorbic acid using cyclic voltammetry. Electrode responses were obtained for the oxidation of 0.5 mM ascorbic acid at the glassy carbon electrode modified with MWCN...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Asian Network for Scientific Information
2011
|
| Online Access: | http://psasir.upm.edu.my/id/eprint/24774/1/Voltammetric%20oxidation%20of%20ascorbic%20acid%20mediated%20by%20multi.pdf |
| _version_ | 1796970627037396992 |
|---|---|
| author | Perenlei, Ganchimeg Tan, Wee Tee Yusof, Nor Azah Goh, Joo Kheng |
| author_facet | Perenlei, Ganchimeg Tan, Wee Tee Yusof, Nor Azah Goh, Joo Kheng |
| author_sort | Perenlei, Ganchimeg |
| collection | UPM |
| description | A MWCNT/TiO2 composite was modified onto glassy carbon electrode and fabricated by mechanical attachment, then applied to detection of ascorbic acid using cyclic voltammetry. Electrode responses were obtained for the oxidation of 0.5 mM ascorbic acid at the glassy carbon electrode modified with MWCNT, TiO2, MWCNT/TiO2 composite and an unmodified glassy carbon electrode. A well-defined and highly resolved oxidation peak of ascorbic acid at the MWCNT/TiO2/GCE with current enhancement and peak potential shift toward the origin being observed, this indicates evidence of electrocatalytic process. In comparison with other electrodes, the observed current enhancements at the MWCNT/TiO2/GCE were 1.3 folds higher than those obtained by MWCNT/GCE and 1.5 folds by a bare glassy carbon electrode. The response peak current revealed a good linear relationship of up to 2.5 mM ascorbic acid with correlation coefficient of 0.998. A good detection limit of 4.0 μM was found using MWCNT/TiO2/GCE. Other usual parameters such as effect of pH, scan rate, temperature, supporting electrolyte and concentration of ascorbic acid were studied. |
| first_indexed | 2024-03-06T08:00:51Z |
| format | Article |
| id | upm.eprints-24774 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T08:00:51Z |
| publishDate | 2011 |
| publisher | Asian Network for Scientific Information |
| record_format | dspace |
| spelling | upm.eprints-247742015-10-28T09:01:26Z http://psasir.upm.edu.my/id/eprint/24774/ Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. Perenlei, Ganchimeg Tan, Wee Tee Yusof, Nor Azah Goh, Joo Kheng A MWCNT/TiO2 composite was modified onto glassy carbon electrode and fabricated by mechanical attachment, then applied to detection of ascorbic acid using cyclic voltammetry. Electrode responses were obtained for the oxidation of 0.5 mM ascorbic acid at the glassy carbon electrode modified with MWCNT, TiO2, MWCNT/TiO2 composite and an unmodified glassy carbon electrode. A well-defined and highly resolved oxidation peak of ascorbic acid at the MWCNT/TiO2/GCE with current enhancement and peak potential shift toward the origin being observed, this indicates evidence of electrocatalytic process. In comparison with other electrodes, the observed current enhancements at the MWCNT/TiO2/GCE were 1.3 folds higher than those obtained by MWCNT/GCE and 1.5 folds by a bare glassy carbon electrode. The response peak current revealed a good linear relationship of up to 2.5 mM ascorbic acid with correlation coefficient of 0.998. A good detection limit of 4.0 μM was found using MWCNT/TiO2/GCE. Other usual parameters such as effect of pH, scan rate, temperature, supporting electrolyte and concentration of ascorbic acid were studied. Asian Network for Scientific Information 2011 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/24774/1/Voltammetric%20oxidation%20of%20ascorbic%20acid%20mediated%20by%20multi.pdf Perenlei, Ganchimeg and Tan, Wee Tee and Yusof, Nor Azah and Goh, Joo Kheng (2011) Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. Journal of Applied Sciences, 11 (5). pp. 848-854. ISSN 1812-5654; ESSN: 1812-5662 http://www.scialert.net/jindex.php?issn=1812-5654 10.3923/jas.2011.848.854 |
| spellingShingle | Perenlei, Ganchimeg Tan, Wee Tee Yusof, Nor Azah Goh, Joo Kheng Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. |
| title | Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. |
| title_full | Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. |
| title_fullStr | Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. |
| title_full_unstemmed | Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. |
| title_short | Voltammetric oxidation of ascorbic acid mediated by multi-walled carbon nanotubes/titanium dioxide composite modified glassy carbon electrode. |
| title_sort | voltammetric oxidation of ascorbic acid mediated by multi walled carbon nanotubes titanium dioxide composite modified glassy carbon electrode |
| url | http://psasir.upm.edu.my/id/eprint/24774/1/Voltammetric%20oxidation%20of%20ascorbic%20acid%20mediated%20by%20multi.pdf |
| work_keys_str_mv | AT perenleiganchimeg voltammetricoxidationofascorbicacidmediatedbymultiwalledcarbonnanotubestitaniumdioxidecompositemodifiedglassycarbonelectrode AT tanweetee voltammetricoxidationofascorbicacidmediatedbymultiwalledcarbonnanotubestitaniumdioxidecompositemodifiedglassycarbonelectrode AT yusofnorazah voltammetricoxidationofascorbicacidmediatedbymultiwalledcarbonnanotubestitaniumdioxidecompositemodifiedglassycarbonelectrode AT gohjookheng voltammetricoxidationofascorbicacidmediatedbymultiwalledcarbonnanotubestitaniumdioxidecompositemodifiedglassycarbonelectrode |