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A glassy carbon electrode modified with the nickel(II)-bis(1,10-phenanthroline) complex and multi-walled carbon nanotubes, and its use as a sensor for ascorbic acid |
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| Authors: | Xin Liu Xi Li Yan Xiong Qimei Huang Xiaoyu Li Yulin Dong Peng Liu Chaocan Zhang |
| Institution: | 1. Department of Chemistry, School of Science, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China 2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China |
| Abstract: | A glassy carbon electrode (GCE) was modified with the nickel(II)-bis(1,10-phenanthroline) complex and with multi-walled carbon nanotubes (MWCNTs). The nickel complex was electrodeposited on the MWCNTs by cyclic voltammetry. The modified GCE displays excellent electrocatalytic activity to the oxidation of ascorbic acid (AA). The effects of fraction of MWCNTs, film thickness and pH values were optimized. Response to AA is linear in the 10 to 630 μM concentration range, and the detection limit is 4 μM (at a signal-to-noise ratio of 3:1). The modified electrode was applied to determine AA in vitamin C tablets and in spiked fruit juice. A simple and sensitive ascorbic acid electrochemical sensor was fabricated by electrodepositing of nickel complex onto multi-walled carbon nanotubes/glassy carbon electrode. The sensor has high selectivity, rapid current response, is easy to construct and can be utilized for ascorbic acid determination. |
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