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Amperometric sensor for ascorbic acid based on a glassy carbon electrode modified with gold-silver bimetallic nanotubes in a chitosan matrix |
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| Authors: | Penghao Yang Xia Gao Lisha Wang Qi Wu Zhichun Chen Xianfu Lin |
| Affiliation: | 1. Department of Chemistry, Zhejiang University, Hangzhou, 310027, People’s Republic of China |
| Abstract: | We report on an amperometric sensor for ascorbic acid (AA) that is based on highly dense gold-silver nanotubes in a chitosan film on a glassy carbon electrode. The nanotubes were synthesized by a poly(vinyl pyrrolidone)-mediated polyol method employing a replacement reaction with silver nanowires as templates, and were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Under the optimal conditions, the sensor exhibits good electrocatalytic activity towards the oxidation of AA, and this enables the determination of AA in the 5 μM to 2 mM concentration range, with a detection limit at 2 μM (at an S/N of 3). The response time is 2 s. The sensor displays good reproducibility, selectivity, sensitivity, and long-term stability. In this paper, an amperometric electrochemical sensor for detection of ascorbic acid was fabricated based on highly dense gold-silver nanotubes and chitosan film. The biosensor showed good reproducibility, anti-interferant ability, high sensitivity, low detection limit, fast response, and long-term stability. |
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