期刊
MICROCHIMICA ACTA
卷 181, 期 1-2, 页码 231-238出版社
SPRINGER WIEN
DOI: 10.1007/s00604-013-1104-6
关键词
Ascorbic acid; Electrochemical sensor; Gold-silver nanotubes; Chitosan film
资金
- National Natural Science Foundation of China [30800247, 20805043]
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 mu M to 2 mM concentration range, with a detection limit at 2 mu M (at an S/N of 3). The response time is 2 s. The sensor displays good reproducibility, selectivity, sensitivity, and long-term stability.
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