期刊
BIOSENSORS & BIOELECTRONICS
卷 117, 期 -, 页码 758-765出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.07.021
关键词
Nanoporous gold; Nonenzymatic glucose sensors; AuSn alloy; Anodization
类别
资金
- National Natural Science Foundation of China [21403063, 81704091]
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China)
- Hunan Normal University
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Construct Program of the Key Discipline in Hunan Province
Using one-step anodization strategy, a nanoporous gold film (HNPG) with large surface area was rapidly fabricated on Au80Sn20 (wt%) alloy in just 80 s. The formation of highly surface-roughened nanoporous structures results from a complex process of electrochemical dealloying of Sn component from AuSn alloy, anodic electrodissolution, disproportion and deposition of Au component, and spontaneous redox reaction between electrodissolved Sn2+ and AuCl4- species at the applied anodic potential. As-prepared HNPG/AuSn shows enhanced electrochemical performance for glucose oxidation in alkaline electrolyte. At a low potential of 0.1 V (vs. SCE), it offers a short response time of 4 s, a wide linear detection range of 2 mu M to 8.11 mM, an ultralow detection limit of 0.36 mu M (S/N = 3), an ultrahigh sensitivity of 4374.6 mu A cm(-2) mM(-1), and satisfactory selectivity and reproducibility. Specifically, after 6 weeks, no obvious loss of glucose amperometric signal was observed on HNPG/AuSn. The facile preparation and excellent sensing performance of HNPG/AuSn electrode make sure that it is a promising candidate for advanced enzyme-free glucose sensors.
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