Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7229134 | Biosensors and Bioelectronics | 2018 | 20 Pages |
Abstract
Using one-step anodization strategy, a nanoporous gold film (HNPG) with large surface area was rapidly fabricated on Au80Sn20 (wt%) alloy in just 80â¯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 AuCl4ï¼species at the applied anodic potential. As-prepared HNPG/AuSn shows enhanced electrochemical performance for glucose oxidation in alkaline electrolyte. At a low potential of 0.1â¯V (vs. SCE), it offers a short response time of 4â¯s, a wide linear detection range of 2â¯Î¼M to 8.11â¯mM, an ultralow detection limit of 0.36â¯Î¼M (S/Nâ¯=â¯3), an ultrahigh sensitivity of 4374.6â¯Î¼Aâ¯cmâ2 mMâ1, 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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Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yuanjiao Pei, Ming Hu, Feihui Tu, Xueyong Tang, Wei Huang, Shu Chen, Zelin Li, Yue Xia,