Journal
ELECTROCHIMICA ACTA
Volume 90, Issue -, Pages 550-555Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.12.068
Keywords
Hydrogen peroxide; Nonenzymatic; Graphene; Azure I; Au nanoparticles
Categories
Funding
- Youth Fund of Yunnan University of Nationalities [QN0901]
- Students' Innovation Experimental Plan of Yunnan University of Nationalities [2009HSCX07]
- Open Fund of Key Laboratory of Chemistry in Ethnic Medicinal Resources [MZY100102]
- Yunnan Department of Education [2011Z007]
- Department of Science and Technology [2011FZ171]
- National Natural Science Foundation of China [21205104]
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A novel nonenzymatic hydrogen peroxide sensor was developed using graphene/Nafion/azure I/Au nanoparticles composites modified glass carbon electrode (graphene/Nafion/AzI/AuNPs/GCE). The method of preparation of graphene/Nafion/AzI/AuNPs composite was simple and it was characterized by SEM. Cyclic voltammetry demonstrated that the direct electron transfer of redox molecule, Azure I, was realized, and the sensor had an excellent performance in terms of electrocatalytic reduction toward hydrogen peroxide (H2O2). The sensor showed high sensitivity and fast response upon the addition of H2O2, under the conditions of pH 4.0, potential -0.2 V. The time to reach the stable-state current was less than 3 s, and the linear range to H2O2 was from 30 mu M to 5 mM with a detection limit of 10 mu M (S/N = 3). Moreover, the sensor exhibited good reproducibility and long-term stability. (c) 2012 Elsevier Ltd. All rights reserved.
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