Synthesis and Ag-content-depended electrochemical properties of Ag/ZnO heterostructured nanomaterials

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• 作者：Xiumei Feng ; Yanfang Cheng ; Cui Ye ; Jianshan Ye ; ^{jsye@scut.edu.cn} ; Junying Peng ; Jianqiang Hu ; ^{jqhusc@scut.edu.cn}
• 关键词：Silver/zinc oxide heterostructure ; Nanoparticles ; Synthesis ; Biomaterials ; Sensors ; Electrochemical property
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July, 2012
• 卷：79
• 期：Complete
• 页码：205-208
• 文件大小：566 K

摘要

Ag/ZnO core/shell heterostructured nanomaterials were for the first time synthesized by Ag nanoparticle-mediated method, using which a novel hydrogen peroxide biosensor could be constructed. TEM and XRD measurements revealed that the Ag/ZnO heterojunctions were successfully acquired. Moreover, their sizes and shapes depended on Ag nanoparticles concentrations (i.e., Ag/ZnO-1, Ag/ZnO-2, and Ag/ZnO-3 heterojunctions were prepared using one-, two-, and three-fold Ag nanoparticles, respectively). Electrochemical measurements indicated that electrochemical properties of the Ag/ZnO-x-based biosensors also associated with the Ag nanoparticle content and the Hb-Nafion-Ag/ZnO-2 biosensor had the best electrochemical property, strongest redox peak currents and smallest 螖Ep of about 40 mV. Moreover, the Ag/ZnO-2-based biosensor displayed excellent electrocatalytic properties such as wide linear range (2-540 渭M), high sensitivity (83 mA cm^鈭?#xA0;2 mol^鈭?#xA0;1), low detection limit (0.18 渭M), and good stability and reproducibility.