期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 23, 页码 12719-12730出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03401
关键词
Cu-Cu2O nanoparticles; TiO2 nanotube arrays; sensor; nonenzymatic electro-oxidation of glucose; electrochemical impedance spectroscopy
资金
- National Natural Science Foundation of China [51374250]
- Hunan Provincial Natural Science Foundation for Innovative Research Groups [2013-02]
A novel Cu-Cu2O/TiO2/Ti electrode for the nonenzymatic electro-oxidation of glucose has been fabricated by secondary anodic oxidation combined with the electro-deposition method. It represents a new type of copper oxide TiO2 complex nanostructure that demonstrates a new application. At the potential range from -1.0 to -1.6 V, Cu2+ was electrochemically reduced to Cu2O, accompanied by the simultaneous formation of Cu covering the top surface of the TiO2 nanotubes. The highest response current was obtained at the optimized fabrication conditions with a deposition charge of 1.5 C, a pH of 12, 4 mM CuSO4, and a deposition potential of -1.4 V. The results indicate that Cu2O helps to keep a broad linear range, and the incorporation of Cu nanoparticles improves the response current and sensitivity. The linearity between the response current and the glucose concentration was obtained in the range from 0.1 to 2.5 mM with a sensitivity of 4895 mu A cm(-2) mM(-1). Such high sensitivity was attributed to the synergistic effect of the small Cu-Cu2O grain size and the large surface area of the helical TiO2 nanotube arrays as well as the fast electron transfer. Electrochemical impedance spectroscopy has been successfully applied to explain the differences among different electrode interfaces and the change rule of nonenzymatic electro-oxidation properties.
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