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Arrays of nanofibers composed of a TiC core and a carbon coating for sensitive electrochemical detection of hydrazine |
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| Authors: | Wenrui Zhang Kaifu Huo Yulong Jiang Liangsheng Hu Rongsheng Chen Paul K Chu |
| Institution: | 2. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China 1. ASIC and System State Key Laboratory, Department of Microelectronics, Fudan University, Shanghai, 200433, China 3. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China |
| Abstract: | Arrays made from quasi-aligned nanofibers consisting of a TiC/C composite were produced directly on a titanium alloy substrate by a thermochemical process. Their morphology, structure and composition were characterized by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The arrays were directly utilized as an electrode without further treatment and display high catalytic activity in terms of hydrazine oxidation. The low overpotential decreases gradually when increasing pH values from 5 to 10. The detection range is linear from 0.1 to 1,635???M concentrations, and the detection limit is as low as 0.026???M (S/N?=?3). The selectivity of the electrode and its general performance and stability are very good. The improved electrochemical properties of the new electrode are attributed to the synergic effect of the highly conducting TiC nanowire core and an abundant amount of edge-plane-like defects on the carbon shells. Quasi-alinged core-shell TiC/C nanofiber arrays were produced by a simple thermochemical method. The nanofiber arrays display electrocatalytic activity towards oxidation of hydrazine with a wide linear range and a very low detection limit of 0.026???M (S/N?=?3). |
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