Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7834370 | Applied Surface Science | 2018 | 24 Pages |
Abstract
The NiO/Nitrogen doped carbon sphere (NiO/NCS) composites were successfully achieved via an easy one pot synthetic method with urea acting as both nitrogen source and Ni precipitator. The electrocatalytic performances of the obtained NiO/NCS modified glass carbon electrodes showed superior activity for direct electrocatalytic oxidation of glucose than that of nitrogen free NiO/carbon sphere (NiO/CS), which might be due to the synergistic effect of the properties of NCS and NiO nanoparticles. The introduce of nitrogen can improve the conductivity of the NiO/NCS and accordingly accelerate the electron transport within the composites, which was very beneficial to improve the sensitivity to glucose detection for NiO/NCS modified electrodes. The NiO/NCS electrodes exhibited two corresponding linear regions of 1-800â¯Î¼M and 4-9â¯mM with the sensitivity of 398.57â¯Î¼Aâ¯mMâ1â¯cmâ2 and 17.81â¯Î¼Aâ¯mMâ1â¯cmâ2, and the detection limit of 0.25â¯Î¼M and 0.05â¯mM respectively. Moreover, the NiO/NCS composites have also exhibited good selectivity by adding certain amount of urea, NaCl, l-proline, l-valine, l-Leucine and ascorbic acid into the 0.1â¯M NaOH solution, respectively. The high sensitivity, wide glucose detection range and good selectivity of the electrodes may ensure its potential applications in the clinical diagnosis of diabetes.
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Authors
Jiajie Zhu, Haoyong Yin, Jianying Gong, M.S.H. Al-Furjan, Qiulin Nie,