Construction of Au nanoparticles on choline chloride modified glassy carbon electrode for sensitive detection of nitrite.
Construction of Au nanoparticles on choline chloride modified glassy carbon electrode for sensitive detection of nitrite.
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DOI：
10.1016/j.bios.2009.04.006
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发表时间：
2009-07
影响因子：
12.6
通讯作者：
Po Wang;Zhibin Mai;Zong Dai;Yongxin Li;Xiaoyong Zou
中科院分区：
文献类型：
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作者：
Po Wang;Zhibin Mai;Zong Dai;Yongxin Li;Xiaoyong Zou
将Au纳米粒子修饰于氯化胆碱（Ch）修饰玻碳电极（GCE）表面，制备了一种具有良好应用前景的亚硝酸根电化学传感器。采用场发射扫描电子显微镜、粉末X射线衍射、X射线光电子能谱和电化学技术对修饰电极的表面进行了表征。结果表明，Ch共价固定在GCE表面形成种植Ch单分子层，这可以为Au纳米粒子的构建提供合适的支撑材料。结果表明，平均粒径约为110 nm的Au纳米粒子在Ch单分子膜表面组装成花状结构。均匀的纳米Au/Ch膜对亚硝酸根的氧化具有显著的电催化活性，过电位明显降低。在最佳条件下，亚硝酸根的线性范围为4.0×10− 7 ~ 7.5×10− 4 M，灵敏度为0.354μAμM−1，检出限为1.0×10− 7 M。该方法成功地应用于水样和香肠样品中亚硝酸盐的测定，结果与离子色谱法和紫外可见分光光度法一致。
A promising electrochemical sensor for sensitive determination of nitrite was fabricated by construction of Au nanoparticles on the surface of choline chloride (Ch) modified glassy carbon electrode (GCE). Field emission scanning electron microscope, powder X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical techniques were used for the surface characterization of the modified electrode. It was demonstrated that Ch was covalently immobilized onto the GCE surface forming a planted Ch monolayer, which could provide a suitable supporting material for the construction of Au nanoparticles. As a result, the Au nanoparticles with average size of about 110nm were assembled to form a flowerlike structure on the surface of Ch monolayer. Moreover, the uniform nano-Au/Ch film exhibited remarkable electrocatalytic activity towards the oxidation of nitrite with obvious reduction of overpotential. Under the optimum conditions, the linear range for the detection of nitrite was 4.0×10−7to 7.5×10−4M with a high sensitivity of 0.354μAμM−1, and a low detection limit of 1.0×10−7M. The proposed method was successfully applied in the detection of nitrite in water samples and sausage samples, and the results were consistent with those obtained by ion chromatography and UV–visible spectrophotometric methods.