A novel electrochemical sensor based on gold nanorods and Nafion-modified GCE for the electrocatalytic oxidation of nitrite

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• 作者：Dejiang Rao ; Jian Zhang ; Jianbin Zheng
• 关键词：Electrochemical sensor ; Gold nanorods ; Seed ; mediated protocol ; Electrocatalysis ; Nitrite
• 刊名：Journal of the Iranian Chemical Society
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：13
• 期：12
• 页码：2257-2266
• 全文大小：1,027 KB
• 刊物主题：Analytical Chemistry; Inorganic Chemistry; Physical Chemistry; Biochemistry, general; Organic Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1735-2428
• 卷排序：13

文摘

The high-quality CTAB-stabilized gold nanorods (Au NRs) were prepared by the way of seed-mediated protocol. The microstructure and composition of the Au NRs were identified by transmission electron microscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and UV–visible spectroscopy. Further, a novel non-enzymatic electrochemical sensor of nitrite based on Au NRs–Nafion-modified glassy carbon electrode (GCE) was successfully developed. Under the optimum experimental conditions, the electrochemical behaviors of nitrite on the Au NRs–Nafion-modified GCE were systematically studied by electrochemical impedance spectroscopy, cyclic voltammetry and chronoamperometry. The electrochemical investigations indicated that the Au NRs–Nafion-modified GCE had a wide linear range of 3.0 × 10−6–6.0 × 10−3 mol L−1, an acceptable sensitivity of 130.9 ± 0.05 μA mM−1 cm−2, a fast response time of 3 s and a low detection limit of 0.64 ± 0.02 μmol L−1 at the signal-to-noise ratio of 3 (S/N = 3). Additionally, the electrochemical sensor also showed good stability and favorable anti-interference capability for the detection of nitrite.