Electrochemical detection of L-cysteine using a glassy carbon electrode modified with a two-dimensional composite prepared from platinum and Fe<sub class="a-plus-plus">3sub>O<sub class="a-plus-plus">4sub> nanoparticles on reduced graphene oxide

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• 作者：Yuqiao Wang ; Wei Wang ; Gaofeng Li ; Qin Liu ; Tao Wei ; Baosong Li…
• 关键词：Magnetite nanoparticles ; Cyclic voltammetry ; Amperometry ; Double potential step chronoamperometry ; Kinetics
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：183
• 期：12
• 页码：3221-3228
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Nanochemistry; Nanotechnology; Characterization and Evaluation of Materials; Analytical Chemistry; Microengineering;
• 出版者：Springer Vienna
• ISSN：1436-5073
• 卷排序：183

文摘

We report on an electrochemical sensor for L-cysteine that consists of a glassy carbon electrode modified with a two-dimensional ternary nanocomposite prepared from platinum, magnetite, and reduced graphene oxide (referred to as Pt-Fe<sub>3sub>O<sub>4sub>/rGO). It was prepared by a solvothermal method and characterized by X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Electrochemical detection processes were investigated by cyclic voltammetry, amperometry, double potential step chronoamperometry and differential pulse voltammetry. The diffusion coefficient (7.41 × 10−7 cm2 s−1) and reaction rate constant (9.96 × 107 cm3 mol−1 s−1) were calculated via the Cottrell equation. The sensor, best operated in 0.1 M NaOH solution at a working voltage of 0.65 V vs. SCE, has a 10 μM detection limit and an analytical range that extends from 0.10 to 1.0 mM. The method is acceptably selective, stable, repeatable and reproducible due to the synergistic effect of the various components applied. The detection limit is 1.0 × 10−5 M.