A Self‐assembled L‐Cysteine and Electrodeposited Gold Nanoparticles‐reduced Graphene Oxide Modified Electrode for Adsorptive Stripping Determination of Copper,Electroanalysis

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A Self‐assembled L‐Cysteine and Electrodeposited Gold Nanoparticles‐reduced Graphene Oxide Modified Electrode for Adsorptive Stripping Determination of Copper
Electroanalysis ( IF 2.7 ) Pub Date : 2017-12-01 , DOI: 10.1002/elan.201700637
Xu Yiwei ₁ , Zhang Wen ₁ , Huang Xiaowei ₁ , Shi Jiyong ₁ , Zou Xiaobo ₁ , Li Yanxiao ₂ , Cui Xueping ₁ , Haroon Elrasheid Tahir ₁ , Li Zhihua ₁

Affiliation

Glassy carbon electrode (GCE) modified with L‐cysteine and gold nanoparticles‐reduced graphene oxide (AuNPs‐RGO) composite was fabricated as a novel electrochemical sensor for the determination of Cu²⁺. The AuNPs‐RGO composite was formed on GCE surface by electrodeposition. The L‐cysteine was decorated on AuNPs by self‐assembly. Physicochemical and electrochemical properties of L‐cysteine/AuNPs‐RGO/GCE were characterized by scanning electron microscopy, atomic force microscopy, energy dispersive spectroscopy, Raman spectroscopy, X‐ray diffraction, cyclic voltammetry and adsorptive stripping voltammetry. The results validated that the prepared electrode had many attractive features, such as large electroactive area, good electrical conductivity and high sensitivity. Experimental conditions, including electrodeposition cycle, self‐assembly time, electrolyte pH and preconcentration time were studied and optimized. Stripping signals obtained from L‐cysteine/AuNPs‐RGO/GCE exhibited good linear relationship with Cu²⁺ concentrations in the range from 2 to 60 μg L⁻¹, with a detection limit of 0.037 μg L⁻¹. Finally, the prepared electrode was applied for the determination of Cu²⁺ in soil samples, and the results were in agreement with those obtained by inductively coupled plasma mass spectrometry.

中文翻译：

自组装的L-半胱氨酸和电沉积的金纳米粒子还原的氧化石墨烯修饰的电极用于铜的吸附剥离测定

制备了用L-半胱氨酸和金纳米颗粒还原的氧化石墨烯（AuNPs-RGO）复合材料修饰的玻碳电极（GCE）作为测定Cu ²⁺的新型电化学传感器。AuNPs-RGO复合材料通过电沉积在GCE表面形成。L-半胱氨酸通过自组装在AuNP上修饰。L-半胱氨酸/ AuNPs-RGO / GCE的理化和电化学性质通过扫描电子显微镜，原子力显微镜，能量分散光谱，拉曼光谱，X射线衍射，循环伏安法和吸附溶出伏安法进行表征。结果证实了所制备的电极具有许多吸引人的特征，例如大的电活性面积，良好的导电性和高灵敏度。研究和优化了实验条件，包括电沉积循环，自组装时间，电解质pH和预浓缩时间。从L-半胱氨酸/ AuNPs-RGO / GCE获得的剥离信号与Cu ²⁺表现出良好的线性关系浓度范围为2至60μgL ^-1，检测极限为0.037μgL ^-1。最后，将制备好的电极用于土壤样品中Cu ²⁺的测定，结果与电感耦合等离子体质谱法测定的结果相符。

更新日期：2017-12-01

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