Abstract Herein, heterostructure CeO2-CuO nanocomposite was prepared via hydrothermal route. The structural, morphological and optical properties of the composite were examined using different characterization techniques such as XRD, SEM, HR-TEM, UV–Vis absorption, FT-IR, AFM and VSM. The electrocatalytic performance of CeO2-CuO modified electrode towards the determination of l -cysteine was investigated using cyclic voltammetry and amperometry techniques. The modified electrode shows wide linear range from 0.01 × 10−6 to 5 × 10−3 M with a very low detection limit of 0.01 × 10−6 M. The proposed electrochemical sensor displayed a sensitivity of 21.6 μA cm−2 mM−1 (R2 = 0.997). The CeO2-CuO modified electrode reveals high stability, good selectivity and appreciable reproducibility. The present work demonstrates a facile electrochemical method for the determination of l -cysteine.

中文翻译：

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基于 CeO2 的异质结构纳米复合材料用于 L-半胱氨酸生物分子的电化学测定

摘要 本文采用水热法制备了异质结构CeO2-CuO纳米复合材料。使用不同的表征技术，如 XRD、SEM、HR-TEM、UV-Vis 吸收、FT-IR、AFM 和 VSM，对复合材料的结构、形态和光学性质进行了检查。使用循环伏安法和电流法技术研究了 CeO2-CuO 修饰电极对 l-半胱氨酸测定的电催化性能。修改后的电极显示出从 0.01 × 10-6 到 5 × 10-3 M 的宽线性范围，检测限非常低，为 0.01 × 10-6 M。所提出的电化学传感器的灵敏度为 21.6 μA cm-2 mM-1 （R2 = 0.997）。CeO2-CuO 修饰电极显示出高稳定性、良好的选择性和可观的重现性。