In this work, a facile preparation method of cuprous oxide/gold (Cu2O/Au) nanocomposite was successfully developed. The process consisted of one-pot co-reduction of HAuCl4 and CuSO4 using ascorbic acid (AA) as a reducing agent at room temperature under magnetic stirring. The structures and compositions of the as-prepared products were characterized by SEM, EDS, and XRD. Cyclic voltammetry and chronopotentiometry studies revealed that the as-prepared cubic Cu2O/Au nanocomposites showed enhanced performance towards the non-enzymatic catalytic reduction of hydrogen peroxide (H2O2) when compared to single-component Cu2O nanocubes. The linear range of H2O2 determination spanned over 4 orders of magnitude (1 μM∼16.7 mM) and the detection limit was low as 0.45 μM (S/N=3). The enhanced performance of cubic Cu2O/Au was attributed to: i) the synergistic effect between Cu2O and Au, ii) the increase in surface area induced by the reduced size of the nanocubes, and iii) the improved electrical conductivity due to the presence of Au in the particles. Overall, the cubic Cu2O/Au nanocomposites prepared by the proposed method hold great promise for future practical use in H2O2 detection.

中文翻译：

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用于过氧化氢非酶促电流检测的氧化亚铜/金纳米复合材料的简便合成

在这项工作中，成功开发了一种简便的氧化亚铜/金（Cu2O/Au）纳米复合材料的制备方法。该过程包括在室温下磁力搅拌下使用抗坏血酸 (AA) 作为还原剂对 HAuCl4 和 CuSO4 进行一锅共还原。通过SEM、EDS和XRD表征了所制备产物的结构和组成。循环伏安法和计时电位法研究表明，与单组分 Cu2O 纳米立方体相比，所制备的立方 Cu2O/Au 纳米复合材料对过氧化氢 (H2O2) 的非酶催化还原表现出增强的性能。H2O2 测定的线性范围跨越 4 个数量级 (1 μM∼16.7 mM)，检测限低至 0.45 μM (S/N=3)。立方 Cu2O/Au 的增强性能归因于：i) Cu2O 和 Au 之间的协同效应，ii) 由纳米立方体尺寸减小引起的表面积增加，以及 iii) 由于颗粒中 Au 的存在，提高了电导率。总体而言，通过所提出的方法制备的立方 Cu2O/Au 纳米复合材料在未来 H2O2 检测中的实际应用前景广阔。