Fe₃O₄@C/Au nanoparticle (AuNP) nanocomposites were prepared through electrostatic adsorption of AuNPs onto PDDA-functionalized core/shell Fe₃O₄@C magnetic nanospheres, which had been synthesized by a facile solvothermal method. The morphology and composition of the nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), etc. Moreover, highly electrocatalytic activity to the reduction of hydrogen peroxide (H₂O₂) was also exhibited on the Fe₃O₄@C/AuNP-modified indium tin oxide (ITO) electrode. The effect of solution pH and the modification amount of Fe₃O₄@C/AuNPs on the performance of electrocatalytic H₂O₂ reduction was investigated. Under the optimal conditions, the catalytic current showed a linear relationship with the increase of H₂O₂ concentration in the range of 0.007–15 mM and a detection limit of 5 μM. The H₂O₂ sensor showed high selectivity for H₂O₂ detection, which could effectively resist the interference of ascorbic acid (AA), uric acid (UA), and citric acid (CA). Finally, the H₂O₂ sensor was used in the real fetal bovine serum to detect H₂O₂ and obtained satisfactory results with the recovery values ranging from 95.14 to 103.6%.

中文翻译：

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基于磁性核-壳Fe3O4 @ C / Au纳米颗粒纳米复合材料的新型非酶过氧化氢传感器

通过将AuNPs静电吸附到PDDA功能化的核/壳Fe ₃ O ₄ @C磁性纳米球上，制备了Fe ₃ O ₄ @ C / Au纳米颗粒（AuNP）纳米复合材料，该纳米球已通过一种容易的溶剂热法合成。通过透射电子显微镜（TEM），扫描电子显微镜（SEM），傅立叶变换红外光谱（FT-IR）等表征了纳米复合材料的形貌和组成。此外，该复合物还具有很高的电催化活性，可还原过氧化氢（H ₂ O）。₂）也出现在Fe ₃ O _4上@ C / AuNP改性的铟锡氧化物（ITO）电极。研究了溶液的pH值和Fe ₃ O ₄ @ C / AuNPs的改性量对H ₂ O ₂电催化还原性能的影响。在此条件下，催化电流显示出与H的增加呈线性关系₂ ö ₂浓度在0.007-15毫范围内和5的检测极限 μ M.为H ₂ ö ₂传感器表现出对H高选择性₂ O ₂检测可有效抵抗抗坏血酸（AA），尿酸（UA）和柠檬酸（CA）的干扰。最后，H实际胎牛血清中使用₂ O ₂传感器检测H ₂ O ₂，回收率从95.14到103.6％，均获得满意的结果。