AbstractThis work reports on the synthesis of nanocomposites from NiO and α-Fe2O3 by a hydrothermal route. The material was characterized in terms of structural and morphological features by X-ray diffraction and scanning electron microscopy. The nanocomposites were synthesized by growing α-Fe2O3 nanoparticles on the surface of flower-like NiO nanosheets, and then characterized by cyclic voltammetry and amperometric techniques. A glassy carbon electrode (GCE) modified with the nanocomposite displayed distinctly improved response to H2O2 compared to a GCE modified with bare NiO. The H2O2 sensor, best operated at a voltage of 0.4 V (vs. Ag/AgCl) has a sensitivity of 146.98 μA·μM−1·cm−2, a 0.05 mM lower detection limit, and a linear working range that extends from 0.5 to 3 mM of H2O2. The sensor is reproducible and long-term stable even in the presence of various interfering molecules such as ascorbic acid and uric acid. Graphical abstractSchematic of a non-enzymatic electrochemical platform for H2O2 detection using NiO/α-Fe2O3 nanocomposites. The sensor has a 50 µM detection limit and good selectivity over potentially interfering agents.

中文翻译：

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基于使用沉积在 NiO 纳米片表面的 α-Fe2O3 纳米粒子的过氧化氢非酶传感器

摘要这项工作报告了通过水热法从 NiO 和 α-Fe2O3 合成纳米复合材料。该材料通过 X 射线衍射和扫描电子显微镜在结构和形态特征方面进行了表征。通过在花状 NiO 纳米片表面生长 α-Fe2O3 纳米粒子合成纳米复合材料，然后通过循环伏安法和电流分析技术对其进行表征。与用裸 NiO 改性的 GCE 相比，用纳米复合材料改性的玻碳电极 (GCE) 对 H2O2 的响应明显改善。H2O2 传感器的最佳工作电压为 0.4 V（相对于 Ag/AgCl），其灵敏度为 146.98 μA·μM-1·cm-2，检测下限为 0.05 mM，线性工作范围从 0.5至 3 mM H2O2。即使在抗坏血酸和尿酸等各种干扰分子存在的情况下，该传感器也具有可重复性和长期稳定性。图形摘要使用 NiO/α-Fe2O3 纳米复合材料进行 H2O2 检测的非酶电化学平台示意图。该传感器具有 50 µM 的检测限和对潜在干扰物质的良好选择性。