DataSheet1_Novel Synthesis of Sensitive Cu-ZnO Nanorod–Based Sensor for Hydrogen Peroxide Sensing.docx

We aimed to synthesize sensitive electrochemical sensors for hydrogen peroxide sensing by using zinc oxide nanorods grown on a fluorine-doped tin oxide electrode by using the facial hydrothermal method. It was essential to keep the surface morphology of the material (nanorods structure); due to its large surface area, the concerned material has enhanced detection ability toward the analyte. The work presents a non-enzymatic H2O2 sensor using vertically grown zinc oxide nanorods on the electrode (FTO) surfaces with Cu nanoparticles deposited on zinc oxide nanorods to enhance the activity. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-Ray (EDX), X-ray diffraction (XRD), and electrochemical methods were used to characterize copper–zinc oxide nanorods. In addition to the high surface area, the hexagonal Cu-ZnO nanorods exhibited enhanced electrochemical features of H2O2 oxidation. Nanorods made from Cu-ZnO exhibit highly efficient sensitivity of 3415 μAmM−1cm−2 low detection limits (LODs) of 0.16 μM and extremely wide linear ranges (0.001–11 mM). In addition, copper-zinc oxide nanorods demonstrated decent reproducibility, repeatability, stability, and selectivity after being used for H2O2 sensing in water samples with an RSD value of 3.83%. Cu nanoparticles decorated on ZnO nanorods demonstrate excellent potential for the detection of hydrogen peroxide, providing a new way to prepare hydrogen peroxide detecting devices.

本研究旨在通过简易水热法，在氟掺杂氧化锡（fluorine-doped tin oxide, FTO）电极上生长氧化锌纳米棒，以此制备用于过氧化氢检测的高灵敏度电化学传感器。维持该材料的表面形貌（纳米棒结构）至关重要，因其拥有较大的比表面积，可提升对目标分析物的检测性能。本研究构建了一种非酶法过氧化氢传感器，其在氟掺杂氧化锡电极表面生长垂直取向的氧化锌纳米棒，并在氧化锌纳米棒上沉积铜纳米颗粒以提升传感活性。本研究采用扫描电子显微镜（Scanning Electron Microscopy, SEM）、X射线光电子能谱（X-ray Photoelectron Spectroscopy, XPS）、能量色散X射线光谱（Energy-dispersive X-ray Spectroscopy, EDX）、X射线衍射（X-ray Diffraction, XRD）以及电化学方法对铜-氧化锌纳米棒进行表征。除比表面积较高外，六边形结构的铜-氧化锌纳米棒还展现出更优异的过氧化氢氧化电化学特性。铜-氧化锌纳米棒展现出3415 μA·mM⁻¹·cm⁻²的超高灵敏度、0.16 μM的低检出限（LOD）以及0.001~11 mM的极宽线性检测范围。此外，在水样过氧化氢检测实验中，铜-氧化锌纳米棒表现出良好的重现性、重复性、稳定性与选择性，相对标准偏差（Relative Standard Deviation, RSD）仅为3.83%。负载于氧化锌纳米棒上的铜纳米颗粒展现出优异的过氧化氢检测应用潜力，为过氧化氢检测器件的制备提供了全新思路。