Abstract This work aims to compare the effects on the morphology and optical properties of ZnO NRs (Eg: 3.33 eV) when coupled with metal oxides of various bandgaps, i.e. CuO (Eg: 1.72eV), NiO (Eg: 3.76 eV), and Al2O3 (Eg: 7.07 eV). The amount of metal oxide deposited on the hydrothermally grown ZnO NRs was controlled by the UV irradiation duration of the photo-oxidation process. The deposition of CuO on ZnO NRs produced flake-like structures while Al2O3 deposition created tubular structures. However, when coupled with NiO, ZnO NRs were uniformly covered by a thin layer of NiO without morphological change. The optical bandgap of ZnO NRs was modified slightly from 3.20 eV to 3.17, 3.28 or 3.16 eV after coupling with CuO, NiO, or Al2O3, respectively. The strongest enhancement of IUV/Ivis ratio in the RTPL spectra of ZnO NRs was achieved from Al2O3 coupling.

中文翻译：

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ZnO纳米棒与不同带隙金属氧化物光氧化偶联的形貌和光学性质

摘要 本工作旨在比较 ZnO NRs (Eg: 3.33 eV) 与各种带隙的金属氧化物，即 CuO (Eg: 1.72eV)、NiO (Eg: 3.76 eV) 和Al2O3（例如：7.07 eV）。沉积在水热生长的 ZnO NRs 上的金属氧化物的量由光氧化过程的紫外线照射持续时间控制。CuO 在 ZnO NRs 上的沉积产生了片状结构，而 Al2O3 沉积产生了管状结构。然而，当与 NiO 结合时，ZnO NRs 被一层薄薄的 NiO 均匀覆盖，没有形态变化。在分别与 CuO、NiO 或 Al2O3 耦合后，ZnO NRs 的光学带隙从 3.20 eV 略微改变到 3.17、3.28 或 3.16 eV。