Abstract In this paper, the influence of graphene oxide coating on optical and photoluminescence properties of zinc oxide nanorods (ZnO NRs) has been investigated. ZnO NRs were prepared using a hydrothermal route (from zinc nitrate hexahydrate and hexamethylenetetramine), graphene oxide (GO) was fabricated by Hummer’s method, while for synthesis of ZnO nanorods:graphene oxide nanocomposite (ZnO NRs:GO) on Si (100) substrate, a facile technique (drop coating) was proposed. The structural, morphological, optical and luminescence properties of the films were investigated using X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), together with Fourier transform infrared (FT-IR), Raman, ultraviolet–visible–near-infrared (UV/VIS/NIR) and photoluminescence (PL) spectroscopies. As revealed by XRD analysis, composites display a hexagonal wurtzite type structure with a (101) preferred grain orientation. The average crystallite sizes decrease from 45 to 40 nm after GO coating. The SEM study confirms successful coating of GO layers on flower-like ZnO nanostructures. The FTIR and Raman analyses validated the hybridization of nanocomposite and the strong interaction between ZnO NRs and GO. The band gap of the ZnO NRs:GO nanocomposite is lower (2.95eV) compared to that of ZnO NRs (3.11 eV), as determined from the analysis of UV absorbance spectra. The ZnO NRs:GO nanocomposite exhibits a broad PL band, from ∼450 nm to ∼750 nm, with a nearly white-light integrated emission and a chromaticity coordinate of (0.25, 0.34). Gaussian deconvoluted broad PL band exhibits three distinct sub-bands, associated with radiative recombinations in ZnO and GO.

中文翻译：

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氧化石墨烯包覆的花状 ZnO 纳米棒：光电特性

摘要 本文研究了氧化石墨烯涂层对氧化锌纳米棒（ZnO NRs）光学和光致发光性能的影响。ZnO NRs 使用水热法制备（来自六水合硝酸锌和六亚甲基四胺），氧化石墨烯（GO）通过 Hummer 方法制备，同时用于在 Si（100）衬底上合成 ZnO 纳米棒：氧化石墨烯纳米复合材料（ZnO NRs:GO） ，提出了一种简便的技术（滴涂）。使用 X 射线衍射 (XRD) 技术、扫描电子显微镜 (SEM) 以及傅里叶变换红外 (FT-IR)、拉曼、紫外-可见-近-红外 (UV/VIS/NIR) 和光致发光 (PL) 光谱。XRD分析表明，复合材料显示六方纤锌矿型结构，具有 (101) 优先晶粒取向。GO 涂层后，平均晶粒尺寸从 45 nm 减小到 40 nm。SEM 研究证实了在花状 ZnO 纳米结构上成功涂覆了 GO 层。FTIR 和拉曼分析验证了纳米复合材料的杂交以及 ZnO NRs 和 GO 之间的强相互作用。与 ZnO NRs (3.11 eV) 相比，ZnO NRs:GO 纳米复合材料的带隙较低 (2.95eV)，根据紫外吸收光谱分析确定。ZnO NRs:GO 纳米复合材料表现出宽的 PL 波段，从~450 nm 到~750 nm，具有近乎白光的集成发射和 (0.25, 0.34) 的色度坐标。高斯解卷积宽 PL 带表现出三个不同的子带，与 ZnO 和 GO 中的辐射复合相关。