Effect of Na doping on the microstructures and optical properties of ZnO nanorods
Effect of Na doping on the microstructures and optical properties of ZnO nanorods
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DOI：
10.1016/j.jallcom.2012.11.081
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发表时间：
2013-03
影响因子：
6.2
通讯作者：
Saliha Ilican
中科院分区：
文献类型：
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作者：
Saliha Ilican
采用溶胶-凝胶法和旋涂技术制备了未掺杂ZnO和Na掺杂ZnO（ZnO：Na）纳米棒薄膜。研究了Na掺杂对ZnO纳米棒薄膜的结构、形貌和光学性能的影响。通过扫描电子显微镜（SEM）测量证实了纳米棒的存在。X射线衍射（XRD）测试表明，未掺杂的ZnO纳米棒薄膜为六方纤锌矿晶相，并呈现沿着c轴择优取向。衍射图上仅出现一个对应于（002）相的峰。Na的掺入导致ZnO纳米棒薄膜的结构特性发生了实质性的变化。通过X射线光电子能谱（XPS）对Na掺杂ZnO纳米棒薄膜的化学组成进行了表征。用带积分球的双光束分光光度计研究了薄膜的光学性质。吸收边随Na含量的增加向低能方向移动。利用透射光谱和反射光谱测定了薄膜的光学常数，如折射率、消光系数、光学介电常数和光学电导率。薄膜的折射率色散曲线服从单振子模型。计算了由Wemple-DiDomenico提出的光学色散参数Eo和Ed。
Undoped ZnO and Na doped ZnO (ZnO:Na) nanorod films have been deposited by sol–gel method using spin coating technique. The effect of Na incorporation on structural, morphological and optical properties of ZnO nanorod films was investigated. The nanorods were confirmed by the scanning electron microscopy (SEM) measurements. X-ray diffraction (XRD) measurement showed that the undoped ZnO nanorod film was crystallized in the hexagonal wurtzite phase and presented a preferential orientation along the c-axis. Only one peak, corresponding to the (002) phase, appeared on the diffractograms. Na incorporation leads to substantial changes in the structural characteristics of ZnO nanorod films. The chemical composition of the Na doped nanorod ZnO films was confirmed by X-ray photoelectron spectroscopy (XPS). Optical properties of the films were investigated with a double beam spectrophotometer with an integrating sphere. The absorption edge shifted to the lower energy depending on the Na content. The optical constants of these films, such as refractive index, extinction coefficient, optical dielectric constants and optical conductivity were determined using transmittance and reflectance spectra. The refractive index dispersion curve of the films obeys the single oscillator model. Optical dispersion parameters Eoand Eddeveloped by Wemple–DiDomenico were calculated.