采用溶胶-凝胶技术制备了ZnO/BaTiO3纳米复合材料,用X射线衍射仪(XRD)、透射电子显微镜(TEM)测定了不同温度处理后样品的组成、结构、形貌和尺寸.对复合材料室温下的光致发光谱分析发现,复合材料的发光强度比纯的纳米ZnO发光显著增强;纳米ZnO中氧空位引起的510nm发光带的峰位随着热处理温度的不同而分别出现蓝移和红移现象.其中蓝移主要是量子尺寸效应引起的,而红移则可能与致密化的BaTiO3所提供的高介电场有关.
The ZnO/BaTiO3 nanocomposite system was prepared by a sol-gel method. The particle size, structure and phases of the nanocomposite were studied by XRD and
TEM. In addition, enhanced photoluminescence of the nanocomposite under 370nm light excitation was observed at room temperature. The blue-green emission peak
induced by oxygen vacancies of nano-ZnO particles, has blue-shift or red-shift with different heat-treatment temperatures, the blue-shift is assigned to quantum
size effect, and the red-shift is attributed to the high dielectric environment effects of the BaTiO3 matrix.
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