ZnO thin films are deposited on glass substrate using sol–gel spin coating methods with various annealing temperatures. The structural, morphological, and optical properties are studied by XRD, FE-SEM, UV–Vis, and photoluminescence spectrophotometer. The photocatalytic activity was assessed by examining the decomposition of Rhodamine-B (Rh-B) dye under UV illumination. The result shows that the ZnO films have a hexagonal wurtzite structure with highly preferred c-axis orientation. The (101) crystallographic plane appears at higher annealing temperatures. The transmittance of ZnO films is more than 80%, with a slight red shift in absorption and decrease in the optical band gaps as the annealing temperature increases to some extent. The photoluminescence spectra of the ZnO films at room temperature demonstrated the ultra-violet (UV) emission with a peak emission at 410 nm (3.03 eV). According to the photocatalytic activity examination, the presence of (101) plane in the c-axis oriented ZnO films enhances the photocatalytic performance by a factor of 5. The result revealed that ZnO films with multi-orientation structure possess better photocatalytic performance than that of the single-orientation ones. In particular, the photocatalytic performance is highly contributed by the polar crystal plane and slightly improved by the crystallinity and surface morphology.

ZnO薄膜使用溶胶-凝胶旋涂法在各种退火温度下沉积在玻璃基板上。通过XRD，FE-SEM，UV-Vis和光致发光分光光度计研究了结构，形态和光学性质。通过检查罗丹明B（Rh-B）染料在紫外线照射下的分解来评估光催化活性。结果表明，ZnO薄膜具有六方纤锌矿结构，具有高度优选的c轴方向。（101）晶面出现在较高的退火温度下。ZnO薄膜的透射率大于80％，随着退火温度的提高，吸收率略有红移，光学带隙减小。ZnO薄膜在室温下的光致发光光谱显示紫外线（UV）发射，并且在410 nm（3.03 eV）处具有峰值发射。据的光催化活性的检查，（101）面中的存在Ç轴取向的ZnO薄膜将光催化性能提高了5倍。结果表明，多取向结构的ZnO薄膜具有比单取向的ZnO薄膜更好的光催化性能。尤其是，光催化性能在极性晶面中有很大贡献，而在结晶度和表面形态方面则稍有改善。