高定向ZnO纳米棒阵列膜的制备及其光学性能

采用阴极恒电位沉积方法,在Zn(NO3)2溶液中,用六亚甲基四胺作为形貌控制试剂,直接在氧化铟锡玻璃衬底上制备出透明致密的ZnO纳米棒阵列膜。通过X射线衍射、扫描电镜和能量色散谱表征了薄膜的形貌和结构,测量了ZnO纳米棒阵列膜的光学透射谱和光致发光谱。结果表明:所制备的具有c轴高度择优取向的ZnO纳米棒为高纯单晶纤锌矿结构,粒径约为200nm,膜的结晶度和表面平整度明显提高。ZnO薄膜在可见光区具有高透射率(80%)和陡峭的吸收边缘,室温光致发光谱显示,在380nm处存在一个尖锐的强紫外发射峰和在510nm处存在一宽带弱绿光发射峰。

FABRICATION AND OPTICAL PROPERTIES OF HIGHLY ORIENTED ZnO NANOROD ARRAY FILMS

Transparent and compact ZnO nanorod array films were fabricated on indium tin oxide glass substrate by a potentiostatic electrodeposition method in Zn（NO3）2 solution using adding hexamethylenetetramine as shape control agent. The morphology and structure of the ZnO films were characterized by X-ray diffraction,scanning electron microscopy and energy dispersive spectroscopy,transmittance and photoluminescence spectra of the ZnO films were measured. The results indicate that the as-synthesized ZnO nanorod films with high c-axis preferred orientation possess a high-quality single-crystal wurtzite structure,their average grain diameter is about 200 nm,and the crystalline degree and surface smoothness of the ZnO nanorod films obviously increase. The transmittance of the ZnO films is more than 80% in the visible region,and has a steep absorption edge. The photoluminescence spectra at room temperature show that a strong and sharp ultraviolet emission peak and a weak green emission peak of the ZnO films are located at 380 and 510 nm,respectively.