化学气相沉积法合成梳状纳米ZnO及其发光性能研究

Synthesis and luminescence properties of comb-like ZnO nanostructure via CVD method

在600-700℃，无催化剂条件下热蒸发Zn及Zn与醋酸锌（Zn（Ac）2）的混合物，成功合成了梳状纳米ZnO．通过场发射扫描电镜（FESEM）及高分辨透射电镜（HRTEM）对各类反应奈件下所制备的ZnO纳米形貌进行了观察，结果表明，ZnO纳米结构具有规整的梳状，且为单晶结构，同时对梳状纳米结构体系的生长机理进行了探讨．室温光致发光谱显示，梳状ZnO的紫外发射峰位为397nm，有明显的红移，同时半高宽（FWHM）变大，而绿光发射峰位在453～493nm之间分裂为4个次级峰，有明显的蓝移．

Without catalyst, novel comb-like ZnO nanostructure is synthesized at low temperature （600- 700℃） through thermal evaporation the mixture of zinc powder and zinc acetate Zn（Ac）2 powder. Fieldemission scanning electron microscopy （FESEM） and high-resolution transmission electron microscopy （HRTEM） images show that the as-synthesized ZnO have single crystal structure with comb-like morphology. Based on the HRTEM observation, the growth mechanism of the ZnO nanostructures is also discussed. Room temperature photoluminescence（PL） spectrum show that ZnO nanostructure has a broad UV emission peak at about 397nm, showing red shift obviously, and a green emission peak with 4 subordinate peaks from 453 to 493nm, the absorption peak showing blue shift obviously.