四脚针状ZnO纳米结构的制备及表征

Fabrication and characterization of tetrapod-like ZnO nanostructures

采用以Zn粉、C粉为原料,采用热蒸发法,在没有任何载气和700℃下制备了四脚针状ZnO纳米结构。C粉起到了催化剂的作用但产物却不存在催化剂去除的问题,同时C粉氧化生成的CO/CO2还起到了载气的作用。扫描电镜(SEM)表明,四脚针状ZnO具有很细的尖端,直径为50 nm。X射线衍射(XRD)、微区拉曼图谱的特征峰表明,四脚针状ZnO是高纯的六角纤锌矿结构。光致发光(PL)谱在403 nm附近有微弱的紫光发射峰,而在510 nm附近出现了很强的绿光发射峰。

Tetrapod-like ZnO nanostructures were synthesized by thermal evaporation at 700 ℃ under air ambient using zinc and carbon power.Carbon powder can be used as catalyst but it needn′t to be removed from products,and CO/CO2 plays a role of transport gas.Scan electron microscopy（SEM） results indicate that ZnO tetrapod has a sharp tip on each tetrapod with the diameter of 50 nm.X-ray diffraction（XRD） and micro-Raman spectra reveal that ZnO tetrapod has a high pure hexagonal wurtzite structure.Photoluminescence spectra demonstrate that there is a weaker purple emission peak at about 403 nm,and a strong sharp green emission peak at 510 nm.