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采用热还原法和原子层沉积技术制备了ZnO-TiO_2核壳纳米线,研究沉积厚度、沉积温度及退火对于ZnO-TiO_2核壳纳米线晶化和结构的影响。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨率透射电镜(HRTEM)等手段对退火前后核壳纳米线进行表征。结果表明:沉积厚度和温度的增加有利于TiO_2壳层发生非晶向晶化的转变;500℃退火提高了TiO_2的结晶性,但可能会使细核壳纳米线(ZnO纳米线直径<80 nm)产生波浪形变形,使150℃沉积的非晶TiO_2壳层形成凸出晶粒,并导致其界面处ZnO缺失。
ZnO-TiO_2 core-shell nanowires were prepared by thermal reduction and atomic layer deposition. The effects of deposition thickness, deposition temperature and annealing on the crystallization and structure of ZnO-TiO_2 core-shell nanowires were investigated. The core-shell nanowires before and after annealing were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) The results show that the increase of deposition thickness and temperature is conducive to the transition from amorphous to amorphous. The annealing at 500 ℃ increases the crystallinity of TiO_2, but may lead to the formation of fine shell nanowires (ZnO nanowire diameter <80 nm ) Produced wave-shaped deformation, which made the amorphous TiO 2 shell deposited at 150 ℃ form protruding grains and led to the absence of ZnO at the interface.