【作者】 于伟东； 李效民； 高相东； 边继明； 陈同来；

【Author】 Yu Wedong, Li Xiaomin, Gao Xiangdong, Bian Jiming, Chen Tonglai (State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics of Chinese Academy of Sciences, Shanghai 200050)

【机构】 高性能陶瓷和超微结构国家重点实验室中国科学院上海硅酸盐研究所；

【摘要】 采用气相传输法,以金膜为催化剂,氧化锌和石墨混合粉末为锌源,制备氧化锌纳米材料。研究不同衬底温度下,氧化锌纳米材料的形态,结构和形成过程。研究获得氧化锌纳米线的光致发光性能。初步探索了氧化锌纳米线的生长机理。实验结果表明,当衬底温度为600℃时,金颗粒的催化性能得到了较好的发挥,形成长度大于10微米,直径小于80纳米的均匀致密的氧化锌纳米线膜。这种氧化锌纳米线具有紫外发光特性。低于600℃时,锌氧蒸汽发生了自凝结,进而在金颗粒间隙形成氧化锌带(400℃时)或在金颗粒上吸附聚集形成花状氧化锌纳米棒(200℃)。而在高于600℃时,金颗粒析出的锌迅速挥发或氧化、长大,出现了稀疏的针状氧化锌和颗粒。氧化锌纳米线可能的生长模式为“底端生长”模式。更多还原

【Abstract】 ZnO nanomaterial was synthesized by the vapor transport method with the Zn source by the pyrolysis of ZnO with graphite powder and the catalyst of Au film. The morphology, structure and the PL property of the ZnO materials obtained under different temperatures were investigated. The results show that the dense and uniform ZnO nanowires with the length of around10μm and the diameter of about 80nm were acquired under the substrate temperature of 600℃. The UV-light with the wavelength of 380nm was detected from this kind of nanowires. When the temperature decreases to 400℃ and 200℃, the ZnO nanobelts and nanoflowers were formed respectively due to the self-solidification of the Zn or ZnO vapor. However, when the temperature was above 600℃, the sparse needle-like ZnO particles appeared due to the rapid volatilization or oxidation of the Zn vapor at the high temperature. The possible growth mechanism of ZnO nanowires was the “bottom-growth” mode.更多还原