PAM辅助水热法制备形貌可控的ZnO纳米结构(英文)  

ZnO Nanostructures with Controllable Morphology via a PAM-Assisted Hydrothermal Process

作　　者：葛洪良[1] 钟敏[1] 王瀚[1] 张磊[1] 何为桥 王宝玲[1] 

机构地区：[1]中国计量学院,浙江杭州310018

出　　处：《稀有金属材料与工程》2010年第S2期107-110,共4页Rare Metal Materials and Engineering

基　　金：Educational Office Scientific Item of Zhejiang Province (20070661);Opening Laboratory Item of China Jiliang University;NNSFC (20571067)

摘　　要：采用PAM辅助水热法制备了形貌可控的ZnO纳米晶。X射线衍射分析表明,分别以水和丙三醇为溶剂制备的短棒和棒状的ZnO纳米晶是纤锌矿结构。场发射扫描电镜结果显示,短棒状ZnO的直径约200nm,长约1.5μm,而棒状ZnO的直径约100nm,长度约3μm。当ZnO形貌从短棒向棒状转变时,晶体纵横比从7.5转变成30。荧光光谱分析表明,位于400-450nm的紫峰强度随着形貌从短棒向棒状转变时增大,表明更细更长的ZnO一维纳米结构的缺陷越多;位于520-550nm的绿峰强度随着形貌从短棒向棒状转变时增大,表明更细更长的ZnO一维纳米结构的氧空位越多。并对不同溶剂对ZnO纳米晶形貌的影响机制及ZnO纳米晶在水热条件下的生长机理进行了探讨。Different shapes of ZnO nanocrystals with controllable morphology were achieved by a PAM-assisted hydrothermal process. X-ray diffraction (XRD) analysis reveals that the cosh-like and rod-like ZnO nanocrystals prepared using H2O and glyceryl alcohol as the solvent respectively are of wurtzite structure. Field emission scanning electron microscopy (FESEM) analysis indicates that the nanocoshs have the diameter of 200 nm and the length up to 1.5 μm, while the nanorods possess the diameter of 100 nm and the length up to 3 μm. The aspect ratio increases from 7.5 to 30 when the morphology of ZnO changes from cosh-like to rod-like. Photoluminescence spectra analysis shows that the intensity of violet emission ranging from 400-450 nm and green emission ranging from 520-550 nm increased when the morphology of ZnO nanostructures changed from cosh-like to rod-like, indicating thinner 1D ZnO nanostructure with more defects and oxygen vacancies. The effect mechanism of solvents on the ZnO nanostructure morphology and the formation mechanism of the hydrothermally synthesized ZnO nanocrystals in different morphologies were discussed.

关 键 词：ZNO纳米结构 水热法 发光 

分 类 号：TB383.1[一般工业技术—材料科学与工程]