纳米T-ZnO_W的制备及其生长机理研究  

Preparation and growth mechanism of nano-tetrapod zinc oxide whiskers

作　　者：周建萍[1] 丘克强[1] 傅万里[2] 杨素文[1] 

机构地区：[1]中南大学化学化工学院,长沙410083 [2]浙江大学材料与化学工程学院,杭州310027

出　　处：《功能材料与器件学报》2005年第4期406-410,共5页Journal of Functional Materials and Devices

摘　　要：以锌粒为原料,分子筛为催化剂,利用真空控氧高温气相氧化法,制备了纳米四针状氧化锌晶须(T-ZnOW)。利用XRD和SEM、TEM对产物进行物相分析和形貌观察。结果表明:产物为纯六方晶系纤锌矿结构氧化锌;体系压力和反应温度是影响晶须形貌的两个重要因素。当温度恒定为1038℃,而压力低于11083Pa时,均可获得根部直径为20~80nm、针长500nm^2μm、形貌规整的纳米T-ZnOW。TEM研究表明,纳米T-ZnOW的针部为单晶,而核心为多重孪晶结构,其生长遵循气固生长机理。Nano - tetrapod zinc oxide whiskers were prepared by vapor - phase oxidation under high temperature, with molecular sieve as the catalyst. X -ray diffraction analysis （XRD） shows that all the products are pure ZnO with wurtzite structure. Reaction temperature and system pressure are proved to have great effects on the morphology of T - ZnOw. When prepared under constant pressure, the morphology of the whiskers changes with the increasing of reaction temperature. Nano T - ZnOw with perfect structure can be obtained when the system pressure and reaction temperature are 11083Pa and 1038℃ respectively. While under constant temperature, the dimension of the products reduces with the reducing of the pressure. Uniform nano T -ZnOw with mot dimension of 20nm to 80nm and length of 500nm to 2μm can be obtained when the pressure is lower than 11083Pa. TEM results show that the arm of the nano T - ZnOw is single crystal and the nucleus is twin - crystal. The growth process of the whisker is accorded with the vapor- solid mechanism.

关 键 词：纳米四针状氧化锌晶须 高温气相法 微观形态 生长机理 

分 类 号：TB383[一般工业技术—材料科学与工程]