高品质四针状氧化锌晶须的结构及生长机理

Structure and Growth Mechanism of High-quality Tetrapod-like ZnO Whiskers

用锌粉氧化的方法，通过控制反应器内的气相过饱和度，合成出纯度高、晶体结构完 整、尺度可控的四针状氧化锌晶须（Ｔ－ＺｎＯ晶须）．制备的Ｔ－ＺｎＯ晶须为长尾晶须，针长为５～３０ μｍ，针体的根部尺寸为１～２μｍ，尾部约１００ｎｍ．晶须的生长机理为气－固（ＶＳ）机理．控制反应器 内的反应气相过饱和度是制备高品质Ｔ－ＺｎＯ晶须的关键因素．

The tetrapod-like ZnO whiskers were synthesized by oxidation of the Zn powders. High purity and perfect crystalline T-ZnO whiskers with different sizes were obtained by controlling gas supersaturation in the reaction container. The length of legs of the whiskers is approximately 5-30 jim and the geometrical edge size of centering nucleus is approximately 1-2 μm. Especially, the whiskers had long tail about 100nm. The whiskers grew via Vapor-Solid mechanism. Gas supersaturation in the reaction container is the key to pre- pare high-quality T-ZnO whiskers.