水浴加热水解和微波加热水解法合成不同形貌的ZnO亚纳米粒子

SYNTHESIS OF ZnO SUB-NANOPARTICLES WITH DIFFERENT MORPHOLOGIES BY HYDROLYSIS IN WATER BATH/IN MICROWAVE FIELD

以pH值为11.17的0.005 mol/L的ZnAc2和氨水的混合溶液为前驱体溶液,分别在80℃水浴中加热1 h合成了棒状ZnO亚纳米粒子,和在微波场(频率为2.45 GHz,功率为500 W)中加热2 min合成了花状ZnO亚纳米粒子.用X射线衍射仪和透射电子显微镜研究了产物的结构和形貌.结果表明:产物均为六方晶系ZnO,形貌分别为直径约100～300nm,长度约450～900 nm的棒状,和花瓣直径约为200 nm的花状结构.比较了采用这2种方法所得产物的形貌,并讨论了其形成机理.

Using a mixture of 0. 005 mol/L ZnAc2 and ammonia with a pH of 11. 17 as precursor solution, the rod-like ZnO subnanoparticles were successfully prepared by the hydrolysis in a water bath, in which the precursor solution was heated at 80℃ for 1 h. The flower-like ZnO sub-nanoparticles were prepared by the hydrolysis of the precursor solution in a microwave field （2.45 GHz, 500 W） for 2 min. The structure and morphology of the as-prepared products were characterized by X-ray diffraction and transmission electron microscope. The results show that both of the two products are of hexagonal-phased ZnO. The particles sizes are 100-300 nm in diameter and 450-900 in length for rod-like particles and 200 nm in diameter for flower-like particles. The morphologies for products obtained by different methods are compared and the formation mechanism is discussed.