氨水体系中制备ZnO纳米棒及其生长机理

Preparation of ZnO nanorods in system of ammonia aqueous solution and its growth mechanism

对氨水溶液体系中种子层法制备ZnO纳米棒的生长机理进行研究。采用溶胶-凝胶法制备出具有002择优取向的ZnO种子层薄膜,利用XRD研究旋涂速度和热处理温度对薄膜取向性的影响;采用密闭高压的氨水溶液体系制备出具有高比表面的ZnO纳米棒,利用SEM对Zn O的微观形貌进行表征,并说明了氨水体系下ZnO纳米棒薄膜的生长机理。测试果表明,4000r/min及300℃的热处理温度制备的ZnO种子层薄膜具有显著的002择优取向,有利于后续ZnO纳米棒沿002方向择优生长。氨水体系下,所获得的ZnO纳米棒长径比大于50,且顶部呈六角锥形,棒与棒之间的空隙较大,有利于敏感气体和量子点的吸附。

The growth mechanism of ZnO nanorods prepared by seed layer method in ammonia aqueous solution system is studied. ZnO seed layer films with 002 preferred orientation are prepared by sol-gel method, and the effects of spin coating speed and heat treatment temperature on the orientation of the films are studied by XRD. ZnO nanorods with high specific surface area are prepared in a sealed high pressure ammonia aqueous solution system, the morphology of ZnO nanorods is characterized by SEM, and the growth mechanism of ZnO nanorod films in ammonia aqueous system was explained. Test results show that rhe ZnO seed layer films prepared at 4000 r/min and 300 ℃ have significant 002 preferred orientation, which is conducive to the subsequent preferential growth of ZnO nanorods along 002 direction. In ammonia-water system, the length-diameter ratio of the obtained ZnO nanorods is more than 50, and the top is a hexagonal cone. The gap of the rods is large, which is conducive to the adsorption of sensitive gases and quantum dots.