pH值与温度对WO3纳米粉体制备的影响

摘要

以偏钨酸铵（AMT）、柠檬酸（CA）、乙二醇（EG）为原料，用溶胶-凝胶法制备了纳米WO3粉体。通过热重-差热分析（TG-DSC）、X射线衍射（XRD）、场发射扫描电子显微镜（SEM）、透射电子显微镜（TEM）、红外分析仪（FT-IR）、比表面积测试（BET）等分析测试手段对粉体的结构、颗粒形貌和粒径进行表征，重点研究了pH值以及焙烧温度对粒径及形貌的影响。结果表明：当pH=1时，所制备出的WO3粉体呈多面体或球状，颗粒间的团聚较弱，在600℃烧结制备出的WO3粉体颗粒大小均匀，其平均粒径为40 nm左右。%The tungsten trioxide was prepared by the sol-gel method with Ammonium metatungstate ,citric acid and glycol as raw materials. The phase composition, morphology and particle size of powders were analyzed by TG-DSC, XRD, FT-IR, SEM, TEM and BET. The effects of pH value and temperature on the particle size and morphology were mainly studied. The results show that the particle of WO 3 powder are polyhedron or spherical with weak aggolomerate between particles when the pH of sol solution is 1. After sintered at 600 ℃, the particle size of WO3 powder with average size of 40 nm is uniform.