摘要
采用柠檬酸作添加剂,用水热法合成了单斜相(γ-WO_3)和正交相三氧化钨(β-WO_3)矩形片。通过研究产物的组成、形貌和比表面积随反应时间的变化,发现在反应过程中产物组成由γ-WO_3变为β-WO_3,形貌均保持为矩形片,比表面积基本不变。由此推断,反应中生成的中间产物经历一系列原位变化最终转变为β-WO_3。
Monoclinic tungsten trioxide（γ-W03 ） and orthorhombic tungsten trioxide（β-WO3） are hydrothermally synthesized with citric acid as additive. Through investigating the variation of product composition, morphology, and specific surface area with reaction time, it is found that the product composition changes from γ-W03 to β-WO3 and the morphology maintains in rectangular flakes and the specific surface area is unaltered approximately. According to the results,it is concluded that the final productβ-WO3 is formed via a series of in-situ changes of reaction intermediates.
关键词
单斜相三氧化钨
正交相三氧化钨
矩形片
柠檬酸
水热合成
monoclinic tungsten trioxide, orthorhombic tungsten trioxide, rectangular flakes,citric acid, hy- drothermal synthesis
