摘要
以溶胶-凝胶浸渍提拉法制备WO3光致变色薄膜。用色差计表征了材料的光致变色特性,并结合XRD、AFM、SEM、TEM、UV-Vis等手段,研究了热处理温度变化对其微观结构及光致变色性能的影响。结果表明,WO3薄膜光致变色性能随热处理温度升高而增强。当温度为350℃时,色差达到最大值2.2462,这是因为传导电子浓度随温度的升高而增大,有利于光生电子和空穴的产生,且此时禁带宽度最窄,电子易被激发到导带。当温度为400℃时,晶粒粗大,比表面积减小,光致变色性能降低。温度升至450℃时,晶格发生畸变,不利于电子空穴对分离,光致变色性能进一步降低。
WO3 thin films were prepared via sol-gel dip-coating method. The photochromic properties of the WO3 thin films were characterized by color difference meter; effects of heat treatment temperature on its microstructure and photochromic properties were investigated by XRD, AFM, SEM, TEM and UV-Vis. The results show that the photochromic properties of the WO3 thin films are enhanced with the rise of heat treatment temperature. When it is 350 ℃, the color difference reaches to the top of 2.2462, which is because the conduction electron concentration increasing with the rise of heat treatment temperature is propitious to produce photo-generated electron hole pairs. And it is easy to promote the electrons to conduction band at the narrowest band gap. When it is 400 ℃, the sample obtains depressed photochromic properties resulting from crassitude grains and decreasing specific surface area. When it is up to 450 ℃, the photochromic properties are further reduced, as lattice distortion goes against the separation of electron hole pairs.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第A01期504-507,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金青年基金(50702052)
湖北省教育厅科学技术研究项目(Q20091007)
关键词
光致变色
WO3薄膜
热处理温度
photochromic
WO3 films
heat treatment temperature
