WO3/TiO2纳米晶的火焰合成及其电致变色性能研究
Flame synthesis and electrochromic properties of WO3/TiO2 nanocrystals
顾莉 1何小乐 1孟钰枫 1胡彦杰1
作者信息
- 1. 华东理工大学超细材料教育部重点实验室,上海市环境友好材料专业技术服务平台,材料科学与工程学院,上海 200237
- 折叠
摘要
通过自行设计的火焰喷雾燃烧系统合成纯WO3和Ti掺杂的WO3/TiO2纳米晶,采用旋涂法进行薄膜制备,并通过多种表征手段研究Ti掺杂量和退火温度对薄膜电致变色的影响.研究表明,Ti掺杂为薄膜提供更多的活性位点,增大离子迁移速率和电导率,WTi-6薄膜在633 nm处的最大光学调制为67.11％,着色效率也为纯WO3薄膜的1.7倍.同时,400 ℃的退火处理增强了 WTi-6薄膜和导电基材的附着力,薄膜的电化学性能得到提升,Li+在薄膜上嵌入/脱出的可逆性增强.相应地,退火后 WTi-6薄膜获得较高光学调制范围(76.05％),响应速度加快,在着色时间和褪色时间也分别由未退火的5.7、10.4 s缩短为5.5和8.2 s,着色效率提高至82.20 cm2/C.因此,通过火焰喷雾燃烧进行Ti掺杂改性和退火工艺精进,提高了 WO3薄膜电致变色性能,拓展了 WO3纳米晶的制备工艺,具有良好的应用前景.
Abstract
Pure WO3 and Ti doped WO3/TiO2 nanocrystals were synthesized by a self-designed flame spray com-bustion system,and the thin films were prepared by spin-coating method.The impact of Ti doping amount and annealing temperature on the electrochromic properties of the films were investigated by various characterization methods.The results show that Ti doping provides more active sites and increases the ion migration rate and conductivity.The maximum optical modulation of WTi-6 film at 633 nm is 67.11％,and the coloring efficiency is 1.7 times that of pure WO3 film.Meanwhile,the annealing treatment at 400 ℃ enhances the adhesion be-tween the WTi-6 films and the conductive substrate,and the electrochemical properties of the films and the re-versibility of Li+insertion/extraction on the films are improved.Correspondingly,the annealed WTi-6 films ob-tained a higher optical modulation range(76.05％),a faster response,and a shorter coloring time from the un-annealed 5.7 s and 10.4 s to 5.5 s and 8.2 s,and the coloring efficiency is increased to 82.20 cm2/C.Therefore,Ti doping modification and annealing process refinement through flame spray combustion improves the electro-chromic performance of WO3 thin films and expands the preparation process of WO3 nanocrystals,which has good application prospects.Therefore,Ti doping modification and annealing process refinement through flame spray combustion improves the electrochromic performance of WO3 thin films and expands the preparation process of WO3 nanocrystals,which has good application prospects.
关键词
WO3/TiO2/电致变色/Ti掺杂/退火Key words
WO3/TiO2/electrochromic/Ti doping/annealing引用本文复制引用
基金项目
国家自然科学基金面上项目(22378128)
国家自然科学基金面上项目(22108079)
出版年
2024
NETL
NSTL
万方数据