A novel multifunctional smart window was developed using VO2 thermochromic films with TiO2 coatings for antireflection. A strong enhancement in luminous transmittance of VO2 was calculated using either a single layer or a double layer of TiO2 for antireflection, with the double layer giving the best performance. A TiO2 (25nm)/VO2 (50nm)/TiO2 (25nm) structure, of which the film thickness has been optimized to a maximum integrated luminous transmittance (Tlum ) by calculation, was deposited on glass by sputtering in turn a V target in Ar+O2 for VO2 and a TiO2 target in Ar for TiO2! Optical properties were measured with a spectrophotometer, and the integrated solar and luminous properties were calculated based on the measured spectra. A maximum increase in Tlum by 86% (from 30.9% to 57.6%)was obtained for VO2 after double layer TiO2 antireflection coating. The deposited VO2 film on SiO2 exhibits good thermochromism with a sharp optical transition at 58.5℃, which decreased slightly to 57.5 ℃ after TiO2 coating. The proposed window is the most advanced among the similarly reported in being multifunctional with automatic solar/heat control, ultraviolet stopping, and possibly a wide range of photocatalytic functions in addition to highly luminous transmitting.%利用VO2热变色薄膜和TiO2防反射涂层制备了一种新型的多功能智能窗口.通过计算设计了可见光透过率大大增强的VO2薄膜,其中分别使用了单层或双层的TiO2薄膜作为防反射层,结果表明具有双层TiO2薄膜的复合涂层具有更好的性能.通过厚度优化计算,TiO2(25nm)/VO2(50nm)/TiO2(25nm)复合结构的涂层具有最优的可见光透过率(Tlum).分别采用V靶在Ar和O2混合气氛、采用TiO2靶在Ar气氛依次在玻璃基板上沉积了TiO2/VO2/TiO2薄膜,并利用分光光度计测试了薄膜的光学性能.利用测试的光谱数据计算了其太阳光和可见光的积分透过特性,发现具有两层TiO2夹层的复合涂层可见光透过率最大可以增加86%(由30.9%到57.6%).在SiO2基板上沉积的VO2薄膜具有热变色效应,在58.5℃处表现出明显的光学性能转变,当在其表面施加TiO2后其相变温度变为57.5℃.所制备的智能窗口是所报道的光学窗口中最先进的,其不仅具有高的可见光透过率,而且具有自动调节太阳光和热、防紫外线及各种可能的光催化功能.
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