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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。
A new multifunctional smart window was prepared by using VO2 thermochromic film and TiO2 anti-reflective coating. VO2 thin films with greatly enhanced visible light transmittance were designed and calculated, in which single or double TiO2 films were used as antireflection layers respectively. The results show that composite coatings with double TiO2 films have better performance. The coating with TiO2 (25nm) / VO2 (50nm) / TiO2 (25nm) composite structure has the best visible light transmittance (Tlum) through thickness optimization. The TiO2 / VO2 / TiO2 thin films were deposited on the glass substrates by using TiO2 target in argon atmosphere with Ar target and V target respectively. The optical properties of the films were measured by spectrophotometer. Using the measured spectral data to calculate the integral transmission characteristics of sunlight and visible light, it is found that the composite coating with two layers of TiO2 interlayer can increase the visible light transmittance up to 86% (from 30.9% to 57.6%). The VO2 thin film deposited on the SiO2 substrate has a thermochromic effect and shows a significant optical property transition at 58.5 ° C. The phase transition temperature becomes 57.5 ° C when TiO2 is applied on the surface of the SiO2 thin film. The prepared smart window is the most advanced of the reported optical windows, which not only has high visible light transmittance, but also has the ability to automatically regulate sunlight and heat, UV rays and a variety of possible photocatalytic functions.