Ag纳米阵列嵌埋单斜相二氧化钒复合薄膜的制备及光/电性能

Optical/Electrical Properties of Monoclinic Vanadium Dioxide Composite Film Embedded with Ag Nanoparticle Arrays

基于六角密排聚苯乙烯(PS)模板,采用电子束蒸镀法在石英基片上制备了Ag纳米阵列嵌埋的单斜相二氧化钒复合薄膜(Ag NPAs/VO2(M)),研究复合薄膜的微观结构、相变特性及光透过率。结果表明:复合薄膜中同时存在VO2(M)和Ag两相。复合薄膜相变温度(TC)低至55℃,通过能带模型分析揭示了Ag纳米颗粒的嵌入使得复合薄膜中自由电子浓度升高,诱发相变在较低温度处发生。相对于纯的VO2薄膜,在590~750 nm波段的透射率明显减弱,归因于复合薄膜中Ag NPAs对590~750 nm波段的可见光共振吸收,使得VO2薄膜固有的棕黄色被削弱。

Based on the hexagonal-close-packed polystyrene(PS) template, a monoclinic vanadium dioxide composite film(Ag NPAs/VO2(M)) embedded with Ag nanoparticle arrays was prepared on a quartz substrate via electronic beam evaporation. The microstructure, phase transition characteristics and light transmittance of composite film were investigated. The results show that VO2(M) and Ag phases both coexist in the composite film. The phase transition temperature of the composite film is as low as 55 ℃. Based on the analysis by the band model, the embedding of Ag nanoparticles increases the free electron concentration in the composite film and induces the phase transition to occur at a lower temperature. Compared to pure VO2 film, the transmittance of the composite film in the 590–750 nm band is weakened, which is attributed to the visible absorption of visible light in the 590–750 nm band by Ag NPAs in the composite film, thus weakening the inherent brownish yellow of the VO2 film.