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Study on thermochromic properties of VO2/ZnO nanocrystalline composite films

Li Yi Zhu Hui-Qun Zhou Sheng Huang Yi-Ze Tong Guo-Xiang Sun Ruo-Xi Zhang Yu-Ming Zheng Qiu-Xin Li Liu Shen Yu-Jian Fang Bao-Ying

Study on thermochromic properties of VO2/ZnO nanocrystalline composite films

Li Yi, Zhu Hui-Qun, Zhou Sheng, Huang Yi-Ze, Tong Guo-Xiang, Sun Ruo-Xi, Zhang Yu-Ming, Zheng Qiu-Xin, Li Liu, Shen Yu-Jian, Fang Bao-Ying
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  • Received Date:  09 May 2011
  • Accepted Date:  16 June 2011
  • Published Online:  15 September 2011

Study on thermochromic properties of VO2/ZnO nanocrystalline composite films

  • 1. (1)College of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; (2)College of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;School of Applied Physics and Materials, Wuyi University, Jiangmen Guangdong 529020, China; (3)College of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;Shanghai Key Laboratory of Modern Optical System, Shanghai 200093, China

Abstract: Based on thermo-optical phase transition effect, VO2/ZnO nanostructure composite films are designed and successfully prepared by depositing ZnO films with high (002) orientation on soda-lime glass substrates first, and then the vanadium dioxide films are fabricated by depositing vanadium metal films on ZnO films at room temperature and thermal oxidation treatment. The thermochromic properties of VO2/ZnO nanocomposite films are measured and compared with the single-layer VO2 films on SiO2 glass substrates with the same thickness. The lattice distortion and bonding state of the VO2/ZnO nanocomposite films before and after phase transition are observed and analyzed by Raman spectroscopy at the different temperatures. The relations of infrared switching properties and phase transition temperature to nanostructure and film thickness are discussed. The results show that the thermochromic optical properties are improved significantly. VO2/ZnO nano-composite films have high (002) orientation so that the infrared transmittance before phase transition is more than twice as large as that after phase transition, and the width of thermal hysteresis is narrowed by about 5℃ and phase transition temperature is decreased about 8℃. It suggestes that the nano-composite films can significantly reduce the phase transition temperature and enhance the infrared light switch modulation capabilities of VO2 thin films.

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