A cost-effective process to prepare VO{sub 2} (M) powder and films with superior thermochromic properties

• Published in: Materials research bulletin Vol. 51
• Main Authors: Xiao, Xiudi, Zhang, Hua, Chai, Guanqi, Sun, Yaoming, Yang, Tao, Cheng, Haoliang, Chen, Lihua, Miao, Lei, Xu, Gang
• Format: Journal Article
• Language: English
• Published: United States 01.03.2014
• Subjects: CALORIMETRY; DEPOSITS; DOPED MATERIALS; EFFICIENCY; MATERIALS SCIENCE; MODULATION; OPTICAL PROPERTIES; PARTICLES; PHASE TRANSFORMATIONS; POWDERS; THIN FILMS; TRANSITION TEMPERATURE; TRANSMISSION; TUNGSTEN; VANADIUM OXIDES
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/J.MATERRESBULL.2013.11.051

Graphical abstract: Combining codeposition and short time post annealing, VO{sub 2} (M) with high quality and excellent phase transition performance is obtained. After mixing the VO{sub 2} powder with acrylic resin, the composite films deposited on glass show superior visible transmission and solar modulation, which can be used as an excellent candidate of low cost smart window in energy saving field. - Highlights: • The VO{sub 2} powder obtained by short time thermolysis method is high purity and crystallinity with superior phase transition performance. • The maximum decreasing efficiency of phase transition temperature is about −30 K/at% with w = 0.4 at%. • After mixing VO{sub 2} powder with acrylic resin, the maximal visible transmission of the composite films is 48% and the transmission modulation at 2000 nm is 37.3% with phase transition temperature of 66.2 °C. • Though the phase transition performance is weakened by tungsten doping, the film prepared by 1.3 at% tungsten doped VO{sub 2} still show superior transmission modulation about 26.4%, which means that it is a potential candidate as smart windows. - Abstract: VO{sub 2} powder with superior phase transition performance was prepared by convenient thermolysis method. The results illustrated that VO{sub 2} powder show high purity and crystallinity. VO{sub 2} particles are transformed from cluster to quasi-sphere with the increase of annealing temperature. The DSC analysis proves that VO{sub 2} show superior phase transition performance around 68 °C. The phase transition temperature can be reduced to 33.5 °C by 1.8 at% tungsten doping. The maximum decreasing efficiency of phase transition temperature is about −30 K/at% with w = 0.4 at%. After mixing VO{sub 2} powder with acrylic resin, the maximal visible transmission of the composite thin films on glass is 48% and the transmission modulation at 2000 nm is 37.3% with phase transition temperature of 66.2 °C. Though the phase transition performance is weakened by tungsten doping, the film prepared by 1.3 at% tungsten doped VO{sub 2} still show superior transmission modulation about 26.4% at 2000 nm, which means that it is a potential candidate as smart windows.