A facile one-step annealing route to prepare thermochromic W doped VO2(M) particles for smart windows. Issue 11 (1st August 2020)

• Record Type: Journal Article
• Authors: Li, Bin; Yao, Jiajun; Tian, Shouqin; Fang, Zhaoda; Wu, Senwei; Liu, Baoshun; Gong, Xiao; Tao, Haizheng; Zhao, Xiujian
• Is Part Of: Ceramics international. Volume 46:Issue 11(2020)Part A
• Page Start: 18274
• Page End: 18280
• Publication Date: 2020-08-01
• Subjects: W doped VO2 -- One-step annealing -- Solid state reaction -- Phase transition temperature -- Thermochromic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.05.042
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: W doped VO2 is a promising thermochromic material for smart windows but its preparation process is usually complicated and time-consuming. In this work, W doped VO2 (V1-x Wx O2 ) particles were synthesized via a novel and facile one-step annealing method where V2 O5 and (NH4 )10 H2 (W2 O7 )6 composite powders were used as precursor. The solid state reaction between the products (VO2 and WO3 ) was considered to promote the diffusion of W elements into VO2 lattice during the annealing process which was confirmed by the XPS and EDS results. As increasing the content of (NH4 )10 H2 (W2 O7 )6, the phase transition temperature of V1-x Wx O2 was significantly reduced from 62.7 °C to 46.7 °C, meanwhile the corresponding V1-x Wx O2 /WO3 composite based films showed a same trend in the solar modulation efficiency from 10.7% to 7.8%. In addition, these films exhibited satisfactory visible transmittance of 56%–62%. Especially, the film based on the sample with V/W molar ratio of 8:1 showed a good thermochromic performance ( T MIT = 55.6 °C, Δ T sol = 9.7% and T lum = 60.8%) for smart windows. Therefore, this method based on the traditional solid-based reaction could provide a new way for elements doping into VO2 to promote application of VO2 in smart windows due to its low cost, repeatability and scale production.