Abstract
Many progresses have been made for commercial application of adaptive VO2-based thermochromic smart window in the improvement of luminous transmittance (Tlum), phase transition temperature, solar regulation efficiency (ΔTsol), color modification, etc. The main obstacle for reaching this goal is relatively poor environmental durability of VO2. To address this issue, VO2 nanoparticle with hybrid shell (VO2@m-SiOx) was prepared by hydrolysis and polycondensation of the mixture of tetraethyl orthosilicate (TEOS) and Methyltriethoxysilane (MTES) using ammonia as catalyst in this paper. The optimized VO2@m-SiOx nanoparticle-based thermochromic films exhibited an ultra-high durability. The ΔTsol of thermochromic film in this study kept 44 % (from 19.0 % to 8.39 %) after 30 days in hyperthermal and humid environments, while the corresponding performance of film using uncoated VO2 nanoparticle disappeared completely after 2 days. This work provided a direct and effective way for improvement of stability of VO2 nanoparticle.
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