Surface modification-assisted solvent annealing to prepare high quality M-phase VO2 nanocrystals for flexible thermochromic films

摘要: Abstract Well-crystalline and stoichiometric M-phase vanadium dioxide (VO2 (M)) ultrafine nanoparticles are desired in fabricating high-efficient VO2-based flexible thermochromic films. In this study, a novel solvent annealing technique is developed to avoid growth agglomeration of VO2 (M) the post-annealing process. Oxygen-deficient (D) (~36 nm) firstly prepared by facial hydrothermal method. A double-layered reactor designed separate surfactant-modified physically from H2O2 which serves as oxidant. The unique enables formation moderate oxygenation environment process, making transformation oxygen-deficient more controllable. effectively suppressed due surface modification polyvinyl pyrrolidone, liquid low temperature. obtained have an average particle size ~41 nm. film with exhibit excellent properties ΔTsol reaching 18.03% Tlum up 58.33%. This amazing performance attributed high quality that makes plasmon absorption take effect solar light region. work demonstrates proposed effective approach prepare high-quality for achieving efficient smart windows.