Tunable Assembly of Vanadium Dioxide Nanoparticles to Create Porous Film for Energy-Saving Applications

摘要

Nanoparticle-assembled vanadium dioxide (VO2) films have been easily prepared with the assistance of cetyltrimethylammonium vanadate (CTAV) precursor which exhibits self-assembly properties. The obtained VO2 film has a microano hierarchical porous structure, so its visible-light transmittance is significantly improved (~25% increased compared to continuous film). The VO2 particle density as well as the film porosity can be facilely controlled by adjusting experimental parameters such as dip-coating speed. Accordingly, film optical properties can also be tuned to a large extent, in particular the visible transmittance (T_(vis)) and near-infrared switching efficiency (Δr_(nir)). These VO2 nanoparticle-assembled films prepared by this novel method provide a useful model to research the balance between T_(vis) and ΔX_(nir).