Synthesis of Monoclinic Vanadium Dioxide via One-Pot Hydrothermal Route

Abstract

Pure monoclinic vanadium dioxide nanoparticles (VO2 NPs) with a controlled uniform size are considered essential for the preparation of thermochromic smart window coatings on desired substrates. Herein, we report a facile one-step hydrothermal synthesis of VO2(M) NPs without post-treatment of annealing, which may induce unwanted aggregation of NPs. In contrast with the annealed sample, the one-step processed VO2(M) NPs exhibit superior thermochromic performance with the solar modulation efficiency of 11.8% and luminous transmittance of 37.3%.

Multistep synthesis of VO2 (M) nanoparticles and their application to thermochromic hybrid films for IR modulation

“…For the visible light region, the integrated luminous transmittance ( T lum ) is slightly increased with the temperature: 40.5% and 42.7% at 20.1 and 85.5°C, respectively, and therefore Δ T lum = T lum (LT) − T lum (HT) = −2.2%. This is due to the difference in the light scattering ability between the VO 2 (M) and the VO 2 (R) phase 69 …”

“…This is due to the difference in the light scattering ability between the VO 2 (M) and the VO 2 (R) phase. 69 The effect of the VO 2 (M)/PVP ratio on the thermochromic characteristics can be seen in Figure 5B for the composite films prepared by using the coating solutions with the three different VO 2 (M) contents (2.7, 4.4, or 6.0 wt%). The optical transmittance is apparently decreased with the increasing VO 2 (M) content at both the temperatures in the entire wavelength range due to the enhanced absorption and scattering by the NPs.…”