Transmission increase upon switching of VO2 thin films on microstructured surfaces

Abstract

Synthesis and structural, electrochromic characterization of pulsed laser deposited vanadium oxide thin films

Nanothermochromics: Calculations for VO2 nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation

“…Even better properties can be obtained with five-layer coatings of TiO 2 / VO 2 / TiO 2 / VO 2 / TiO 2 . 22,23 Deposition of VO 2 onto ordered arrays of silica microspheres offers other possibilities to increase the transmittance 24 ͑although, apparently, the effect was not reproduced in some other work 25 ͒. Nevertheless the problem with too low transmittance has remained.…”

Preparation of paraboloid-like VO2@SiO2 nanostructured arrays for enhanced transmission

“…Firstly, drops of colloidal solutions of SiO 2 nanospheres were dispersed by drainage pieces onto the surface of deionized water to form monolayers [10]. A dip coater was employed to steep and lift the lower half of the substrate vertically with a speed of 100 μm min À 1 .…”

“…In this letter, we reported, for the first time, a novel route to prepare paraboloidlike VO 2 @SiO 2 arrays via direct assembly [9] of SiO 2 nanospheres and rapid thermal annealing (RTA) of sputtered vanadium film. Compared with etching [8] or solvent evaporation [10], direct assembly could form high quality SiO 2 arrays in low cost and large scale, and SiO 2 nanospheres could be regarded as double-sided ARS surfaces with paraboloid-like arrays. With a short time of annealing, RTA could weaken the expansion of VO 2 films and keep uniform of VO 2 @SiO 2 arrays [11].…”

Infrared-wave number-dependent metal–insulator transition in vanadium dioxide nanoparticles

“…A similar increase in the transmittance observed in the metallic phase of VO 2 thin films on microstructured surfaces was attributed to change of the scattering efficiency upon phase transition. 24 Similarly, the sharp peak at higher wave numbers at the transition may be attributed to reduced light scattering between KBr and VO2NP due to a change in the refractive index of VO2NP in the transition region, having to do with the Christiansen effect.…”