Modified color for VO2/Au/VO2 sandwich structure-based smart windows

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

“…Further optimization by using the VO 2 /HfO 2 /H 2 O multilayer structure boosts the solar energy modulation ability up to 20.8%, which is superior to any multilayer structure reported previously. By building a VO 2 /Au/VO 2 sandwiched structure, Zhou et al 197 demonstrated the modulation of VO 2 film color from brown−yellow to dark blue−green, by introducing localized surface plasmon resonance (LSPR), however, these dark colors and increased optical absorption remains unsatisfactory for practical view of applications. With the adequate flexibility of multilayer design and construction, Hong et al 198 reported the formation of a coupled Fabry−Peŕot (F−P) cavity by building lossy Ag NPs/VO 2 /Pt multilayered structures, forming a metal− dielectric−metal film, and vivid color changes can be controlled by varying the thickness of the transparent SiO 2 layer and temperature-regulated phase transition for VO 2 (Figure 9).…”

Influence of VO2 based structures and smart coatings on weather resistance for boosting the thermochromic properties of smart window applications

“…Sandwich-like structural adaptions have been tried by using different materials in the thin lm strategy. [126][127][128][129][130][131][132][133][134][135] For example, S. Long and coworkers designed SiN x /VO 2 (SV), VO 2 /SiN x (VS), and SiN x /VO 2 /SiN x (SVS) multilayers as shown in Fig. 8(a).…”

Large‐Area Plasmonic Switches Based on Crystalline Au Nanoparticles Between VO2 Layers for Enhanced Switching in Visible–Near‐Infrared Regime

“…A VO 2 /Au/VO 2 sandwich structure was proposed for smart windows such that the color of the windows could be attained by controlling the gold thickness. [21] More recently, several lithography-based techniques have been employed-such as electron beam lithography, [14,15] focused ion beam (FIB) milling, [22] and nanosphere lithography-for the fabrication of the composite materials consisting of plasmonic nanostructures and VO 2 . Modulation of optical transmission in the NIR spectral regime was reported with subwavelength nanohole arrays in a metal-VO 2 double-layer film.…”

“…Liang et al also used this process to fabricate a VO 2 /Au/VO 2 nanotriangle sandwich array, wherein the VO 2 layers were also patterned. [25] As some of these research works [21,24,25] employ rapid thermal annealing to oxidize V thin films into VO 2 thin films, the crystalline quality of these VO 2 films is not very good. [21] Iridium-VO 2 composites have also been fabricated, using self-assembly of polystyrene microspheres in conjunction with the pulsed laser deposition (PLD) process, for modulation of LSPR peaks in the NIR regime.…”

“…[25] As some of these research works [21,24,25] employ rapid thermal annealing to oxidize V thin films into VO 2 thin films, the crystalline quality of these VO 2 films is not very good. [21] Iridium-VO 2 composites have also been fabricated, using self-assembly of polystyrene microspheres in conjunction with the pulsed laser deposition (PLD) process, for modulation of LSPR peaks in the NIR regime. [26] Studies of VO 2 -based optical switching devices-based on either VO 2 nanostructures or composite materials comprising of VO 2 and plasmonic metals-have primarily emphasized the thermal switching properties around the transition temperature for tuning the performance in the NIR, for wavelengths above 1000 nm.…”