Crystallized TiO₂ (A)–VO₂ (M/R) nanocomposite films with electrochromism–thermochromism dual-response properties

Abstract

This work offers a method to combine the advantages of thermochromic (TC) and electrochromic (EC) smart windows by synthesizing TC–EC dual-response TiO2–VO2 nanocomposite films.

Hydrothermal Synthesis of VO2 Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

“…Gao et al reported for the first time of a novel VO 2 ‐based smart window that combines energy‐saving and electricity generation in one device, that make it possible to regulate and utilize the solar radiation more efficiently . They also fabricated TiO 2 /VO 2 nanocomposite films with electrochromism and thermochromism dual‐function performance, and the optimum sample showed a good thermochromic performance with Δ T sol of 17.1% and T lum of 44.7% . A novel multifunctional TiO 2 (R)/VO 2 /TiO 2 (A) multilayer film is designed by Jin et al on a large‐scale glass with area of 400 × 400 mm 2 using magnetron sputtering, as shown in Figure a .…”

Engineered Ionene/PNIPAM Hybrid Dual-Response Material Generating Tunable and Unique Optical Modes for Adaptive Solar Transmittance Modulation

“…It takes 25 min for P100 to reach 17.5% of the total optical contrast value. These obtained switching speed values, however, are relatively low compared to those reported devices with dual-response properties wherein their coloration and bleaching times fall within the range of 0.1–15 s. The fast switching speed of these devices may be attributed to the presence of an electrolyte in the form of a salt/solvent system (lithium salt and propylene carbonate) similar to that of Meng et al and Gao et al . Their presence substantially lowers the glass-transition temperature ( T g ) of the material, which is a measure of how freely the molecules can move in the matrix and as a general rule, the lower the T g , the higher the ionic conductivity is.…”

“…To promote higher functionality, efficiency, and flexibility, an attempt to engineer device bifunctionality has just recently gained attention among researchers. Studies incorporating a thermo-response functionality into these mono-response chromic devices have been initiated. , Several studies in literature reported a dual-response device based on inorganic materials wherein a combination of VO 2 and WO 3 was used, whereas another report employed the blending of TiO 2 and VO 2 . − Although the use of inorganic materials (in terms of their electrochromic activity) is very promising, the activation of their thermal activity is deemed too high for practical applications (color transition happens within the range of 60–90 °C). Another strategy is the development of an organic–inorganic hybrid material wherein PVP-coated tungsten bronze (Cs x WO 3 ) nanorods are mixed with phase-transition liquid crystals (LCs) .…”

A2Cu3In3Te8 (A = Cd, Zn, Mn, Mg): A Type of Thermoelectric Material with Complex Diamond-like Structure and Low Lattice Thermal Conductivities

“…The carrier concentration and mobility were detected by Van der Pauw’s method in a Hall coefficient measurement system. The RT optical band gap was characterized in the near-infrared wavelength range (250–2500 nm) with a U-4150 UV–vis–NIR spectrophotometer (Hitachi, Japan) . The transverse ( ν t ) and longitudinal ( ν l ) sound velocities were examined by the ultrasonic pulse-receiver (Olympus-NDT).…”

“…The RT optical band gap was characterized in the near-infrared wavelength range (250−2500 nm) with a U-4150 UV−vis−NIR spectrophotometer (Hitachi, Japan). 57 The transverse (ν t ) and longitudinal (ν l ) sound velocities were examined by the ultrasonic pulse-receiver (Olympus-NDT). The microstructures of the Cd 2 Cu 3 In 3 Te 8 samples were examined by transmission electron microscopy (Talos F200X, FEI, USA).…”