Morphology and phase controlled synthesis of CsxWO3 powders by solvothermal method and their optical properties

Preparation of Monodispersed Cs0.33WO3 Nanocrystals by Mist Chemical Vapor Deposition for Near-Infrared Shielding Application

In this study, single-phase Cs_0.33WO₃ nanocrystals were synthesized by a novel mist chemical vapor deposition method. As prepared, Cs_0.33WO₃ nanocrystals exhibited a microsphere-like appearance constructed with angular crystal grains with an average size of about 30–40 nm. Characterization by X-ray photoelectron spectroscopy indicated that Cs_0.33WO₃ nanocrystals consisted of mixed chemical valence states of tungsten ions W⁶⁺ and W⁵⁺, inducing many free electrons, which could scatter and absorb near-infrared (NIR) photons by plasmon resonance. These Cs_0.33WO₃ microspheres consisted of a loose structure that could be crushed to nanoscale particles and was easily applied for producing long-term stable ink after milling. Herein, a Cs_0.33WO₃/polymer composite was successfully fabricated via the ultrasonic spray coating method using mixed Cs_0.33WO₃ ink and polyurethane acrylate solution. The composite coatings exhibited excellent IR shielding properties. Remarkably, only 0.9 mg cm⁻² Cs_0.33WO₃ could shield more than 70% of NIR, while still maintaining the visible light transmittance higher than 75%. Actual measurement results indicate that it has really good heat insulation properties and shows good prospect in heat insulation window applications.

Facile synthesis of urchin-like CsxWO3 particles with improved transparent thermal insulation using bacterial cellulose as a template

Urchin-like Cs_xWO₃ particles were synthesized using bacterial cellulose (BC) as a template by the hydrothermal method. The effects of the BC addition amount on the morphology, W⁵⁺ content and transparent thermal insulation of Cs_xWO₃ were studied. It has been confirmed that abnormal growth of Cs_xWO₃ rods was greatly reduced after introduction of BC into the precursor solution. Moreover, introduction of BC into the precursor solution could significantly improve the transparent thermal insulation properties of the Cs_xWO₃ film. In particular, when the BC amount was appropriate, the prepared Cs_xWO₃ film exhibited better visible transparency, with the visible light transmittance (T_Vis) more than 60%. In addition, the urchin-like particles could be transformed into small size nanorods after H₂ heat-treatment, exhibiting excellent visible light transparency and thermal insulation performance. In particular, it has been proved that the 20BC-HT-Cs_xWO₃ film exhibits excellent thermal insulation performance, and shows broad application prospects in the field of solar heat filters and energy-saving window glass.

Urchin-like Cs_xWO₃ particles were synthesized using bacterial cellulose (BC) as a template by the hydrothermal method. The BC could greatly reduce the abnormal growth of Cs_xWO₃ rods and improve the transparent heat-insulation properties of Cs_xWO₃ film.

Tuning of the crystal engineering and photoelectrochemical properties of crystalline tungsten oxide for optoelectronic device applications

WO₃crystals with {002} or {111} facets primarily exposed, WO₃films with dominant orientations, doping and heterostructuring are highlighted.