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Different shaped K 0.3 WO 3 blue pigments were prepared by a simple solvothermal method. The as-synthesized K 0.3 WO 3 pigments were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and spectrophotometer. It's found that the concentration of WCl 6 had a great influence on the morphology of K 0.3 WO 3 pigments. Spindlelike K 0.3 WO 3 composed of nanorods, microsphere structures composed of nanorods and microflower structures composed of nanosheets could be obtained with an increasing WCl 6 concentration. The obtained spindle shaped K 0.3 WO 3 showed higher near infrared shielding ability than that of K 0.3 WO 3 microspheres and microflowers. The reason could be attributed to the enhanced local surface plasmon resonance absorption induced by higher aspect ratio and higher free carrier concentrations of spindleliked K 0.3 WO 3 . An approximately 8.5 °C decrease in inner temperature was obtained for the heat box covered with K 0.3 WO 3 coated glass. Therefore, the synthesized K 0.3 WO 3 blue pigments with high visible light transparency and high near infrared shielding ability have the potential to be applied in smart window coatings to reduce the heat build-up. [ABSTRACT FROM AUTHOR]

Abstract Series of novel K 0.3 WO 3 /Ag 2 O nanocomposites were successfully prepared by simple two steps method. An exciting fact that near-infrared light shielding and visible photocatalytic self-cleaning effects are integrated into the K 0.3 WO 3 /Ag 2 O film (weight ratio of K 0.3 WO 3 to Ag 2 O = 30) could offer significant potential applications in smart windows. Furthermore, the optical properties and photocatalytic activity of the composites could be tuned by adjusting the weight ratio of K 0.3 WO 3 to Ag 2 O. The obtained K 0.3 WO 3 /Ag 2 O films presented enhanced photocatalytic self-cleaning performance compared with pure K 0.3 WO 3 under visible light irradiation. The improved self-cleaning performance of the K 0.3 WO 3 /Ag 2 O composites was ascribed to a combined contribution of the matched energy band structures and boosted separation efficiency of photo-generated carriers. An approximately 2.3°C-3.4 °C decrease in inner temperature was obtained for the heat box covered with K 0.3 WO 3 /Ag 2 O coated glass. Therefore, the proposed K 0.3 WO 3 /Ag 2 O (weight ratio of K 0.3 WO 3 to Ag 2 O = 30) smart coating is a promising material for self-cleaning energy-saving windows. Graphical abstract Image 1 Highlights • K 0.3 WO 3 /Ag 2 O nanocomposites were prepared by simple two steps method. • The nanocomposites show nice visible light transmittance. • The nanocomposites show strong NIR shielding performance. • The nanocomposite coatings showed good thermal insulation property. • The nanocomposite coatings enhanced self-cleaning property. [ABSTRACT FROM AUTHOR]

Ag nanoparticles were uniformly attached to the surface of K 0 · 3 WO 3 nanorods by the chemical reduction method. The photocatalytic performance and NIR shielding property of the nanocomposites could be regulated by changing the mass ratio of Ag to K 0 · 3 WO 3. The NIR shielding ability of the nanocomposites was as high as 49.8%. The prepared K 0 · 3 WO 3 /Ag nanocomposites exhibited improved visible photocatalytic performance, resulting in an enhanced self-cleaning property of K 0 · 3 WO 3 /Ag films. The improvement in visible photocatalytic activity of the K 0 · 3 WO 3 /Ag nanocomposites could be attributed to the improved separation efficiency of photo-generated carriers. Furthermore, K 0 · 3 WO 3 /Ag coated glass can reduce the interior temperature of the heat box by 2.4 °C. Therefore, the integration of good visible light transmittance, superior visible photocatalytic self-cleaning property, and strong NIR shielding performance make K 0 · 3 WO 3 /Ag nanocomposites good candidates for smart window coatings. Image 1 • K 0 · 3 WO 3 /Ag nanocomposites were prepared. • The nanocomposites exhibit good visible light transmittance. • The nanocomposites can shield nearly 50% of near-infrared light. • The nanocomposite coatings show superior thermal insulation performance. • The nanocomposite coatings exhibit enhanced self-cleaning property. [ABSTRACT FROM AUTHOR]