Electrospinning preparation and near-infrared absorption properties of a silica/cesium tungsten bronze micro-nano fiber membrane

• Published in: RSC advances 2021-09, Vol.11 (49), p.3184-3189
• Main Authors: Song, Yilong, Zhao, Fang, Li, Zhizun, Cheng, Zhaogang, Wan, Hongjing
• Format: Article
• Language: English
• Subjects: Cesium; Chemistry; Crystal structure; Crystallinity; Crystallization; High temperature; Infrared absorption; Infrared radiation; Membranes; Morphology; Near infrared radiation; Phase composition; Raw materials; Roasting; Silicon dioxide; Spectrophotometry; Spinning (materials); Tensile strength; Tetraethyl orthosilicate; Thermal decomposition; Tungsten bronze; X ray photoelectron spectroscopy
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d1ra06157g

Silica/cesium tungsten bronze (SiO 2 /Cs x WO 3 ) composite micro-nano fiber membranes were prepared by the co-precursor electrostatic spinning method using cesium chloride, tungsten powder and tetraethyl orthosilicate as raw materials. TGA, XRD, FT-IR, XPS, SEM and ultraviolet-visible-near red spectrophotometry were used to analyze the thermal decomposition process, phase composition, microscopic morphology and near-infrared absorption properties of the product. Studies have shown that as the ratio of Cs/W of raw materials increases, the crystallinity of Cs x WO 3 in the product increases first and then decreases. When n (Cs)/ n (W) reaches 0.5, its crystallinity is the most complete; similarly, calcination also contributes to the crystallization of Cs 0.33 WO 3 , but high temperatures above 800 °C will also destroy its crystal structure. The study found that after calcination at 700 °C, the fiber membrane with a Cs/W atomic ratio of 0.5 has the best infrared absorption performance. The average absorbance of near-infrared light at 780-2500 nm is 1.5, which is 5.56 times that of the pure SiO 2 fiber membrane. The tensile strength reaches 2.4 MPa, which can meet practical requirements. This research provides a basis for the development of flexible solar shading materials under complex outdoor conditions. A silica/cesium tungsten bronze composite fiber membrane with good near-infrared shielding performance is prepared by electrostatic spinning, and can be used for solar heat insulation.