Sodium tungsten bronze (Na WO3)-doped near-infrared-shielding bulk glasses for energy-saving applications
| Autor: | Bin Liu, Fang Xia, Guang Yang, Chuanxiang Cao, Haochen Wang, Yunhang Qi, Hongfei Chen, Daming Hu, Liangmiao Zhang, Yanfeng Gao |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Analytical chemistry chemistry.chemical_element 02 engineering and technology Tungsten engineering.material 010402 general chemistry 01 natural sciences chemistry.chemical_compound symbols.namesake Soda lime X-ray photoelectron spectroscopy Materials Chemistry Bronze Sodium tungsten bronze Quenching Mechanical Engineering Doping Metals and Alloys 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials Ceramics and Composites engineering symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Materials Science & Technology. 89:150-157 |
| ISSN: | 1005-0302 |
| Popis: | Tungsten bronze coatings and films have attracted global attention for their applications in near-infrared (NIR)-shielding windows. However, they are unstable in strong ultraviolet, humid heat, alkaline and/or oxidizing environments and are difficult to be coated on glass surfaces with complex shape. Here, we address these limitations by doping sodium tungsten bronze (NaxWO3) into bulk glasses using a simple glass melting method. X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, TEM and SEM-EDS characterization confirmed the presence of sodium tungsten bronze (NaxWO3) functional units inside the 34SiO2-38B2O3-28NaF glass matrix. Because the functional units are well protected by the glass matrix, the fabricated glasses are stable under hot, humid, oxidizing conditions, as well as under ambient conditions, with no change after 360 days. The NIR-shielding performance of these glasses can be adjusted to as high as 100 % by varying WOx concentration (2−8 mol%) and quenching temperature (1000−1400 °C). With a content of 6 mol% WOx and a quenching temperature of 1000 °C, the bulk glass shows 63 % transmission of visible light and only 11 % transmission of NIR light at 1100 nm. Thermal insulation experiments show that the NIR-shielding performance of the glasses are far superior to commercial soda lime window glass or indium-doped tin oxide (ITO) glass, and comparable to cesium tungsten bronze coated glass. The novel bulk glasses have higher stability, simpler processing, and can be easily made into complex shapes, making them excellent alternative materials for energy-saving glasses. |
| Databáze: | OpenAIRE |
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