Spray-coating of cesium tungsten bronze for improved near-infrared shielding in green energy glass

Title : Spray-coating of cesium tungsten bronze for improved near-infrared shielding in green energy glass

Abstract:

In this study, an efficient method for synthesizing CsxWO3 nanocrystals using ammonium metatungstate and cesium carbonate as starting materials is developed. Tartaric acid acted as a reducing agent and chloroplatinic acid as a catalyst. Cesium tungsten bronze (CsxWO3) strongly absorbs near-infrared (NIR) light, making it an ideal candidate for energy-efficient building glass. However, due to its high surface energy, inorganic particles tend to agglomerate into larger particles. Ball milling reduces the particle size, and a nonionic surfactant ensured stable dispersion in organic materials. The CsxWO3 nanoparticle solution spray-coated onto glass extremely enhances near-infrared shielding. With a 2 wt% of CsxWO3 nanoparticle solution the solid content, the coated glass shows a 75.52% visible light transmittance, and 5 wt% of CsxWO3 nanoparticle solution spray-coated glass provides a 54.61% NIR shielding rate. Self-made CsxWO3 gives higher transmittance difference between the highest visible and lowest NIR range about 5~10% compared to that of the commercial CsxWO3 mixed with IPA at 2 wt.% and 5 wt.%.

Biography:

Professor Lung-Hao Hu earned his PhD degrees in the Department of Mechanical Engineering at the University of Colorado Boulder, United States, in 2010. Subsequently, he served as a postdoctoral researcher at several prestigious institutions including CU-Boulder, National Tsing Hua University, and Academia Sinica. During the period spanning from 2007 to 2009, he participated as an exchange scholar from CU-Boulder to the University of Trento, Italy. Presently, Professor Hu holds the position of full professor in the Department of Mechanical and Electro-Mechanical Engineering at National Sun Yat-sen University, Taiwan. His research endeavors encompass a broad spectrum, primarily focusing on the applications of energy materials, nanocomposites, ceramics, surface coatings, and bio-sensing. Specifically, his research interests lie in investigating the physical, chemical, and mechanical properties of surface coatings of Polymer-Derived Ceramics and 2D materials, along with conducting nano-scale analysis to address pertinent research questions.