Microstructure and electrical-optical properties of cesium tungsten oxides synthesized by solvothermal reaction followed by ammonia annealing |
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Authors: | Jing-Xiao Liu Yoshihiko Ando Fei Shi Kenji Adachi Akikazu Tanaka |
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Affiliation: | a Institute of Multidisciplinary Research for Advanced Material, Tohoku University, Sendai 9808577, Japan b School of Chemistry and Materials, Dalian Polytechnic University, Dalian 116034, PR China c Ichikawa Research Laboratory, Sumitomo Metal Mining Co., Ltd, Japan d Technology Division, Advanced Technology Information Department, Sumitomo Metal Mining Co., Japan |
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Abstract: | Cesium tungsten oxides (CsxWO3) were synthesized by solvothermal reactions using ethanol and 57.1 vol% ethanol aqueous solution at 200 °C for 12 h, and the effects of post annealing in ammonia atmosphere on the microstructure and electrical-optical properties were investigated. Agglomerated particles consisting of disk-like nanoparticles and nanorods of CsxWO3 were formed in the pure ethanol and ethanol aqueous solutions, respectively. The samples retained the original morphology and crystallinity after annealing in ammonia atmosphere up to 500 °C, while a small amount of nitrogen ion were incorporated in the lattice. The as-prepared CsxWO3 sample showed excellent near infrared (NIR) light shielding ability as well as high transparency in the visible light region. The electrical resistivity of the pressed pellets of the powders prepared in pure ethanol and 57.1 vol% ethanol aqueous solution greatly decreased after ammonia annealing at 500 °C, i.e., from 734 to 31.5 and 231 to 3.58 Ω cm, respectively. |
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Keywords: | CsxWO3 Solvothermal reaction Ammonia annealing Electrical properties Optical properties |
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