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KMID : 1059520190630020094
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Journal of the Korean Chemical Society
2019 Volume.63 No. 2 p.94 ~ p.101
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Synthesis and Characterization of Nb, Mo-doped and Nb/Mo-codoped Monoclinic VO2 Nanoparticles and Their Thin Films by Hydrothermal/Post-Thermal Transformation and Wet-Coating Method
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Kim Jong-Min
Jung Young-Hee
Kwak Jun-Young
Kim Yeong-Il
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Abstract
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Nb, Mo-doped and Nb/Mo-codoped VO2(M) nanocrystallites with various doping levels were synthesized for the first time by a hydrothermal and post thermal transformation method. The reversible phase transition characteristics of those doped VO2(M) was comparatively investigated. Nb-doping of VO2(M) by this method resulted in a very efficient lowering of the transition temperature (Tc) with a rate of -16.7 oC/at.% that is comparable to W-doping, while Mo-doping did not give a serious reduction of Tc with only a rate of -5.1 oC/at.%. Nb/Mo-codoping gave a similar result to Nb-doping without a noticeable difference. The thin films of Nb-doped and Nb/Mo-codoped VO2(M) with a thickness of ca. 120 nm were prepared by a wet-coating of the nanoparticle-dispersed solutions. Those films showed a good thermochromic modulation of near infrared radiation with 30-35% for Nb-doped VO2(M) and 37-40% for Nb/Mo-codoped ones. Nb/Mo-codoped VO2(M) film showed slightly enhanced thermochromic performance compared with Nb-doped VO2(M) film.
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KEYWORD
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VO2(M), Thermochromic, Semiconductor-to-metal phase transition, Nb-doping, Nb/Mo-codoping
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