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http://dx.doi.org/10.5012/jkcs.2019.63.2.94

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  

Kim, Jongmin (Department of Chemistry, Pukyong National University)
Jung, Young Hee (Research Laboratory, Adchro, Inc.)
Kwak, Jun Young (Research Laboratory, Adchro, Inc.)
Kim, Yeong Il (Department of Chemistry, Pukyong National University)
Publication Information
Journal of the Korean Chemical Society / v.63, no.2, 2019 , pp. 94-101 More about this Journal
Abstract
Nb, Mo-doped and Nb/Mo-codoped $VO_2(M)$ 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 $VO_2(M)$ was comparatively investigated. Nb-doping of $VO_2(M)$ by this method resulted in a very efficient lowering of the transition temperature ($T_c$) with a rate of $-16.7^{\circ}C/at.%$ that is comparable to W-doping, while Mo-doping did not give a serious reduction of $T_c$ with only a rate of $-5.1^{\circ}C/at.%$. Nb/Mo-codoping gave a similar result to Nb-doping without a noticeable difference. The thin films of Nb-doped and Nb/Mo-codoped $VO_2(M)$ 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 $VO_2(M)$ and 37-40% for Nb/Mo-codoped ones. Nb/Mo-codoped $VO_2(M)$ film showed slightly enhanced thermochromic performance compared with Nb-doped $VO_2(M)$ film.
Keywords
$VO_2$(M); Thermochromic; Semiconductor-to-metal phase transition; Nb-doping; Nb/Mo-codoping;
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