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Optical Properties of a Thermochromic Film Fabricated with Nanoporous Monoclinic VO2 Particles
D. Jung, U. Kim, K. Hwang
Korea Institute of Ceramic Engineering & Technology, Icheon, Gyeonggi-do, 17303, Republic of Korea
received February 24, 2020, received in revised form July 21, 2020, accepted July 26, 2020
Vol. 11, No. 2, Pages 73-80 DOI: 10.4416/JCST2020-00004
Abstract
Monoclinic vanadium dioxide (VO2 (M)) powder was synthesized by injecting air over a vanadium precursor powder at 190 °C for 1 h. The reversible metal-insulator phase transition was observed at 67 °C under heating conditions and at 61 °C under cooling conditions based on thermal and electrical property analysis. The VO2 (M) powder has a porous nanorod structure required to realize excellent optical performance. The VO2 (M) powder was mixed with an acrylic resin to fabricate VO2 films on glass substrates. The films consisting of porous VO2 particles exhibited a clear difference in optical performance as a function of the coating thickness. The glass with the thinnest coating of 33.5 nm showed a higher transmittance of the visible light (as high as 86 %) and inferior NIR switching performance (as low as 15 %). A thicker coating leads to decreased visible light transmittance and improved NIR switching performance; the glass with a coating thickness of 70 nm exhibited the best NIR switching performance of 31 %. However, the visible-light transmittance decreased and the NIR switching performance deteriorated significantly when the coating was significantly thick. This suggests that controlling the film thickness is a key factor for achieving excellent optical performance of the VO2 film.
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Keywords
Vanadium dioxide, thin film, optical transparency, thermochromic effect, NIR protection
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