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Enhanced passive thermal stealth properties of VO2 thin films via gradient W doping

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Title
Enhanced passive thermal stealth properties of VO2 thin films via gradient W doping
Author(s)
Kim, Hyuk Jin; Choi, Young Hwan; Lee, Dongkyu; Lee, In Hak; Choi, Byoung Ki; Soo-Hyon Phark; Chang, Young Jun
Publication Date
2021-09
Journal
Applied Surface Science, v.561
Publisher
Elsevier B.V.
Abstract
© 2021 Elsevier B.V.Thermal stealth and camouflage have been intensively studied for blending objects with their surroundings against remote thermal image detection. Adaptive control of infrared emissivity has been explored extensively as a promising way of thermal stealth, but it still requires an additional feedback control. Passive modulation of emissivity, however, has been remained as a great challenge which requires a precise engineering of emissivity over wide temperature range. Here, we report a drastic improvement of passive camouflage thin films capable of concealing thermal objects at near room temperature without any feedback control, which consists of a vanadium dioxide (VO2) layer with gradient tungsten (W) concentration. The gradient W-doping widens the metal-insulator transition width, accomplishing self-adaptive thermal stealth with a smooth change of emissivity. Our simple approach, applicable to other similar thermal camouflage materials for improving their passive cloaking, will find wide applications, such as passive thermal camouflage, urban energy-saving smart windows, and improved infrared sensors.
URI
https://pr.ibs.re.kr/handle/8788114/10079
DOI
10.1016/j.apsusc.2021.150056
ISSN
0169-4332
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > 1. Journal Papers (저널논문)
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