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

Title
Enhanced passive thermal stealth properties of VO2 thin films via gradient W doping
Authors
Kim H.J.Choi Y.H.Lee D.Lee I.H.Choi B.K.Phark S.-H.Chang Y.J.
Ewha Authors
박수현
SCOPUS Author ID
박수현scopus
Issue Date
2021
Journal Title
Applied Surface Science
ISSN
0169-4332JCR Link
Citation
Applied Surface Science vol. 561
Keywords
Infrared emissionMetal-insulator transition (MIT)Thermal stealthTransmission electron microscopy (TEM)Vanadium dioxide (VO2)
Publisher
Elsevier B.V.
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
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. © 2021 Elsevier B.V.
DOI
10.1016/j.apsusc.2021.150056
Appears in Collections:
연구기관 > 기초과학연구소 > Journal papers
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