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Enhanced passive thermal stealth properties of VO2 thin films via gradient W doping
- Enhanced passive thermal stealth properties of VO2 thin films via gradient W doping
- Kim H.J.; Choi Y.H.; Lee D.; Lee I.H.; Choi B.K.; Phark S.-H.; Chang Y.J.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Applied Surface Science
- Applied Surface Science vol. 561
- Infrared emission; Metal-insulator transition (MIT); Thermal stealth; Transmission electron microscopy (TEM); Vanadium dioxide (VO2)
- Elsevier B.V.
- SCIE; SCOPUS
- Document Type
- 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.
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- 연구기관 > 기초과학연구소 > Journal papers
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