Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85810
Title: Enhanced transition-temperature reduction in a half-sphere Au/VO2 core-shell structure : local plasmonics versus induced stress and percolation effects
Authors: Wang, Shancheng
Wang, Peikui
Balin, Igal
Long, Yi
Abdulhalim, Ibrahim
Keywords: Energy Research
Materials Science
DRNTU::Engineering::Materials
Issue Date: 2019
Source: Balin, I., Wang, S., Wang, P., Long, Y., & Abdulhalim, I. (2019). Enhanced transition-temperature reduction in a half-sphere Au/VO2 core-shell structure : local plasmonics versus induced stress and percolation effects. Physical Review Applied, 11(3), 034064-. doi:10.1103/PhysRevApplied.11.034064
Series/Report no.: Physical Review Applied
Abstract: VO2 undergoes metal-insulator transition (MIT) at the transition temperature (τc) of 68 °C, accompanied by a sharp optical response change. A unique Au/VO2 half-sphere core-shell structure is fabricated to study the temperature-dependent plasmonic effects and the thermochromic response for smart window applications. By increasing the Au core size, the surface plasmonic resonance wavelength of the VO2 high-temperature rutile phase is tuned from 600 to 720 nm and confirmed by simulations. Meanwhile, τc of VO2 is reduced by up to 10 °C, which is thought to be associated with plasmon-induced or percolation-enhancement-related effects. Modification of τc occurs on the optical domain only and not in the electrical domain. The in-depth analysis suggests that the interaction of the plasmon between Au and VO2 in the near field triggers different mechanisms, which reduce the τc of VO2, in particular under high irradiation levels. However, under normal irradiation levels the main contributing effect is found to be thermal strain at the nanoparticles‘ surface.
URI: https://hdl.handle.net/10356/85810
http://hdl.handle.net/10220/48240
DOI: 10.1103/PhysRevApplied.11.034064
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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