Fabrication of VO2-based multilayer structure with variable emittance

Wang, Xiao; Cao, Yunzhen; Zhang, Yuzhi; Lü, Yan; Liu, Ying

doi:10.1016/j.apsusc.2015.03.116

Cited by 64 publications

(35 citation statements)

References 25 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S1 67 , 68 . Furthermore, the presented differences in the hysteresis loops width is mainly linked to the nature of the substrate and the granularity of the VO 2 , as reported in the literature 21 , 69 , 70 . In a VO 2 single crystal, during the MIT, physical properties present strong variations (a variation of electrical resistivity of five orders of magnitude and more than 80% of optical transmission in the near IR range) in a very narrow temperature range (less than 1 K) around the transition temperature.…”

Section: Discussionmentioning

confidence: 55%

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

Hamaoui

Horny

Gomez-Heredia

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Hysteresis loops exhibited by the thermophysical properties of VO 2 thin films deposited on either a sapphire or silicon substrate have been experimentally measured using a high frequency photothermal radiometry technique. This is achieved by directly measuring the thermal diffusivity and thermal effusivity of the VO 2 films during their heating and cooling across their phase transitions, along with the film-substrate interface thermal boundary resistance. These thermal properties are then used to determine the thermal conductivity and volumetric heat capacity of the VO 2 films. A 2.5 enhancement of the VO 2 thermal conductivity is observed during the heating process, while its volumetric heat capacity does not show major changes. This sizeable thermal conductivity variation is used to model the operation of a conductive thermal diode, which exhibits a rectification factor about 30% for small temperature differences (≈70 °C) on its terminals. The obtained results grasp thus new insights on the control of heat currents.

show abstract

Section: Discussionmentioning

confidence: 55%

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

Hamaoui

Horny

Gomez-Heredia

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Our reported Δε of 0.48 equals the best literature value of unpatterned films obtained using a lowemissivity HfO2 dielectric spacer. 7 We expect that further improvements will be achievable when combining our meta-OSR concepts with such specialized low-emittance materials. Figure 4c shows the extracted solar absorptance α as a function of feature size for VO2 reflectors at different gaps measured at 25°C and 80°C.…”

Section: Sem Images Of the Experimental Structures Are Presented Inmentioning

confidence: 99%

VO₂ Thermochromic Metamaterial-Based Smart Optical Solar Reflector

et al. 2018

View full text Add to dashboard Cite

Optical solar reflector smart radiators are able to control the temperature of spacecraft. This work demonstrates a novel smart optical solar reflector using a patterned thermo-chromic VO2 plasmonic meta-surface design. The VO2 meta-surface combines the temperature induced phase transition of VO2 with plasmonic resonances resulting in a significant enhancement of the infrared absorption. The enhanced absorption obtained at a reduced VO2 coverage results in superior emittance tunability Δε and lower solar absorptance α compared to a corresponding thin-film reflector. An emittance tunability of 0.48 is obtained for the meta-reflector design, representing a 30% improvement compared to the unstructured film. Meta-surface based smart optical solar reflectors offer a new route toward energyefficient and cost-effective passive thermal control systems of spacecraft and other surfaces.

show abstract

“…In the FIR region, the structure of VO2/spacer/metal multilayer has gained much attention for its simple preparation in structure, the high emittance at targeted wavelength and the excellent regulation of emittance, which is attributed to the switchable excitation of FP resonance. [32] For the low temperature (semiconducting) state of the VO2 layer, lights could be simply reflected by the Ag back layer through the transparent HfO2 and VO2 layers in the FIR region. As a result, the multilayer, acting like a metal reflector, exhibits a strongly suppressed emissivity.…”

Section: Vo2 Multilayer Metasurfacementioning

confidence: 99%

Adaptive Multiple-band Absorber Based on VO2 Metasurface

Ma¹,

Fan²

2021

ES Energy Environ.

View full text Add to dashboard Cite

The applications of present absorbers encounter the bottleneck of its single-band and static resonance peak. To overcome these obstacles, we proposed a multiple-band absorber out of phase transition material vanadium dioxide (VO2), and demonstrated the switch and modulation of resonances. The proposed VO2 metasurface can excite complex resonances via the top nanoparticle component and Fabry-Perot(FP) resonance via the bottom multilayer component, respectively. And these resonances can be tailored independently by controlling geometrical parameters and switched on and off by varying its temperatures. The physical mechanisms of these resonances are elucidated through an analysis of electromagnetic field distributions. This synergy of multiple resonances on VO2-based metasurface provides a novel and facile way to build adaptive multiple-band absorbers, which may inspire developments in adaptive radiative cooling, thermal management as well as other applications.

show abstract

Fabrication of VO2-based multilayer structure with variable emittance

Cited by 64 publications

References 25 publications

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

VO₂ Thermochromic Metamaterial-Based Smart Optical Solar Reflector

Adaptive Multiple-band Absorber Based on VO2 Metasurface

Contact Info

Product

Resources

About

Fabrication of VO2-based multilayer structure with variable emittance

Cited by 64 publications

References 25 publications

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

VO2 Thermochromic Metamaterial-Based Smart Optical Solar Reflector

Adaptive Multiple-band Absorber Based on VO2 Metasurface

Contact Info

Product

Resources

About

VO₂ Thermochromic Metamaterial-Based Smart Optical Solar Reflector