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

Georges Hamaoui; Nicolas Horny; Cindy Lorena Gomez-Heredia; Jorge Andres Ramirez-Rincon; Jose Ordonez-Miranda; Corinne Champeaux; Frédéric Dumas-Bouchiat; Jose Alvarado-Gil; Younes Ezzahri; Karl Joulain; Mihai Chirtoc

doi:10.1038/s41598-019-45436-0

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

Georges Hamaoui Nicolas Horny Cindy Lorena Gomez-Heredia Jorge Andres Ramirez-Rincon Jose Ordonez-Miranda ^{1, 2} Corinne Champeaux ³ Frédéric Dumas-Bouchiat ³ Jose Alvarado-Gil Younes Ezzahri ^{1, 2} Karl Joulain ^{1, 2} Mihai Chirtoc

1 PPRIME - Institut Pprime

2 TNR - Thermique aux Nano échelles et Rayonnement

FTC - Département Fluides, Thermique et Combustion

3 IRCER-AXE2 - IRCER - Axe 2 : procédés plasmas et lasers

IRCER - Institut de Recherche sur les CERamiques : AXE2

Abstract : Hysteresis loops exhibited by the thermophysical properties of VO2 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 VO2 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 VO2 films. A 2.5 enhancement of the VO2 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.

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

Sciences de l'ingénieur [physics] / Matériaux

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https://hal-unilim.archives-ouvertes.fr/hal-02165695
Contributeur : Beatrice Derory <>
Soumis le : mercredi 26 juin 2019 - 10:10:50
Dernière modification le : jeudi 5 décembre 2019 - 18:08:06

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

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

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