A detailed infrared study of the semiconductor-to-metal transition (SMT) in a vanadium dioxide (VO2) film deposited on a silicon wafer is presented. The (VO2) phase transition is studied in the mid-infrared (MIR) region by analyzing the transmittance and the reflectance measurements, and the calculated emissivity. The temperature behavior of the emissivity during the SMT puts into evidence the phenomenon of the anomalous absorption in (VO2) which has been explained by applying the Maxwell-Garnett effective medium approximation theory, together with a strong hysteresis phenomenon, both useful to design tunable thermal devices. Photothermal radiometry has been applied in order to study the changes in the modulated emissivity induced by a laser. Experimental results show how the use of these techniques represent a good tool for a quantitative measurement of the optothermal properties of vanadium dioxide-based structures

Photothermal Characterization of Thermochromic Materials for Tunable Thermal Devices / Li Voti, Roberto; Leahu, Grigore; Larciprete, Maria Cristina; Sibilia, Concetta; Bertolotti, Mario. - In: INTERNATIONAL JOURNAL OF THERMOPHYSICS. - ISSN 0195-928X. - STAMPA. - 36:(2015), pp. 1004-1015. [10.1007/s10765-014-1790-2]

Photothermal Characterization of Thermochromic Materials for Tunable Thermal Devices

Li Voti, Roberto;Leahu, Grigore;Larciprete, Maria Cristina;Sibilia, Concetta;Bertolotti, Mario
2015

Abstract

A detailed infrared study of the semiconductor-to-metal transition (SMT) in a vanadium dioxide (VO2) film deposited on a silicon wafer is presented. The (VO2) phase transition is studied in the mid-infrared (MIR) region by analyzing the transmittance and the reflectance measurements, and the calculated emissivity. The temperature behavior of the emissivity during the SMT puts into evidence the phenomenon of the anomalous absorption in (VO2) which has been explained by applying the Maxwell-Garnett effective medium approximation theory, together with a strong hysteresis phenomenon, both useful to design tunable thermal devices. Photothermal radiometry has been applied in order to study the changes in the modulated emissivity induced by a laser. Experimental results show how the use of these techniques represent a good tool for a quantitative measurement of the optothermal properties of vanadium dioxide-based structures
2015
Emissivity, Phase transition, Photothermal radiometry, Thermochromic materials, Photothermal radiometry, Quantitative measurement Semiconductor-to-metal transitions Temperature behavior
01 Pubblicazione su rivista::01a Articolo in rivista
Photothermal Characterization of Thermochromic Materials for Tunable Thermal Devices / Li Voti, Roberto; Leahu, Grigore; Larciprete, Maria Cristina; Sibilia, Concetta; Bertolotti, Mario. - In: INTERNATIONAL JOURNAL OF THERMOPHYSICS. - ISSN 0195-928X. - STAMPA. - 36:(2015), pp. 1004-1015. [10.1007/s10765-014-1790-2]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1020480
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