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Role of surface defects and microstructure in infrared optical properties of thermochromic VO2 materials by Frédéric Guinneton; Laurent Sauques; Jean-Christophe Valmalette; Frédéric Cros; Jean-Raymond Gavarri is a Materials Science article available to read on EtoBox.

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Thermochromic vanadium dioxide VO 2 exhibits a semi-conducting to metallic phase transition at T c Z68 8C, involving strong variations in optical transmittance, reflectance and emissivity. However, the optical contrasts observed in thin films or nanostructured compacted samples seem to depend on both surface microstructure and surface crystal texture. In the case of opaque materials, surface defects might play a drastic role in optical reflectivity. As the high temperature metallic phase of VO 2 is opaque for infrared radiations, we used aluminum samples as standards allowing us to correlate reflectivity responses with porosity and surface defects. Then, various polycrystalline and nanostructured VO 2 samples compacted at various pressures and presenting variable surface roughness were prepared. Thin films were deposited by radio frequency sputtering process. The samples were characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Optical properties (reflectance and emissivity) were analyzed above and below the transition temperature, making use of specific FTIR equipments. In thin films, the deposited VO 2 phase was systematically

Who reads Role of surface defects and microstructure in infrared optical properties of thermochromic VO2 materials?

Author

Frédéric Guinneton; Laurent Sauques; Jean-Christophe Valmalette; Frédéric Cros; Jean-Raymond Gavarri

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0022-3697)

Published

2005

Language

EN

Field

Materials Science (Physical Sciences)