Comparative study between nanocrystalline powder and thin film of vanadium dioxide VO2:: electrical and infrared properties

The reversible metal insulator phase transition of VO2 (T-c = 68 degreesC) is associated with strong changes in electrical, magnetic and optical properties. Recently, nanopigments were synthesized using the low temperature irreversible structural transformation of the metastable VO2(B). Thin films were deposited under radio-frequency sputtering conditions. The optical transparency is remarkably increased for these nanosized particles and thin films. The VO2 transition is characterized in the mid-infrared (MIR) region, using transmittance, reflectance and normal integrated emissivity measurements, Emissivity and reflectance are analyzed from two independent experimental techniques. (C) 2001 Elsevier Science Ltd. All rights reserved.