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Optical properties of an all-plastic WO3H2O-based infrared modulator

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7 Author(s)
Bessiere, A. ; LCAES, UMR 7574, ENSCP 11 Rue P&M Curie 75231 Paris Cedex 05 FranceLRCS, UMR 6007 CNRS, 33 rue Saint Leu 80039 Amiens Cedex France ; Beluze, L. ; Morcrette, M. ; Viana, B.
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WO3H2O powder embedded in a plastic matrix has demonstrated attractive properties as a flexible emissivity modulator driven by the electrochemical insertion of lithium. The near infrared optical properties of LixWO3H2O are investigated as a function of the lithium intercalation level x for 0≤x≤2.65. The reflectivity at 2.5 μm, measured through a glass window, was found to vary between 0.15 and 0.4 over the α intercalation phase (0≤x≪0.3), i.e., demonstrating an emissivity contrast of ∼0.25. For x≥0.1 the LixWO3H2O-based plastic device exhibits a Drude behavior comparable to that of monoclinic tungsten oxide (m-WO3) thin films. For larger intercalation levels, the performances are affected by some irreversible structural modifications of the LixWO3H2O lattice. © 2004 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:95 ,  Issue: 12 )