Microwave properties of the thermal metal-semiconductor transition of the polyaniline-VO2 composites

L. Hachet; Ph. Roduit; H. de Chanterac; N. Belhadj-Tahar; Arlette Fourrier-Lamer

doi:10.1117/12.390570

30 June 2000 Microwave properties of the thermal metal-semiconductor transition of the polyaniline-VO₂ composites

L. Hachet, Ph. Roduit, H. de Chanterac, N. Belhadj-Tahar, Arlette Fourrier-Lamer

Proceedings Volume 4097, Complex Mediums; (2000) https://doi.org/10.1117/12.390570
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The purpose of this paper is to report the experimental results on polyaniline-VO₂ composites in the 45MHz-18GHz frequencies range versus temperature and VO₂ mass concentration. The temperature dependence studied by classical heating and courant pulse and the percolation phenomena study have been carried out in both the semi- conductor state and metallic state. The VO₂ metallic oxide is remarkable through a reversible discontinuity of the electric conductivity which can reach five orders of magnitude at a transition temperature generally located at 68 degree(s)C. This transition is associated with the modification from crystal structure VO₂ which passes from a quadratic structure (metal state) to a monoclinic structure (semiconductor state) at the temperature T_t. The powder of VO₂ sintered in an induction oven. VO₂ was dispersed in a matrix of basic polyaniline, with mass rates of 10%, 30%, 50%, 70% and 90% of vanadium oxide. The strong dynamics of the composites beyond the threshold authorizes the use of a current to induce the temperature within the sample. The simulation of multi-layer of Jauman type, with commendable reflection and transmission in the frequencies range 8-12GHz will be shown.

Citation Download Citation

L. Hachet, Ph. Roduit, H. de Chanterac, N. Belhadj-Tahar, and Arlette Fourrier-Lamer "Microwave properties of the thermal metal-semiconductor transition of the polyaniline-VO₂ composites", Proc. SPIE 4097, Complex Mediums, (30 June 2000); https://doi.org/10.1117/12.390570

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