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2010-07-05 - Colloque/Présentation - poster - Anglais - 2 page(s)

Boudiba Abdelhamid , Zhang Chao, Navio Cristina, Bittencourt Carla , Snyders Rony , Debliquy Marc , "Effect of high temperature annealing on the microstructure of screen-printed WO3 layers used for gas sensing" in 5th Asia-Pacific Conference on Transducers and Micro-Nano Technology, Perth, Australia, 2010

  • Codes CREF : Capteurs et périphériques (DI2563), Semi-conducteurs (DI2512), Matériaux céramiques et poudres (DI2744)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882), Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP), Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) WO3 nanoparticals were synthesized by direct precipitation and characterized by SEM and TEM microscopy, their crystal-line structures were determined by X-RD. Five annealing temperatures of 600, 700, 800, 900, and 1000° C were used for the nanopowder in air. During the annealing temperature, important changes in the morphology of the WO3 nanopowder have been observed. For gas sensing properties depending on the morphology, WO3 nanopowder annealed at different temperature were homogenously dis-persed in terpineol/methylcellulose by sonication and micro-films layer on alum-na substrate were deposited by screen printing method. The sensors were an-nealed again at 600 °C and their response to NO2 was measured at different operating temperature (180 to 300°C). The sensor with WO3 sensitive layer annealed at 700 °C has been shown the best response to NO2 (0.5, 1 and 2ppm and oppositely for the sensor with nanocubic structures annealed at 800°C.