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2010-07-11 - Colloque/Article dans les actes avec comité de lecture - Anglais - 2 page(s)

Boudiba Abdelhamid , Zhang Chao, 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) The aim of this study is to follow the effect of annealing at high temperature on the microstructure of WO3 thick films and their gas sensing properties. WO3 nanoparticles were synthesized by direct precipitation and characterized by SEM microscopy. Their crystalline structures were determined by XRD. The nanopowder was submitted to annealing at 700, 800, 900, and 1000° C in air. Important changes in the morphology have been observed. The treated WO3 nanopowders were homogenously dispersed with various additives to prepare an ink. To measure the conductivity changes, thick layers were deposited by screen printing on alumina substrates fitted with gold electrodes and a platinum heater. Their response to NO2 was measured in the range 0-2 ppm at different operating temperatures. The sensors with WO3 annealed at 800 and 1000°C were similar, however the sensors with WO3 annealed at 700 and 900°C have been shown the best response.