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2010-09-05 - Colloque/Présentation - poster - Anglais - 2 page(s)

Boudiba Abdelhamid , Zhang Chao, Navio Bernabeu Cristina, Bittencourt Carla , Olivier Marie-Georges , Snyders Rony , Debliquy Marc , "Success preparation of highly selective, sensitive and stable hydrogen sensor based on Pd-doped tungsten trioxide" in EUROSENSORS XXIV , Linz, Austria

  • Codes CREF : Chimie des surfaces et des interfaces (DI1327), Physique appliquée des surfaces (DI2723), Physique des plasmas (DI1233)
  • 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) This work summarizes the way of preparation of highly selective, sensitive and stable hydrogen sensor based on Pd-doped tungsten trioxide. Two different morphologies of WO3 were obtained by chemical route synthesis (WO3 spherical nano-particles and WO3 micro-lamellae) and then, palladium chloride salt/ WO3 powder were highly dispersed in organic solution using sonication. The resultant Pd-WO3 dispersed was drop coated on the alumina substrate fitted with cold electrodes and annealed at 500°C. The gas sensing properties to reducing gases (NH3, CO, H2) were carried out in the range of ppm for different operating temperatures. The sensors have shown a very high selectivity to hydrogen at working temperature of 200°C with significant response. The sensor with low Pd loading (0.4 wt%) has shown the best stability and reproducibility. In these last conditions, the sensors have shown any response to ammonia (= 1ppm) and insignificant response to carbon monoxide (= 200 ppm).