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2010-09-05 - Article/Dans un journal sans peer-review - Anglais - 4 page(s)

Boudiba Abdelhamid , Zhang Chao, Snyders Rony , Bittencourt Carla , Debliquy Marc , Navio Bernabeu Cristina, "Preparation of highly selective, sensitive and stable hydrogen sensors based on Pd-doped tungsten trioxide" in Procedia Engineering, 5, 180-183

  • Edition : Elsevier (Netherlands)
  • 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) In this paper, highly selective, sensitive and stable hydrogen sensors based on Pd-doped tungsten trioxide were successfully prepared by promoting way. Two different morphologies of WO3 were obtained by chemical route synthesis (WO3 nano-particles and WO3 micro-lamellae), their morphologies were observed by SEM and TEM microscopy and their crystalline structures were determined by X-ray diffraction (XRD). To prepare Pd-doped WO3 films, palladium chloride salt/WO3 was highly dispersed in organic solution using sonication, the resultant Pd–WO3 dispersion was drop coated on the alumina substrate fitted with gold electrodes and annealed at 500 °C. The gas sensing properties of Pd-doped WO3 films to reducing gases (NH3, CO, H2) were studied at different operating temperatures. The sensors have shown high sensitivity and selectivity to hydrogen at working temperature of 200 °C. The sensors with low Pd loading (0.4 wt%) has shown the best stability and reproducibility. In these last conditions, the sensors have shown no obvious response to ammonia (=1 ppm) and insignificant response to carbon monoxide (=200 ppm).