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2014-05-21 - Colloque/Présentation - communication orale - Anglais - 5 page(s)

Zhang Chao, Li Hanlong, He P., Liao Hanlin, Olivier Marie-Georges , Debliquy Marc , "Microstructural characterization and gas sensing properties of solution precursor plasma- sprayed zinc oxide (ZnO) nanostructured coatings" in International Thermal Spray Conference ITSC 2014, May 21-23 , Barcelona, Spain, 2014

  • Codes CREF : Capteurs et périphériques (DI2563), Matériaux optiques (DI1256)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)
Texte intégral :

Abstract(s) :

(Anglais) ZnO nanostructured coatings have been prepared on Al2O3 substrates fitted with interdigitated Au electrodes on one side and a Pt heater on the other side, and explored as a gas sensor. ZnO coatings were deposited by solution precursor plasma spray (SPPS) using zinc acetate Zn(CH3COO)2 aqueous solution as spraying precursor solution. The SPPS process has proven its simplicity and reliability in realizing polycrystalline ZnO coatings as verified by XRD structural analysis. The FE-SEM images confirmed that the coatings are nanostructured with grain size ranging from 50 to 100 nm. The surface morphology and grain size of coatings is influenced by H2 gas flow rate in plasma forming gas. The sensing properties of sensors based on the SPPS ZnO coatings to NO2 were characterized and the sensors showed good sensitivity to NO2 gas in sub-ppm range