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2017-07-05 - Colloque/Présentation - communication orale - Anglais - 10 page(s)

Tang X., Lahem Driss, Raskin J.-P., Debliquy Marc , "A Hybrid Gas Sensor Based On Compound Of Graphene With Polypyrrole" in SMT31 - International Conference on Surface Modification Technologies, Mons, Belgique, 2017

  • Codes CREF : Capteurs et périphériques (DI2563)
  • 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)

Abstract(s) :

(Anglais) In this work, we design a new hybrid sensor in which graphene (G) combined with an ultrathin polypyrrole (PPy) layer is employed for the sensing layer. The sensor consists in a CVD grown graphene transferred on top of an insulator substrate and an ultrathin PPy layer deposited on graphene by electropolymerization. Here, the thin PPy layer with porous nature plays important roles for the sensor sensitivity, selectivity and response/recovery times. Graphene serves as a support material for the PPy electropolymerization and also provides the efficient pathway for electron transfer. The present sensor is used to detect ammonia (NH3) and shows high response (in the ppm range) at room temperature. The sensor also exhibits a good selectivity for NH3 compared with other interference gases and rather good immunity to humidity. The results indicate that the combination of PPy and G is a very promising as a chemical sensor material. Our research is beneficial forward the commercial design and fabrication of sensors fulfilling the specifications of praticalreal applications.