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2015-03-15 - Article/Dans un journal avec peer-review - Anglais - 9 page(s)

Zhang Chao, Wang Jie, Olivier Marie-Georges , Debliquy Marc , "Room temperature nitrogen dioxide sensors based on N719-dye sensitized amorphous zinc oxide sensors performed under visible-light illumination" in Sensors and Actuators. B, Chemical, 209, 69-77

  • Edition : Elsevier Science
  • 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) tA metal oxide gas sensor working at room temperature has been achieved by impregnating N-719 dyeonto an as-sputtered amorphous zinc oxide (ZnO) film. The amorphous ZnO films exhibit a higher electri-cal conductivity when compared to well-crystallized ZnO films, and the conductivity is further enhancedby sensitization of N-719 dye under visible-light illumination. At room temperature, the dye sensitizedamorphous ZnO sensors are exposed to nitrogen dioxide (NO2) at a concentration ranging from 1.25 to10 ppm under visible-light illumination. The sensor response is 143% for 1.25 ppm NO2and the responseincreases linearly with the NO2concentration. The improvements of gas sensitization are attributed tothe enhancement of NO2chemisorption and desorption rate by photogenerated electrons under dye sen-sitization and light illumination. In addition, the effect of humidity on base resistance and sensor responseis discussed in detail.