[en] 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.
Research center :
CRIM - Ingénierie des matériaux
Disciplines :
Computer science Physics
Author, co-author :
Zhang, Chao
Wang, Jie
Olivier, Marie-Georges ; Université de Mons > Faculté Polytechnique > Service de Science des Matériaux
Debliquy, Marc ; Université de Mons > Faculté Polytechnique > Science des Matériaux
Language :
English
Title :
Room temperature nitrogen dioxide sensors based on N719-dye sensitized amorphous zinc oxide sensors performed under visible-light illumination
Publication date :
15 March 2015
Journal title :
Sensors and Actuators. B, Chemical
ISSN :
0925-4005
Publisher :
Elsevier Sequoia, Lausanne, Switzerland
Volume :
209
Pages :
69-77
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
F502 - Science des Matériaux
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
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