TPD and ITPD study of materials used as chemoresistive gas sensors

D. Puzzovio (1) , M. C. Carotta , A. Cervi , A. El Hachimi , J. P. Joly (1) , F. Gaillard (1) , V. Guidi

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

Temperature-programmed desorption (TPD) and a differential form of it, called intermittent temperature-programmed desorption (ITPD), turned out to be powerful characterising techniques for chemoresistive materials applied togas sensing. We investigated samples of SnO2, TiO2 and solid solutions of them (TixSn1-xO2). TPD and ITPD experiments were carried out in vacuum, with samples previously treated in pure O-2 (100 Torr, 500 degrees C, 30 min). Amounts of desorbed O-2 corresponded for all Ti-containing samples to less than 10% of a compact monolayer of ions O2-. Corresponding values of the apparent activation energy of desorption (E-app) were calculated directly from the Arrhenius plots for each partial TPD and ranged from about 100 to 330 kJ mol(-1) (1.16 to 3.82 eV). (C) 2009 Elsevier B.V. All rights reserved.

Domaines: Catalyse

D. Puzzovio, M. C. Carotta, A. Cervi, A. El Hachimi, J. P. Joly, et al.. TPD and ITPD study of materials used as chemoresistive gas sensors. Solid State Ionics, 2009, 180 (36-39), pp.1545-1552. ⟨10.1016/j.ssi.2009.10.007⟩. ⟨hal-00463194⟩