TPD and ITPD study of materials used as chemoresistive gas sensors |
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| Authors: | D Puzzovio MC Carotta A Cervi A El Hachimi JP Joly F Gaillard V Guidi |
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| Institution: | 1. Department of Physics, University of Ferrara, Ferrara, Italy;2. NFN section of Ferrara, Ferrara, Italy;3. Université Lyon 1, CNRS, UMR 5256, IRCELYON, Institut de recherches sur la catalyse et l''environnement de Lyon, 2 avenue Albert Einstein, F-69626 Villeurbanne, France |
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| Abstract: | 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 to gas 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 O2 (100 Torr, 500 °C, 30 min). Amounts of desorbed O2 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 (Eapp) 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). |
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