2005, English, Article edition: Selective filter for SnO2 based gas sensors: application to hydrogen trace detection Tournier, Guy; Pijolat, Christophe

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Physical Description
  • text
Published
  • HAL - CCSD
  • 2005
Language
  • English

Edition details

Title
  • Selective filter for SnO2 based gas sensors: application to hydrogen trace detection
Author
  • Tournier, Guy
  • Pijolat, Christophe
Published
  • HAL - CCSD
  • 2005
Physical Description
  • text
Subjects
Notes
  • The main drawback of the SnO2 based gas sensors is their low selectivity. In this study, we present a highly selective hydrogen sensor with minimum cross sensitivity to ethanol, methane, carbon monoxide and hydrogen sulfide. Thick film SnO2 sensors are treated by hexamethyldisiloxane (HMDS) at high temperature (500 – 600°C). After this treatment, the electrical properties of sensors are greatly modified: the sensitivity towards hydrogen is markedly increased and a high selectivity to hydrogen is achieved. In the meantime, transient responses curves to H2 trace are altered: the response and recovery times are longer for treated sensors than for the untreated one. Nevertheless, if the temperature of the sensor is increasing from 450°C to 550°C, the response time notably decreases and the detection of hydrogen trace as low as 250 ppb v/​v is quite possible with a good stability. HMDS treated material has been characterized with different analytical methods: SiO2 formation is confirmed by Fourier transform infrared transmission spectroscopy (FTIR) and scanning electron microscopy (SEM) equipped with X probe. Moreover, temperature programmed desorption (TPD) experiments reveal that surface hydroxyl groups are involved in the HMDS- SnO2 interaction. It could be supposed that a weakly porous Si based coating film overlaps the treated SnO2 material and acts as a molecular sieve. Hydrogen can pass easily through the dense filter whereas the diffusion of other gases, and especially oxygen, is considerably reduced. The increase in sensitivity is explained with a simplified model based on an inversely proportional relation between the conductance of the SnO2 material and the concentration of adsorbed oxygen ions.
  • HAL:hal-00009018, version 1
  • HAL:http:/​/​hal.archives-ouvertes.fr/​hal-00009018/​en/​
  • DOI:10.1016/​j.snb.2004.06.037
Language
  • English
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