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✦   LIBER   ✦

Comparison of IR LED gas sensors with thermal source products

✍ Scribed by Smith, S.D.; Vass, A.; Bramley, P.; Crowder, J.G.; Wang, C.H.

Book ID
114455683
Publisher
The Institution of Electrical Engineers
Year
1997
Tongue
English
Weight
491 KB
Volume
144
Category
Article
ISSN
1350-2433

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Oxygen interaction of CdS-based gas sens
Oxygen interaction of CdS-based gas sensors with different stoichiometric compositions was studied by X-ray photoelectron spectroscopy (XPS) and thermal-desorption mass spectroscopy observations combined with conductivity measurements. Three different types of film with different atomic ratios of Cd/S were used in the study of oxygen chemisorption in a low-temperature range between 300 and 570 K. Spray pyrolysis was used for the deposition of the films on glass substrates; XPS and energy dispersive spectroscopy of X-ray together with atomic force microscopy and scanning electron microscopy were used for the characterization of the composition and structure of the films. It was possible to distinguish different temperature ranges for the thermal desorption of the different adsorbed oxygen species. A comparison of the data from XPS and mass-spectroscopy observations with conductance measurements allows to conclude that metallic surface atoms are responsible for different interactions of oxygen species with CdS surfaces.
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