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On the Low-Temperature Response of Semiconductor Gas Sensors
Joint Authors
Eickhoff, M.
Müller, Gerhard
Helwig, A.
Sberveglieri, G.
Source
Issue
Vol. 2009, Issue 2009 (31 Dec. 2009), pp.1-17, 17 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2009-07-15
Country of Publication
Egypt
No. of Pages
17
Main Subjects
Abstract EN
The present paper compares three different kinds of semiconductor gas sensing materials: metal oxides (MOX), hydrogen-terminated diamond (HD), and hydrogenated amorphous silicon (a-Si:H).
Whereas in MOX materials oxygen is the chemically reactive surface species, HD and a-Si:H are covalently bonded semiconductors with hydrogenterminated surfaces.
We demonstrate that these dissimilar semiconductor materials exhibit the same kind of low-temperature gas response.
This low-temperature response-mechanism is mediated by a thin layer of adsorbed water with the semiconductor materials themselves acting as pH sensors.
In this adsorbate-limited state the gas sensitivity is limited to molecular species that can easily dissolve in H2O and subsequently undergo electrolytic dissociation.
At higher temperatures, where a closed layer of adsorbed water can no longer exist, the gas response is limited by direct molecule-semiconductor interactions.
In this latter mode of operation, MOX gas sensors respond to adsorbed gases according to their different oxidising or reducing properties.
Hydrogenated amorphous silicon (a-Si:H), on the other hand, exhibits a significantly different cross sensitivity profile, revealing that gas-surface interactions may largely be restricted to analyte molecules with lone-pair and electron-deficient three-centre orbitals.
American Psychological Association (APA)
Helwig, A.& Müller, Gerhard& Sberveglieri, G.& Eickhoff, M.. 2009. On the Low-Temperature Response of Semiconductor Gas Sensors. Journal of Sensors،Vol. 2009, no. 2009, pp.1-17.
https://search.emarefa.net/detail/BIM-485783
Modern Language Association (MLA)
Helwig, A.…[et al.]. On the Low-Temperature Response of Semiconductor Gas Sensors. Journal of Sensors No. 2009 (2009), pp.1-17.
https://search.emarefa.net/detail/BIM-485783
American Medical Association (AMA)
Helwig, A.& Müller, Gerhard& Sberveglieri, G.& Eickhoff, M.. On the Low-Temperature Response of Semiconductor Gas Sensors. Journal of Sensors. 2009. Vol. 2009, no. 2009, pp.1-17.
https://search.emarefa.net/detail/BIM-485783
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-485783