Gas sensing properties of nanocrystalline diamond at room temperature

This study describes an integrated NH3 sensor based on a hydrogenated nanocrystalline diamond (NCD)-sensitive layer coated on an interdigitated electrode structure. The gas sensing properties of the sensor structure were examined using a reducing gas (NH3) at room temperature and were found to be de...

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Bibliographic Details
Published inBeilstein journal of nanotechnology Vol. 5; no. 1; pp. 2339 - 2345
Main Authors Davydova, Marina, Kulha, Pavel, Laposa, Alexandr, Hruska, Karel, Demo, Pavel, Kromka, Alexander
Format Journal Article
LanguageEnglish
Published Germany Beilstein-Institut 04.12.2014
Subjects
Full Research Paper
gas sensor
integrator
interdigitated electrodes
nanocrystalline diamond
Nanoscience
Nanotechnology
response
gas sensor
integrator
interdigitated electrodes
nanocrystalline diamond
response
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Summary:This study describes an integrated NH3 sensor based on a hydrogenated nanocrystalline diamond (NCD)-sensitive layer coated on an interdigitated electrode structure. The gas sensing properties of the sensor structure were examined using a reducing gas (NH3) at room temperature and were found to be dependent on the electrode arrangement. A pronounced response of the sensor, which was comprised of dense electrode arrays (of 50 µm separation distance), was observed. The sensor functionality was explained by the surface transfer doping effect. Moreover, the three-dimensional model of the current density distribution of the hydrogenated NCD describes the transient flow of electrons between interdigitated electrodes and the hydrogenated NCD surface, that is, the formation of a closed current loop.
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ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.5.243