Growth of ZnO tetrapods for nanostructure-based gas sensors

Standard vapour phase growth process for ZnO tetrapods has been optimized in order to reach a very large yield, a good reproducibility and a single morphology (tetrapods are separated from the other possible ZnO nanostructures). The large yield of the growth and the simple deposition of these nanost...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2010-02, Vol.144 (2), p.472-478
Main Authors: Calestani, D., Zha, M., Mosca, R., Zappettini, A., Carotta, M.C., Di Natale, V., Zanotti, L.
Format: Article
Language:English
Subjects:
Chemoresistive gas sensors
H 2S
Nanomaterials
Semiconductor oxides
Tetrapods
ZnO
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Summary:Standard vapour phase growth process for ZnO tetrapods has been optimized in order to reach a very large yield, a good reproducibility and a single morphology (tetrapods are separated from the other possible ZnO nanostructures). The large yield of the growth and the simple deposition of these nanostructures on an alumina substrate with contacts and heater, allowed us to realize gas sensor prototypes with a relatively low-cost procedure. The obtained ZnO tetrapods-based gas sensors have been tested with different gases (CH 3CH 2OH, NO 2, CO and H 2S) and, especially, response values S = 25 and S = 100 have been measured towards 1 ppm and 5 ppm of hydrogen sulphide, respectively.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2009.11.009