Inverse opal structure of SnO2 and SnO2 : Zn for gas sensing

Baratto, C., Faglia, G., Sberveglieri, G., Sutti, A., Calestani, G. and Dionigi, C. 2005, Inverse opal structure of SnO2 and SnO2 : Zn for gas sensing, in IEEE Sensors 2005 : 30 October - 3 November 2005, Irvine, California, IEEE, Piscataway, N. J., pp. 1196-1200, doi: 10.1109/ICSENS.2005.1597920.

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Title Inverse opal structure of SnO2 and SnO2 : Zn for gas sensing
Author(s) Baratto, C.
Faglia, G.
Sberveglieri, G.
Sutti, A.ORCID iD for Sutti, A.
Calestani, G.
Dionigi, C.
Conference name IEEE International Conference on Sensors (4th : 2005 : Irvine, California)
Conference location Irvine, California
Conference dates 30 October - 3 November 2005
Title of proceedings IEEE Sensors 2005 : 30 October - 3 November 2005, Irvine, California
Editor(s) [Unknown]
Publication date 2005
Conference series International Conference on Sensors
Start page 1196
End page 1200
Publisher IEEE
Place of publication Piscataway, N. J.
Summary In the present work, we propose a low cost synthetic sol-gel route that allows to produce high quality oxide nanostructures with inverse opal architecture which, transferred on alumina substrates provided with Pt interdigitated contacts and heater, are tested as gas sensing devices. An opal template of sintered monodisperse polystyrene spheres was filled with alcoholic solutions of metal oxide precursors and transferred on the alumina substrate. The polystyrene template was removed by thermal treatment, leading to the simultaneous sintering of the oxide nanoparticles. Beside SnO2, a binary oxide well known for gas sensing application, a Zn containing ternary solid solution (SnO2:Zn, with Zn 10% molar content) was taken into account for sensor preparation. The obtained high quality macro and meso-porous structures, characterized by different techniques, were tested for pollutant (CO, NO2) and interfering (methanol) gases, showing that very good detection can be reached through the increase of surface area offered by the inverse opal structure and the tailoring of the chemical composition. The electrical characterization performed on the tin dioxide based sensors shows an enhancement of the relative response towards NO2 at low temperatures in comparison with conventional SnO2 sensors obtained with sputtering technique. The addition of Zn increases the separation between the operating temperatures for reducing and oxidizing gases and results in a further enhancement of the selectivity to NO2 detection.
ISBN 9780780390560
Language eng
DOI 10.1109/ICSENS.2005.1597920
Field of Research 039999 Chemical Sciences not elsewhere classified
HERDC Research category E1.1 Full written paper - refereed
Copyright notice ©2005, IEEE
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