File(s) under permanent embargo
Inverse opal structure of SnO2 and SnO2 : Zn for gas sensing
conference contribution
posted on 2005-01-01, 00:00 authored by C Baratto, G Faglia, G Sberveglieri, Alessandra SuttiAlessandra Sutti, G Calestani, C DionigiIn 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.
History
Event
IEEE International Conference on Sensors (4th : 2005 : Irvine, California)Pagination
1196 - 1200Publisher
IEEELocation
Irvine, CaliforniaPlace of publication
Piscataway, N. J.Publisher DOI
Start date
2005-10-30End date
2005-11-03ISBN-13
9780780390560ISBN-10
0780390563Language
engPublication classification
E1.1 Full written paper - refereedCopyright notice
2005, IEEETitle of proceedings
IEEE Sensors 2005 : 30 October - 3 November 2005, Irvine, CaliforniaUsage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC