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Direct formation of highly porous gas-sensing films by in situ thermophoretic deposition of flame-made Pt/SnO2 nanoparticles

Mädler, L. and Roessler, A. and Pratsinis, S. E. and Sahm, T. and Gurlo, A. and Barsan, N. and Weimar, U. (2006):
Direct formation of highly porous gas-sensing films by in situ thermophoretic deposition of flame-made Pt/SnO2 nanoparticles.
In: Sensors and Actuators B: Chemical, 114 (1), Elsevier, pp. 283-295, ISSN 09254005,
[Online-Edition: http://dx.doi.org/10.1016/j.snb.2005.05.014],
[Article]

Abstract

Flame spray pyrolysis (FSP) was used to make pure and Pt-doped tin dioxide nanoparticles in one-step. The aerosol generated by the dry FSP method was directly, in situ thermophoretically deposited onto interdigitated Pt-electrodes to form a porous, thick film of controlled thickness within the active sensor area. Tin oxide grain size (10 nm) and a high film porosity (98%) were preserved for all film thicknesses from 9 to 40 μm using different deposition times. The dependence of the film thickness on deposition time was theoretically estimated to enable precise control of the deposition process. Platinum doping did not affect the SnO2 grain size, crystallinity, or the porous film structure. These sensors exhibited high carbon monoxide (CO) sensor signals (8 for 50 ppm CO in dry air at 350 °C), good reproducibility, high analytical sensitivity and a remarkably low detection limit (1 ppm CO in dry air at 350 °C). The in situ platinum doping enhanced the overall sensor performance. Increasing the film thickness increased the sensor resistance and can be used to tune sensor performance.

Item Type: Article
Erschienen: 2006
Creators: Mädler, L. and Roessler, A. and Pratsinis, S. E. and Sahm, T. and Gurlo, A. and Barsan, N. and Weimar, U.
Title: Direct formation of highly porous gas-sensing films by in situ thermophoretic deposition of flame-made Pt/SnO2 nanoparticles
Language: English
Abstract:

Flame spray pyrolysis (FSP) was used to make pure and Pt-doped tin dioxide nanoparticles in one-step. The aerosol generated by the dry FSP method was directly, in situ thermophoretically deposited onto interdigitated Pt-electrodes to form a porous, thick film of controlled thickness within the active sensor area. Tin oxide grain size (10 nm) and a high film porosity (98%) were preserved for all film thicknesses from 9 to 40 μm using different deposition times. The dependence of the film thickness on deposition time was theoretically estimated to enable precise control of the deposition process. Platinum doping did not affect the SnO2 grain size, crystallinity, or the porous film structure. These sensors exhibited high carbon monoxide (CO) sensor signals (8 for 50 ppm CO in dry air at 350 °C), good reproducibility, high analytical sensitivity and a remarkably low detection limit (1 ppm CO in dry air at 350 °C). The in situ platinum doping enhanced the overall sensor performance. Increasing the film thickness increased the sensor resistance and can be used to tune sensor performance.

Journal or Publication Title: Sensors and Actuators B: Chemical
Volume: 114
Number: 1
Publisher: Elsevier
Uncontrolled Keywords: Tin dioxide, Platinum, gas sensors, Flame spray pyrolysis, In situ deposition
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Apr 2012 08:44
Official URL: http://dx.doi.org/10.1016/j.snb.2005.05.014
Identification Number: doi:10.1016/j.snb.2005.05.014
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