Enhancing performance of FSP SnO2-based gas sensors through Sb-doping and Pd-functionalization |
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| Authors: | Katharina Groß mannAuthor Vitae,Krisztina E. Ková csAuthor VitaeDavid K. PhamAuthor Vitae,Lutz Mä dlerAuthor VitaeNicolae BarsanAuthor Vitae,Udo WeimarAuthor Vitae |
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| Affiliation: | a Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
b IWT Foundation Institute of Materials Science, Department of Production Engineering, University of Bremen, Badgasteiner Str. 3, 28359 Bremen, Germany |
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| Abstract: | Via flame spray pyrolysis (FSP), SnO2 gas sensing layers have been doped with 0.01-4 wt% Sb as well as 0.01 wt% Pd in combination with 1 wt% Sb. Characterization of these materials through X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analysis, and transmission electron microscopy (TEM) revealed particle grain sizes and crystallinity unchanged by the presence of Sb and/or Pd. The addition of Sb to SnO2 resulted in the significant decrease in baseline resistance; up to two orders of magnitude in dry air at 300 °C and three orders of magnitude in humid air at 300 °C, which is significant for FSP-prepared gas sensors with high porosity and low particle coordination number since they typically suffer from high baseline resistance. While the baseline resistance was improved with Sb-doping, the sensor signal (R0/Rgas) remained constant over all concentrations explored. Moreover, regarding the surface functionalization of SnO2 with Pd in combination with Sb-doping, the reduction of baseline resistance was preserved without influencing sensor signal. |
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| Keywords: | Sb doping Gas sensor FSP SnO2 |
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