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Strategies to improve the electrical conductivity of nanoparticle-based antimony-doped tin oxide aerogels

Authors
  • Rechberger, Felix1
  • Städler, Roman1
  • Tervoort, Elena1
  • Niederberger, Markus1
  • 1 ETH Zurich, Laboratory for Multifunctional Materials, Department of Materials, Vladimir-Prelog-Weg 5, Zurich, 8093, Switzerland , Zurich (Switzerland)
Type
Published Article
Journal
Journal of Sol-Gel Science and Technology
Publisher
Springer US
Publication Date
Jul 21, 2016
Volume
80
Issue
3
Pages
660–666
Identifiers
DOI: 10.1007/s10971-016-4156-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractWe present different strategies to improve the electrical conductivity of antimony-doped tin oxide aerogels assembled from preformed nanosized building blocks. By adjusting the annealing atmosphere and temperature conditions, additional UV treatment to remove surface organics prior to annealing and by tuning the antimony content of the nanoparticles, different strategies are employed to influence the properties of the supercritically dried aerogels before and after gelation. In the framework of this study, also the formation of pure SnO2 particle-based aerogels could be achieved. Furthermore, we present an experimental setup for analyzing the electrical conductivity of porous and fragile aerogel monoliths based on a four-point probe. While the annealing atmosphere does not significantly affect the resistivity, UV treatment leads to a resistivity decrease in around 50 %. It is found that the resistivity of the samples can be tuned by altering the antimony content, offering very low-resistivity levels down to 4.5 Ω cm, while the surface areas remained high without significant crystal growth for the doped samples.Graphical Abstract

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