Influence of Ti4+ on the Energetics and Microstructure of SnO2 Nanoparticles

Joice Miagava, Douglas Gouvêa, Ricardo H.R. Castro, Alexandra Navrotsky

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The effect of an additive in the microstructure of an oxide can be related to changes of both kinetic and thermodynamic parameters. However, Ti and Sn ions have the same charge (4+), similar ionic radii and both TiO2 and SnO2 crystallize in the tetragonal rutile structure, and thus changes in the kinetics parameters are not expected to occur. Nanocrystalline Sn1-xTixO2 rutile-structured solid solutions have shown promise as gas sensors and photocatalysts. A fuller understanding of their microstructure and thermodynamics is necessary to improve the performance of the device. In this work, Sn1-xTixO2 (0.00 ≤ x ≤ 0.50) rutile-structured nanoparticles were synthesized by Pechini method at 500 °C for 15 h. Upon increasing the Ti4+ content, both crystallite size determined by XRD and particle size determined by N2 adsorption decrease. However, it is suggested that the surface of the nanocrystalline Sn1-xTixO2 has a similar structure to TiO2 anatase, which has a lower surface energy compared to both SnO2 and TiO2 rutile.

Original languageEnglish (US)
Title of host publicationAdvanced Processing and Manufacturing Technologies for Nanostructured and Multifunctional Materials
PublisherWiley
Pages145-152
Number of pages8
ISBN (Electronic)9781119040354
ISBN (Print)9781119040262
DOIs
StatePublished - Feb 10 2015
Externally publishedYes

Keywords

  • Gas sensor
  • Microstructure
  • Nanoparticle
  • Pechini method
  • Photocatalyst

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

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