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 proceedingConference contribution

Abstract

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. Surface energies and solid-solid interface energies were calculated by combining water adsorption calorimetry and high temperature oxide melt solution calorimetry. Botìi surface energy and solid-solid interface energy decreases with the addition of Ti4+. It is proposed that the stabilization of the particle and the crystallite size are a consequence of the decrease in the surface and interface energies caused by the Ti4+ surface segregation, which is supported by EELS. Given that the surface energy of pure TiO2 rutile reported in the literature is higher than the surface energy of pure SnO2, one may expect that the segregation of Ti4+ in the surface would increase the surface energy contradicting the results. 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
Subtitle of host publicationCeramic Engineering and Science Proceesings
EditorsTatsuki Ohji, Mrityunjay Singh, Sanjay Mathur
PublisherAmerican Ceramic Society
Pages145-152
Number of pages8
Edition6
ISBN (Electronic)9781119031185, 9781119040200, 9781119040262, 9781119040279, 9781119040286, 9781119040385, 9781119040439
StatePublished - 2014
Externally publishedYes
EventAdvanced Processing and Manufacturing Technologies for Nanostructured and Multifunctional Materials - 38th International Conference on Advanced Ceramics and Composites, ICACC 2014 - Daytona Beach, United States
Duration: Jan 26 2014Jan 31 2014

Publication series

NameCeramic Engineering and Science Proceedings
Number6
Volume35
ISSN (Print)0196-6219

Conference

ConferenceAdvanced Processing and Manufacturing Technologies for Nanostructured and Multifunctional Materials - 38th International Conference on Advanced Ceramics and Composites, ICACC 2014
Country/TerritoryUnited States
CityDaytona Beach
Period1/26/141/31/14

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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