Directional heat dissipation across the interface in anatase-rutile nanocomposites

Ting Xia, Neng Li, Yuliang Zhang, Michael B. Kruger, James Murowchick, Annabella Selloni, Xiaobo Chen

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

Understanding the structures and properties of interfaces in (nano-)composites helps to reveal their important influence on reactivity and overall performance. TiO2 is a technologically important material, and anatase/rutile TiO2 composites have been shown to display enhanced photocatalytic performance over pure anatase or rutile TiO2. This has been attributed to a synergistic effect between the two phases, but the origin of this effect as well as the structure of the interface has not been established. Using Raman spectroscopy, here we provide evidence of distinct differences in the thermal properties of the anatase and rutile moieties in the composite, with anatase becoming effectively much warmer than the rutile phase under laser irradiation. With the help of first-principles calculations, we analyze the atomic structure and unique electronic properties of the composite and infer possible reasons for the directional heat dissipation across the interface.

Original languageEnglish (US)
Pages (from-to)9883-9890
Number of pages8
JournalACS Applied Materials and Interfaces
Volume5
Issue number20
DOIs
StatePublished - Nov 6 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • Raman spectroscopy
  • anatase/rutile nanocomposite interface
  • density functional theory
  • electronic structure
  • lattice vibrations

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