Spatially confined corner defects induce chemical functionality of TiO 2 nanorods

Bryan M. Rabatte, Nada M. Dimitrijevic, Russell E. Cook, Zoran V. Saponjic, Tijana Rajh

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

An atomic-resolution transmission electron microscopy (TEM) analysis of surface defect sites present at the tips of high-aspect-ratio ellipsoid nanoparticles of anatase titanium dioxide (TiO2), was investigated. Modification of the nanorod tip surfaces with the enediol dopamine resulted in relaxation of the tip defect sites to their bulk-like octahedral symmetry. It was found that the convergence angle at the tip is specific to the aspect ratio of the rods whereby the tips of such particles converge at a more acute angle that have a pointed appearance. The chemical reactivity of the corner-defect-containing anisotropic rods is highly dependent on the presence of the under-coordinated titanium atoms. The results were identical to those obtained nanorods solely modified with dopamine and there was no extension or displacement of of the crystalline lattice after surface modification.

Original languageEnglish (US)
Pages (from-to)1033-1037
Number of pages5
JournalAdvanced Materials
Volume18
Issue number8
DOIs
StatePublished - Apr 18 2006
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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