Fe2O3 nanoparticle structures investigated by X-ray absorption near-edge structure, surface modifications, and model calculations

Lin X. Chen*, Tao Liu, Marion C. Thurnauer, Roseann Csencsits, Tijana Rajh

*Corresponding author for this work

Research output: Contribution to journalArticle

226 Scopus citations

Abstract

The structures of Fe2O3 nanoparticles with different sizes were investigated using Fe K-edge X-ray absorption near-edge structure (XANES) and the FEFF calculations, as well as surface modification with enediol ligands. The studies not only revealed the existence of under-coordinated Fe sites in the nanoparticles but also confirmed that these under-coordinated sites were located on the surface. Upon binding of enediol ligands, surface sites were restructured to octahedral sites. In particular, the nature of the surface defects and their correlation with the unique properties of the nanoparticles were discussed. Model calculations were conducted for FemOn (m ≥ 1, n ≥ 4) clusters of various sizes centered at Fe sites with octahedral (Oh), distorted octahedral (C3v) and tetrahedral (Td) coordination geometry using FEFF8.10 programs. The main features of the calculated spectra agree with the experimental results and were correlated to the density of states, the Fe coordination geometry, and the long-range order of the lattice.

Original languageEnglish (US)
Pages (from-to)8539-8546
Number of pages8
JournalJournal of Physical Chemistry B
Volume106
Issue number34
DOIs
StatePublished - Aug 29 2002

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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