Shape-dependent compressibility of TiO2 anatase nanoparticles

Seung Won Park, Jung Tak Jang, Jinwoo Cheon, Hyun Hwi Lee, Dong Ryeol Lee, Yongjae Lee

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

We measured the size- and shape-dependent compressibility of the TiO 2 anatase nanoparticles using monochromatic synchrotron X-ray powder diffraction and high-pressure diamond-anvil cell techniques. Compared to the bulk anatase sample, the rice-shaped (3.8 × 5.0 nm) and the rod-shaped (3.5 × 21.0 nm) anatase nanoparticles exhibit reduced and enhanced bulk modulus, respectively, ranging between 204(8) and 319(20) GPa. The Williamson-Hall plot analysis of the measured diffraction data from the bulk sample shows that the pressure-dependent increase of the microscopic strain is isotropic, whereas the Strokes-Wilson profile analyses on the two resolved Bragg peaks from the anatase nanoparticles reveal anisotropic distribution and evolution of the relative strain. This might be attributed to the higher c-axial compressibility and also to the higher population contrast of the hard TiO 6 and soft O6 octahedra in the nanoparticle samples compared to the bulk sample.

Original languageEnglish
Pages (from-to)9627-9631
Number of pages5
JournalJournal of Physical Chemistry C
Volume112
Issue number26
DOIs
Publication statusPublished - 2008 Jul 3

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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