Shape-dependent compressibility of TiO2 anatase nanoparticles

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

doi:10.1021/jp801555a

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 journal › Article › peer-review

52 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 language	English
Pages (from-to)	9627-9631
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	26
DOIs	https://doi.org/10.1021/jp801555a
Publication status	Published - 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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title = "Shape-dependent compressibility of TiO2 anatase nanoparticles",

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.",

author = "Park, {Seung Won} and Jang, {Jung Tak} and Jinwoo Cheon and Lee, {Hyun Hwi} and Lee, {Dong Ryeol} and Yongjae Lee",

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AU - Park, Seung Won

AU - Jang, Jung Tak

AU - Cheon, Jinwoo

AU - Lee, Hyun Hwi

AU - Lee, Dong Ryeol

AU - Lee, Yongjae

PY - 2008/7/3

Y1 - 2008/7/3

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