Shape-dependent compressibility of TiO2 anatase nanoparticles
- Authors
- Park, SW; Jang, JT; Cheon, J; Lee, HH; Lee, DR; Lee, Y
- Issue Date
- Jul-2008
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, v.112, pp.9627 - 9631
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- Volume
- 112
- Start Page
- 9627
- End Page
- 9631
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/6086
- DOI
- 10.1021/jp801555a
- ISSN
- 1932-7447
- Abstract
- We measured the size- and shape-dependent compressibility of the TiO2 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 x 5.0 nm) and the rod-shaped (3.5 x 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 TiO6 and Soft O-6 octahedra in the nanoparticle samples compared to the bulk sample.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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