Journal article
Phonon confinement effects in the Raman spectrum of nanodiamond
Physical review. B, v 80(7)
01 Aug 2009
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Nanodiamonds (ND) exhibit unique properties due to their small size and high surface-to-volume ratio compared to bulk diamonds. A reduction in crystal size also affects ND Raman spectra. The confinement of optical phonons in nanocrystals (<10 nm) results in asymmetrically broadened Raman lines, which are shifted toward lower wavenumbers. The phonon confinement model (PCM) relates the observed changes in the Raman spectra to the crystal size and can be used for size characterization at the nanoscale. While the PCM was successfully applied to a variety of materials including Si and BN, results remained unsatisfactory in the case of ND. In order to improve the agreement between the predictions of the model and experimental Raman spectra of ND, effects such as crystal size distribution, lattice defects, and the energy dispersion of the phonon modes were taken into consideration and incorporated into the PCM. This work has shown that phonon wave vectors from small vibrational domains lead to a broad shoulder peak at similar to 1250 cm(-1), that is often observed in the Raman spectrum of ND.
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Details
- Title
- Phonon confinement effects in the Raman spectrum of nanodiamond
- Creators
- S. Osswald - Drexel UniversityV. N. Mochalin - Drexel UniversityM. Havel - Drexel UniversityG. Yushin - Georgia Institute of TechnologyY. Gogotsi - Drexel University
- Publication Details
- Physical review. B, v 80(7)
- Publisher
- Amer Physical Soc
- Number of pages
- 9
- Grant note
- Pennsylvania Nanotechnology Institute (NTI) through Ben Franklin Technology Partners of Southeastern Pennsylvania
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000269638900091
- Scopus ID
- 2-s2.0-70349157266
- Other Identifier
- 991019167430204721
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InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter