期刊
SURFACE SCIENCE
卷 604, 期 15-16, 页码 1326-1330出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2010.04.022
关键词
Surface vibrations; Overtones; Optical phonon; Quantum size effect; Electron scattering
资金
- Israeli Academy of Science and Arts
- Technion Fund for Promotion of Research
- Australian Research Council
Nano-diamond films composed of 3-5 nm grains prepared by the detonation method and spray deposited onto silicon substrates were examined by high resolution electron energy loss spectroscopy (HR-EELS). Raman spectroscopy and transmission electron microscopy. The HR-EEL spectrum of the annealed and hydrogenated films displays dominant C-H losses at 360-365 meV; the diamond optical phonon and its overtones. These results suggest that the films reveal well defined hydrogenated diamond surfaces on the nanometric scale. Detailed analysis of the diamond optical phonon overtone revealed a red-shift of the basic C C vibration by 5 meV. We attribute this shift to a phonon quantum confinement effect detected by HR-EELS spectroscopy. (C) 2010 Elsevier B.V. All rights reserved.
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