Journal
NANOSCALE RESEARCH LETTERS
Volume 12, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1186/s11671-017-2333-0
Keywords
Nanodiamond; Raman Spectroscopy; High Pressure
Funding
- Ministry of Education and Science of the Russian Federation [RFMEFI59317X0007, 14.593.21.0007]
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Nanodiamond in a 2-5-nm size interval (which is typical for an appearance of quantum confinement effect) show Raman spectra composed of 3 bands at 1325, 1600, and 1500 cm(-1) (at the 458-nm laser excitation) which shifts to 1630 cm(-1) at the 257-nm laser excitation. Contrary to sp(2)-bonded carbon, relative intensities of the bands do not depend on the 458- and 257-nm excitation wavelengths, and a halfwidth and the intensity of the 1600 cm(-1) band does not change visibly under pressure at least up to 50 GPa. Bulk modulus of the 2-5-nm nanodiamond determined from the high-pressure study is around 560 GPa. Studied 2-5-nm nanodiamond was purified from contamination layers and dispersed in Si or NaCl.
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