Nanodiamond size from low-frequency acoustic Raman modes

0561900 - FZÚ 2023 RIV US eng J - Journal Article
Vlk, Aleš - Ledinský, Martin - Shiryaev, A. - Ekimov, E. - Stehlík, Štěpán
Nanodiamond size from low-frequency acoustic Raman modes.
Journal of Physical Chemistry C. Roč. 126, č. 14 (2022), s. 6318-6324. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA MŠMT EF16_026/0008382; GA MŠMT LM2018110
Grant - others:Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382
Institutional support: RVO:68378271
Keywords : HPHT nanodiamonds * Raman spectroscopy * acoustic modes * phonon confinement * particle size
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1021/acs.jpcc.2c00446

Bottom-up high-pressure, high-temperature (BU_HPHT) synthesis of nanodiamonds (NDs) from organic precursors has recently enabled unprecedented control over the ND size down to the phonon confinement region (≤3 nm) of a diamond. This allows us to perform a comprehensive multiwavelength Raman spectroscopy analysis of the Raman spectra and size-related effects in BU_HPHT NDs in the size range from 1.2 to 8 nm. We present and discuss difficulties in ND size determination using the diamond 1332 cm–1 Raman line position. In contrast, we demonstrate the utilization of the low-frequency acoustic Raman modes for this purpose, namely, for quantum-sized sub-3 nm NDs. Using Lamb’s model for these low-frequency acoustic modes, we calculate the ND size and find a remarkable agreement with the size values obtained by the XRD and HRTEM.
Permanent Link: https://hdl.handle.net/11104/0334326