Evaluation of ultrananocrystalline diamond size by UV Raman spectroscopy and a phonon confinement model
This study applied ultraviolet (UV) Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) to investigate phonon modes and chemical bonding in ultrananocrystalline diamond films. XPS analysis revealed distinct carbon hybridization states, with the ultrananocrystalline diamond film exhibiting dominant sp<sup>3</sup> bonding and the diamond nanowire film showing reduced sp<sup>3</sup> content alongside sp<sup>2</sup> hybridization. The sp<sup>3</sup>-bonded T<sub>2g</sub> phonon mode, selectively probed by UV Raman spectroscopy <i>via</i> near-resonance enhancement, demonstrated crystallite sizes of 5.6 nm for ultrananocrystalline diamond and 2.1 nm for nanowires through characteristic phonon confinement effects. The measured dimensions showed quantitative agreement with theoretical confinement models, confirming phonon localization within nanodiamond domains. The combined results demonstrated that nanoscale carbon hybridization governs the material properties, with the XPS-derived sp<sup>3</sup>/sp<sup>2</sup> ratios directly correlating with the Raman-measured phonon confinement effects.
Authors
- В. А. Володин (ORCID: https://orcid.org/0000-0002-1431-8242)
- Kalpataru Panda
- A. T. Kozakov (ORCID: https://orcid.org/0000-0003-1081-3817)
- S. V. Goryaĭnov (ORCID: https://orcid.org/0000-0003-0083-8631)
- N. Kumar (ORCID: https://orcid.org/0009-0008-7297-5313)
- А. В. Никольский
Institutions
- Southern Federal University (RU)
- Manipal Academy of Higher Education (IN)
- Novosibirsk State University (RU)
- National Research Tomsk State University (RU)
- V.S. Sobolev Institute of Geology and Mineralogy (RU)
- Institute of Semiconductor Physics (RU)
Publication Details
- Journal
- Physical Chemistry Chemical Physics
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5cp02967h
- Primary Topic
- Diamond and Carbon-based Materials Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00