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Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons
Elena F Sheka1, Yevgeny A Golubev2, Nadezhda A Popova1
1Institute of Physical Researches and Technologies, Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya 6, 117198 Moscow, Russia.
Raman spectroscopy reveals how graphene domain size and structure influence sp2 amorphous carbon spectra. Electrical anharmonicity and electron delocalization are key factors in two-phonon spectra formation.
Area of Science:
- Materials Science
- Spectroscopy
- Condensed Matter Physics
Background:
- The D-G-2D Raman spectra pattern is characteristic of sp2 amorphous carbons.
- Understanding these spectra provides insights into the structure of graphene domains.
Purpose of the Study:
- To analyze the D-G-2D Raman spectra of sp2 amorphous carbons using molecular spectroscopy.
- To connect spectral features to graphene domain characteristics like size, heteroatom content, and packing.
Main Methods:
- Application of molecular spectroscopy to interpret one-phonon (D-G) and two-phonon (2D) Raman spectra.
- Experimental observation of a size-stimulated transition from molecular to quasi-particle phonon descriptions.
- Analysis of C=C bond length dispersion and electrical anharmonicity.
Main Results:
- The D-G doublet is linked to C=C bond length variations within graphene domains.
- Electrical anharmonicity and electron delocalization significantly influence two-phonon spectra.
- The study experimentally traced a transition in Raman spectra interpretation based on domain size.
Conclusions:
- Graphene domain size, composition, and packing dictate Raman spectral features.
- Electron delocalization in graphene domains is crucial for understanding two-phonon spectra.
- The research provides a method to evaluate the free path of optical phonons in graphene.
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