Resonant Raman scattering of anthracene‐based carbons in the secondary carbonization stage. (30th November 2020)

• Record Type: Journal Article
• Authors: Maslova, Olga Aleksandrovna; Ammar, Mohamed‐Ramzi; Fantini, Cristiano; Barannikova, Svetlana Aleksandrovna; Pimenta, Marcos Assunção
• Is Part Of: Journal of Raman spectroscopy. Volume 52:Number 3(2021)
• Page Start: 670
• Page End: 677
• Publication Date: 2020-11-30
• Subjects: anthracene‐based coke -- D‐band -- double resonance process -- graphitizable carbon -- secondary carbonization; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.6051
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract: The Raman spectra of graphene‐based matter exhibit a set of defect/disorder‐induced bands. The D band, which exhibits a strong dispersion up to ~50 cm −1 /eV, comes from transverse optical phonons around K or K′ in the first Brillouin zone and involves an intervalley double resonance (DR) Raman process. In the present work, resonant Raman scattering (lines ranging from 1.58 to 3.81 eV) is used to study the unusual behavior of the one‐phonon Raman band of a carbonaceous material (anthracene‐based carbon which is one of the graphitizable carbons) upon its secondary carbonization stage (450°C–1000°C). While the G band appears to be nondispersive, the D band exhibits a change in both position and intensity. Its dispersion progressively rises from ~6 cm −1 /eV to values close to what is usually observed in defected graphene‐based systems when anthracene‐based carbon becomes almost pure. This evolution appears to be correlated with a release of hydrogen (fixed on the edges of polyaromatic layers) questioning their role in changing the D band resonance conditions. Abstract : Resonant Raman scattering (from 1.58 to 3.81 eV) is used to study the one‐phonon Raman bands of graphitizable anthracene‐based carbon upon its secondary carbonization stage (450°C–1000°C). While the G band appears to be nondispersive, the D band position progressively rises from ∼6 cm –1 /eV to values close to those of graphene‐based systems. This evolution appears to be correlated with a release of hydrogen (fixed on the edges of polyaromatic layers) questioning their role in changing the D band resonance conditions.