Graphitization of coal by bio-solubilization: Structure probe by Raman spectroscopy

Title

Graphitization of coal by bio-solubilization: Structure probe by Raman spectroscopy

Creator

Elcey C.D.; Manoj B.

Description

Raman spectra of two coal samples of different rank have been examined with Raman spectrometer operating at an excitation wavelength of 514.5 nm. Raman studies manifested the presence of G band conforming the first order scattering of E2g mode. The sp3 domains at about 1355 cm-1 (D band) is an evidence to edge planes and disordered structures. Analysis by curve fitting the first order spectrum justified the presence of G, D1, D2, D3 and D4 bands. The integrated intensity ratio IG/ID? is found to be 3.66 and 5.8 while the ID/ID? ratio is estimated to be about 3 and 4.9 for bituminous and sub-bituminous coal, respectively indicating on-site and hopping defect in the graphene layers. The 2D band is fitted with multiple Lorentian profile has 4 peaks, the intense G?, G?, D + D? and 2D? band at 2445, 2690, 2925 and 3160 cm-1. From the second order spectrum, formation of about 6-8 stacked graphene layers is observed in sub-bitumionus coal.

Source

Asian Journal of Chemistry, Vol-28, No. 7, pp. 1557-1560.

Date

2016-01-01

Publisher

Chemical Publishing Co.

Subject

Amorphous carbon; Deconvolution; Defect; Raman spectroscopy

Coverage

Elcey C.D., Department of Life Sciences, Kristu Jayanti College, Bangalore, 560 077, India; Manoj B., Department of Physics, Christ University, Bangalore, 560 029, India

Rights

All Open Access; Hybrid Gold Open Access

Relation

ISSN: 9707077; CODEN: AJCHE

Format

Online

Language

English

Type

Article

Identifier

https://doi.org/10.14233/ajchem.2016.19750

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