Probing the nature of defects of graphene like nano-carbon from amorphous materials by raman spectroscopy
Carbon; Defect band; Graphene layers; Graphitic band
Raman spectral characterization of selected carbonaceous materials has been carried out at excitation wavelengths 514, 633 and 1064 nm. Raman studies exhibit the presence of G band owing to the first order of E2g mode scattering. sp3 domains at about 1355 cm-1 (D band) are ascribed to the disordered structures due to the on-site and hoping defects which introduces distortions in the crystal lattice. Spectral de-convolution indicates the prominence of bands namely G, D1, D2, D3 and D4. D3 and D4 bands follow Gaussian, while the others Lorentian distribution. With change in excitation wavelength of laser, the degree of dispersion of G peak and ID/IG intensity ratio are found to increase. The crystallite size La, shows an inverse relation with intensity of defect to graphite band (ID/IG) and it also obeys Tuinstra-Koenig relation for nano-crystalline substance. The lateral size of aromatic lamellae determined using XRD analysis is in good agreement with that of Raman analysis. The feasibility of using kerosene soot, diesel soot and carbon black for electrochemical applications are also explored.
Asian Journal of Chemistry, Vol-28, No. 7, pp. 1501-1504.
All Open Access; Hybrid Gold Open Access
https://doi.org/10.14233/ajchem.2016.19739 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964661533&doi=10.14233%2fajchem.2016.19739&partnerID=40&md5=8ac4e30ac946a4b3ba6cd3cd38379236
Mohan A.N., Department of Physics, Christ University, Bangalore, 560 029, India, Department of Physics, Jain University, Bangalore, 560 001, India; Manoj B., Department of Physics, Christ University, Bangalore, 560 029, India; Ramya A.V., Department of Physics, Christ University, Bangalore, 560 029, India