Disorder-induced line broadening in first-order Raman scattering from graphite

Abstract

First-order Raman scattering from graphite irradiated by an electron beam has been studied by using the laser microprobe technique. An approximately linear relation is exhibited between the linewidth of the E, g mode and the reciprocal of the crystallite size. The observed linewidths are larger than those calculated by using the known dispersion curve and the wave-vector uncertainty.

Activity, Performance, and Durability for the Reduction of Oxygen in PEM Fuel Cells, of Fe/N/C Electrocatalysts Obtained from the Pyrolysis of Metal-Organic-Framework and Iron Porphyrin Precursors

“…These are: (i) the full width at half maximum (FWHM) of the D band, which is an indicator of the amount of disorder in the carbon support: the larger it is, the greater is the disorder, and (ii) the ratio of the area of the D band to the area of the G band: the larger is this ratio, the greater is the disorder in the carbon support. Since the graphitization or the crystallinity of the carbon support imply the notion of defect-free and order in this carbon support, the most graphitized or crystalline catalysts will be those with the smallest FWHM of the D band and also those with the smallest ratio for the area of the D band to the area of the G band [37,[49][50][51][52]. Fig.…”

Synthesis and modification of carbon nanomaterials via AC arc and dielectric barrier discharge plasma

“…The D-band is related to structural disorder in the graphene structures and defects on carbon black. The G-band is another important feature which can be assigned to the tangential shear mode corresponding to the crystalline and ordered graphene sheet [50,51]. The relative intensity of the D-band and G-band was calculated as a good index to confirm the degree of graphitization and evaluate the relative purity of samples as shown in Fig.…”

Structural, Electrical, and Thermal Behavior of Graphite‐Polyaniline Composites with Increased Crystallinity

“…[37][38][39][40] Previous studies have shown that in microcrystalline graphite and disordered carbon, new peaks appear at about 1355 (D) and 1620 cm À1 (D') in addition to the E 2g mode observed for large singlecrystals. [38][39][40] These features arise in general from nonzero-center phonons and are related to peaks in the density of states. Moreover, all new first-order peaks have counterparts in the second-order Raman spectrum of graphite.…”