Full width at half maximum intensity of the G band in the first order Raman spectrum of carbon material as a parameter for graphitization

Dispersion and diameter separation of multi-wall carbon nanotubes in aqueous solutions

“…Jiang et al reported on stable CNTs dispersion (500 mg/l) prepared in 20 mg/l SDS solution [43]. Contrary to these works, a recent paper discussed how the SDS concentration influences the amounts of CNTs that can be effectively dispersed in water [32]. It was shown that 1 wt.% (ca.…”

“…The D band is attributed to the presence of defects (sp 3 carbons, vacancies, foreign atoms, etc.). The intensity ratio between the G and D bands ratio is a commonly accepted indicator of sample crystallinity [32]. The G/D ratio in nitric acid treated nanotubes is almost 10% lower in comparison with the pristine sample.…”

Highly loaded carbon black supported Pt catalysts for fuel cells

“…Correlation between I G /I D and graphitic particle size [11] shows that this corresponds to a size of the graphitic crystallites, D(G,Raman), of about 5 nm. Because full width at half maximum intensity of the G band was larger than 20 cm −1 for all supports, the degree of graphitization was low and the graphite crystallites have highly turbostratic character [20].…”

Study on the evolution of the char structure during hydrogasification process using Raman spectroscopy

“…Among these three techniques, Raman spectroscopy is a very powerful and promising method for evaluating the structural features of highly disordered carbon materials [18] because of high sensitivity to crystalline, molecular and amorphous structures of carbonaceous materials [19] and the minimal influence of minerals [14,20,21]. Raman spectral parameters, such as peak position, full width at half maximum (FWHM) of band and band area ratios, have been used to characterize carbon structure [17,[22][23][24]. These Raman parameters have good correlations with the gasification reactivity [12,13,25] and char combustion reactivity [18].…”