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CARBONLETT, vol. 26, no. 1, pp.81-87, 2018

DOI: http://dx.doi.org/10.5714/CL.2018.26.081

Comparative study on the morphological properties of graphene nanoplatelets prepared by an oxidative and non-oxidative route

Jung-Chul An1, Eun Jung Lee1, So-Young Yoon1, Seong-Young Lee2 and Yong-Jung Kim1,♠

Affiliation: 1Energy Materials Research Group, Research Institute of Industrial Science & Technology (RIST), Pohang 37673, Korea
2Materials Solution Research Group, Research Institute of Industrial Science & Technology (RIST), Pohang 37673, Korea

Abstract: Morphological differences in multi-layered graphene flakes or graphene nanoplatelets pre¬pared by oxidative (rGO-NP, reduced graphene oxide-nanoplatelets) and non-oxidative (GIC-NP, graphite intercalation compound-nanoplatelets) routes were investigated with var¬ious analytical methods. Both types of NPs have similar specific surface areas but very dif¬ferent structural differences. Therefore, this study proposes an effective and simple method to identify structural differences in graphene-like allotropes. The adsorptive potential peaks of rGO-NP attained by the density functional theory method were found to be more scat-tered over the basal and non-basal regions than those of GIC-NP. Raman spectra and high resolution TEM images showed more distinctive crystallographic defects in the rGO-NP than in the GIC-NP. Because the R-ratio values of the edge and basal plane of the sample were maintained and relatively similar in the rGO-NP (0.944 for edge & 1.026 for basal), the discrepancy between those values in the GIC-NP were found to be much greater (0.918 for edge & 0.164 for basal). The electrical conductivity results showed a remarkable gap between the rGO-NP and GIC-NP attributed to their inherent morphological and crystal¬lographic properties.

Keyword: graphene nanoplatelets, reduced graphene oxide, graphite intercalation com¬pound, adsorptive potential, density functional theory method