Comparative study on the morphological properties of graphene nanoplatelets prepared by an oxidative and non-oxidative route
관리자2018-05-03조회 2223
Morphological differences in multi-layered graphene flakes or graphene nanoplatelets prepared
by oxidative (rGO-NP, reduced graphene oxide-nanoplatelets) and non-oxidative
(GIC-NP, graphite intercalation compound-nanoplatelets) routes were investigated with various
analytical methods. Both types of NPs have similar specific surface areas but very different
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 scattered
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 crystallographic
properties.
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