obtained was 27%. Also some researchers exploited graphene sheet
as a candidate to improve the thermal conductivity of polymer
material. Raquel Verdejo et al. [37] filled 0.25 wt% functionalized
graphene sheet in silicone foam, which enhanced the thermal
conductivity of nanocomposite up to 8% than the original silicone
foam. Khan M. F. Shahil et al. [38] mixed ~10 vol% graphenemultilayer
graphene with epoxy revealed a record-high enhancement
of thermal conductivity by 2300% than pristine epoxy. Xingyi
Huang et al. [39] chose 50 vol% CNTs or 50 vol% graphene nanoplatelets
to increase the epoxy resin thermal conductivity up to
7.30 W m1 K1 by synergetic effects.
In the present work, we report a re-expansion and exfoliation
method to obtain mass few-layer graphene sheets using the
commercially available graphite intercalation compounds (GIC) as
starting material. Then the graphene-epoxy resin thermal
conductive adhesive by filling the graphene sheets was fabricated
by above mentioned method, subsequently we investigate the
thermal conductivity of this kind of thermal adhesive with different
weight filling loads. In addition, we chose natural graphite powder
and graphite nanoflake as reference fillers with the same epoxy
resin, and the thermal conductivities of all samples were characterized
on Hot Disk TPS-2500 thermal constants analyzer.