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(b)
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Figure 2: (a) SEM image of a GNP agglomerate; (b) higher magnification SEM image revealing submicron GNP particles; (c) TEM image of a single GNP, indicating a single GNP particle consists of stacks of graphene layers; and (d) SEM image of the GNP-PTFE film in which GNP particles were held together by PTFE (indicated by arrows).