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Fig. 2. (Color online) (a) Cu disc after graphene growth, (b) 3D graphene in etchant after etching Cu completely out with a solution mixture of 1 M FeCl3 and 0.1 M HCl to reveal the 3D
network of graphene or graphite [11].
New Phys.: Sae Mulli 2022;72:8~12 https://doi.org/10.3938/NPSM.72.8
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