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SEM images at 500× magnification of unmodified Whatman grade No. 3 filter paper (a) And filter paper modified with: (b) Graphene ink, (c) Graphene/PEDOT:PSS. SEM images at 10,000× magnification of the filter paper modified with: (d) Graphene ink, (e) Graphene/PEDOT:PSS, and (f) Graphene/PEDOT:PSS with methanol treatment.
