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(a) Schematic drawing of PEG-NGO; (b) IL-RGO; (c) Graphene-PCTA-Au-IL; (d) TiO2-graphene hydrids nanostructures. Reproduced from [43] (a), with permission from American Chemical Society, 2008; Reproduced from [44] (b), with permission from The Royal Society of Chemistry, 2009; Reproduced from [45] (c), with permission from The Royal Society of Chemistry, 2009; Reproduced from [46] (d), with permission from American Chemical Society, 2009.
