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UV-vis spectra of graphene oxide solutions after covalent coupling (2 h reaction at room temperature) with Cy3-labeled streptavidin. After the coupling, the graphene oxide sheets were filtered and washed with 1× PBS solution to remove unbound molecules. A (red solid line): as-prepared graphene oxide in combination with Pluronic F127 coating. B (blue dashed line): doubly oxidized graphene oxide. C (black dash-dot line): as-prepared graphene oxide.
