A Graphene Oxide–Organic Dye Ionic Complex with DNA-Sensing and Optical-Limiting Properties


  • This work is supported by NRF-CRP grant “Graphene Related Materials and Devices”. (R-143-00-360-281).


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A charge-transfer complex between graphene oxide (GO) and pyrene dye PNPB has been synthesized by a simple ion-exchange process. Its highly specific interactions with DNA compared to other biomolecules (see scheme) allows selective and rapid detection of DNA in biological mixtures. It also exhibits broadband optical limiting.