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Keywords:

  • charge-transfer complexes;
  • graphene oxide;
  • ion exchange;
  • nonlinear optics;
  • sensors
Thumbnail image of graphical abstract

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.