title: Electronically coupled hybrid structures by graphene oxide directed self-assembly of Cu(2-x)S nanocrystals.
abstract: Here, we describe an electronically coupled hybrid material consisting of graphene oxide (GO) flakes and inorganic Cu(2-x)S nanocrystals (NCs) formed via a self-assembly route. As a result of the amphiphilic nature of the water-dispersible GO flakes, the hydrophobic Cu(2-x)S NCs self-assemble in between the GO flakes, resulting in a large-interface hybrid structure with ordered close-packed NCs. We demonstrate that the optical properties of the hybrid GO/Cu(2-x)S structures are governed by the injection of electrons from the GO flakes to the valence band of the vacancy-doped plasmonic Cu(2-x)S NCs. This leads to a suppression of the plasmon band of the Cu(2-x)S NCs and to a softening of the Raman G-band of the GO flakes. Our results indicate that graphene derivatives can act not only as a self-assembly directing template, but also as a tool to affect the optical properties of self-assembled NCs in a chemical process, enhanced by the high interface area of the composite.
authors: Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität München, Munich, Germany. shanya_n@yahoo.com ilka.kriegel@polimi.it jessica.rodriguez@lmu.de.
authors: Shany
authors: S
authors: Neyshtadt
authors: Ilka
authors: I
authors: Kriegel
authors: Jessica
authors: J
authors: Rodríguez-Fernández
authors: Stephan
authors: S
authors: Hug
authors: Bettina
authors: B
authors: Lotsch
authors: Enrico
authors: E
authors: Da Como