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Issue 15, 2015
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Electronically coupled hybrid structures by graphene oxide directed self-assembly of Cu2−xS nanocrystals

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Abstract

Here, we describe an electronically coupled hybrid material consisting of graphene oxide (GO) flakes and inorganic Cu2−xS nanocrystals (NCs) formed via a self-assembly route. As a result of the amphiphilic nature of the water-dispersible GO flakes, the hydrophobic Cu2−xS 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/Cu2−xS structures are governed by the injection of electrons from the GO flakes to the valence band of the vacancy-doped plasmonic Cu2−xS NCs. This leads to a suppression of the plasmon band of the Cu2−xS 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.

Graphical abstract: Electronically coupled hybrid structures by graphene oxide directed self-assembly of Cu2−xS nanocrystals

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Publication details

The article was received on 28 Jan 2015, accepted on 03 Mar 2015 and first published on 06 Mar 2015


Article type: Paper
DOI: 10.1039/C5NR00656B
Citation: Nanoscale, 2015,7, 6675-6682
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    Electronically coupled hybrid structures by graphene oxide directed self-assembly of Cu2−xS nanocrystals

    S. Neyshtadt, I. Kriegel, J. Rodríguez-Fernández, S. Hug, B. Lotsch and E. Da Como, Nanoscale, 2015, 7, 6675
    DOI: 10.1039/C5NR00656B

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