• 文献标题:   Electronically coupled hybrid structures by graphene oxide directed self-assembly of Cu2-xS nanocrystals
  • 文献类型:   Article
  • 作  者:   NEYSHTADT S, KRIEGEL I, RODRIGUEZFERNANDEZ J, HUG S, LOTSCH B, DA COMO E
  • 作者关键词:  
  • 出版物名称:   NANOSCALE
  • ISSN:   2040-3364 EI 2040-3372
  • 通讯作者地址:   Univ Munich
  • 被引频次:   7
  • DOI:   10.1039/c5nr00656b
  • 出版年:   2015

▎ 摘  要

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.