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Peptide Cross-linkers: Immobilization of Platinum Nanoparticles Highly Dispersed on Graphene Oxide Nanosheets with Enhanced Photocatalytic Activities
- Tsukasa Mizutaru
, - Galina Marzun ,
- Sebastian Kohsakowski ,
- Stephan Barcikowski,
- Dachao Hong ,
- Hiroaki Kotani ,
- Takahiko Kojima,
- Takahiro Kondo ,
- Junji Nakamura , and
- Yohei Yamamoto
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†Division of Materials Science, §Division of Chemistry, ¶Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), and ∥Center for Integrated Research in Fundamental Science and Technology (CiRfSE), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
‡ Technical Chemistry I, Center for Nanointegration Duisburg-Essen (CENIDE), and NanoEnergieTechnikZentrum (NETZ), University of Duisburg-Essen, 7 Universitätstraße, 45141 Essen, Germany
*E-mail: [email protected]
Abstract
For exerting potential catalytic and photocatalytic activities of metal nanoparticles (MNPs), immobilization of MNPs on a support medium in highly dispersed state is desired. In this Research Article, we demonstrated that surfactant-free platinum nanoparticles (PtNPs) were efficiently immobilized on graphene oxide (GO) nanosheets in a highly dispersed state by utilizing oligopeptide β-sheets as a cross-linker. The fluorenyl-substituted peptides were designed to form β-sheets, where metal-binding thiol groups and protonated and positively charged amino groups are integrated on the opposite sides of the surface of a β-sheet, which efficiently bridge PtNPs and GO nanosheet. In comparison to PtNP/GO composite without the peptide linker, the PtNP/peptide/GO ternary complex exhibited excellent photocatalytic dye degradation activity via electron transfer from GO to PtNP and simultaneous hole transfer from oxidized GO to the dye. Furthermore, the ternary complex showed photoinduced hydrogen evolution upon visible light irradiation using a hole scavenger. This research provides a new methodology for the development of photocatalytic materials by a bottom-up strategy on the basis of self-assembling features of biomolecules.
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