Effect of Charge Transfer in Magnetic-Plasmonic Au@MOx (M = Mn, Fe) Heterodimers on the Kinetics of Nanocrystal Formation

Isabel Schick, Dominik Gehrig, Mirko Montigny, Benjamin Balke, Martin Panthöfer, Andreas Henkel, Frédéric Laquai, Wolfgang Tremel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


Heteronanoparticles represent a new class of nanomaterials exhibiting multifunctional and collective properties, which could find applications in medical imaging and therapy, catalysis, photovoltaics, and electronics. This present work demonstrates the intrinsic heteroepitaxial linkage in heterodimer nanoparticles to enable interaction of the individual components across their interface. It revealed distinct differences between Au@MnO and Au@Fe3O4 regarding the synthetic procedure and growth kinetics, as well as the properties to be altered by the variation of the electronic structure of the metal oxides. The chemically related metal oxides differ concerning their band gap; while MnO is a Mott-Hubbard insulator with a large band gap, Fe3O4 is a semimetal with thermally activated conductivity. The fluorescence dynamics indicate a prolonged relaxation time (>2 ns) for electrons of the conduction band of the Au nanoparticles after interfacing to Fe3O4. Here, the semiconductor is not depleted and forms an ohmic contact to the Au domain. In contrast, the fluorescence dynamics and ESCA of Au@MnO affirmed the weak interaction with the electrons of the Au domain, where the junction behaves as a Schottky barrier.

Original languageEnglish (US)
Pages (from-to)4877-4884
Number of pages8
JournalChemistry of Materials
Issue number13
StatePublished - Jul 14 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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