1 research outputs found
Effect of Charge Transfer in Magnetic-Plasmonic Au@MO<sub><i>x</i></sub> (M = Mn, Fe) Heterodimers on the Kinetics of Nanocrystal Formation
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@Fe<sub>3</sub>O<sub>4</sub> 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, Fe<sub>3</sub>O<sub>4</sub> 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 Fe<sub>3</sub>O<sub>4</sub>. 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