cm9b03342_si_001.pdf (1.46 MB)
Longitudinal Strain Engineering of Cu2–xS by the Juxtaposed Cu5FeS4 Phase in the Cu5FeS4/Cu2–xS/Cu5FeS4 Nanosandwich
journal contribution
posted on 2019-10-17, 18:46 authored by Jongsik Park, Sunghyun Lim, Taehyun Kwon, Minki Jun, Aram Oh, Hionsuck Baik, Kwangyeol LeeStructurally
well-defined heteronanoparticles have received great
attention because their distinct structural features can be altered
to achieve unprecedented properties. The cation exchange reaction,
one of the most powerful techniques to synthesize heteronanoparticles,
can tune the regiospecific composition of nanoparticles while maintaining
the overall morphology of the template. Herein, we demonstrate that
the nascent interface between the cation-exchanged region and the
unchanged template can induce a significant tensile or compressive
strain on the lattice of the template so that the cation exchange
process at the interface can be greatly facilitated. The fate of the
overall cation exchange reaction can be dictated by placing the initial
cation exchange sites on the template regioselectively. Via a careful
kinetic and thermodynamic control of the cation exchange, we could
prepare two completely different nanostructures of Cu5FeS4/Cu2–xS/Cu5FeS4 nanosandwich and Cu5FeS4/Cu2–xS Janus nanoparticle. The synthetic concept described
in this study could be further extended to the synthesis of various
rationally designed multiphasic nanoparticles with exciting physicochemical
properties.