Anisotropic Seeded Growth of Cu–M (M = Au,
Pt, or Pd) Bimetallic Nanorods with Tunable Optical and Catalytic
Properties
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Abstract
A general
strategy to synthesize Cu–M (M = Au, Pt, or Pd)
bimetallic nanorods has been demonstrated based on a seeded co-reduction
method. In this approach, noble metal nanoparticles serve as seeds,
and newly reduced Cu atoms are subsequently nucleated on one side
of the seeds, resulting in Janus nanoparticles with an M-rich and
a Cu-rich portion. The elongation of the particles originates from
the site-specific deposition of Cu clusters on the Cu-rich side of
these Janus nanoparticles by retarding reduction kinetics of Cu through
galvanic replacement. Using this approach, Cu–M alloyed nanorods
can be conveniently synthesized with tunable composition, crystal
structure, and aspect ratio. These nanorods have also been demonstrated
as a unique system for investigation of the structural and compositional
effects on their optical and catalytic properties