Seeded co-reduction of Cu-containing bimetallic nanostructures and their catalytic applications

by Chen, Jingyi; Chen, Shutang; Jenkins, Samir V.; Miller, Emily K.

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A general strategy to synthesize Cu-M (M=Au, Pt, or Pd) bimetallic nanorods is reported which is based on a seeded co-redn. 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 heterodimmer 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 Cu-rich side of these Janus nanoparticles by retarding redn. kinetics of Cu through galvanic replacement. Using this approach, Cu-M alloyed nanorods can be conveniently synthesized with tunable compn., crystal structure, and aspect ratio. These nanorods provide a unique system for investigation of the structural and compositional effects on their optical and catalytic properties.