Rational synthesis of heterostructured nanoparticles with morphology control

J Am Chem Soc. 2010 May 12;132(18):6524-9. doi: 10.1021/ja101305x.

Abstract

Rational synthesis of Pt-Au(n) nanoparticles (NPs) has been achieved by overgrowing Au on Pt with n, the number of Pt-Au heterojunctions in each particle, controlled from 1 to 4, and the corresponding NPs in pear-, peanut-, or clover-like morphology. Monte Carlo simulation reveals that the morphology control can be correlated to a thermodynamic equilibrium of the Au coherence energy, the overall particle surface energy, and the heterogeneous Pt-Au interfacial energy in the composite system, which is manipulated by the seeding particle size and solvent polarity. The developed synthetic strategy together with the provided fundamental understanding of heterogeneous nucleation and heterostructure growth could have great potential toward the rational synthesis of composite nanomaterials with morphology control for advanced catalytic and other functional applications.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Catalysis
  • Electrochemistry
  • Fourier Analysis
  • Gold / chemistry*
  • Metal Nanoparticles / chemistry*
  • Methanol / chemistry
  • Microscopy, Electron, Transmission
  • Monte Carlo Method
  • Oxidation-Reduction
  • Particle Size
  • Platinum / chemistry*
  • Solvents / chemistry

Substances

  • Solvents
  • Platinum
  • Gold
  • Methanol