Two-Phase Synthesis of Gold-Copper Bimetallic Nanoparticles of Tunable Composition: Toward Optimized Catalytic CO2 Reduction

Daniel M. Hofmann, D. Howard Fairbrother, Robert J. Hamers, Catherine J. Murphy

Research output: Contribution to journalArticle

Abstract

Ultrasmall (≤3 nm) bimetallic nanoparticles with controllable compositions and structure are of great interest for their catalytic activity, especially carbon dioxide reduction. Herein is reported a synthesis for bimetallic AuxCu1-x nanoparticles of tunable composition that takes advantage of complex-ion chemistry. These AuxCu1-x nanoparticles exhibit ultrasmall sizes (∼2 nm), and the observed metal compositions are similar to the nominal metal ratios in the synthesis, roughly 3:1, 1:1, and 1:3 for Au:Cu. The nanoparticles appear to be disordered alloys; no evidence for intermetallic compositions was obtained. Oxidation state analysis of Cu was carried using XPS; after 1 day, only minor oxidation of copper was observed. The original capping agent for the nanoparticles, dodecanethiol, is complexed with sodium dodecyl sulfate to transfer the particles to the aqueous phase.

Original languageEnglish (US)
Pages (from-to)3989-3998
Number of pages10
JournalACS Applied Nano Materials
Volume2
Issue number6
DOIs
StatePublished - Jun 28 2019

Keywords

  • CO reduction
  • bimetallic nanoparticles
  • gold-copper
  • tunable composition
  • two-phase synthesis

ASJC Scopus subject areas

  • Materials Science(all)

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