In Situ Single-Nanoparticle Spectroscopy Study of Bimetallic Nanostructure Formation

Jeremy G. Smith, Indranath Chakraborty, Prashant Jain

Research output: Contribution to journalArticle

Abstract

Bimetallic nanostructures (NSs), with utility in catalysis, are typically prepared using galvanic exchange (GE), but the final catalyst morphology is dictated by the dynamics of the process. In situ single nanoparticle (NP) optical scattering spectroscopy, coupled with ex situ electron microscopy, is used to capture the dynamic structural evolution of a bimetallic NS formed in a GE reaction between Ag and [PtCl 6 ] 2− . We identify an early stage involving anisotropic oxidation of Ag to AgCl concomitant with reductive deposition of small Pt clusters on the NS surface. At later stages of GE, unreacted Ag inclusions phase segregate from the overcoated AgCl as a result of lattice strain between Ag and AgCl. The nature of the structural evolution elucidates why multi-domain Ag/AgCl/Pt NSs result from the GE process. The complex structural dynamics, determined from single-NP trajectories, would be masked in ensemble studies due to heterogeneity in the response of different NPs.

Original languageEnglish (US)
Pages (from-to)9979-9983
Number of pages5
JournalAngewandte Chemie - International Edition
Volume55
Issue number34
DOIs
StatePublished - Jan 1 2016

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Nanostructures
Spectroscopy
Nanoparticles
Structural dynamics
Electron microscopy
Catalysis
Ion exchange
Trajectories
Scattering
Oxidation
Catalysts

Keywords

  • alloys
  • catalysis
  • nanoscience
  • plasmon
  • single-molecule spectroscopy

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

In Situ Single-Nanoparticle Spectroscopy Study of Bimetallic Nanostructure Formation. / Smith, Jeremy G.; Chakraborty, Indranath; Jain, Prashant.

In: Angewandte Chemie - International Edition, Vol. 55, No. 34, 01.01.2016, p. 9979-9983.

Research output: Contribution to journalArticle

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