Single-Crystal Electrochemistry Reveals Why Metal Nanowires Grow

Myung Jun Kim, Samuel Alvarez, Zihao Chen, Kristen A. Fichthorn, Benjamin J. Wiley

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Shape-control is used to tune the properties of metal nanostructures in applications ranging from catalysts to touch screens, but the origins of anisotropic growth of metal nanocrystals in solution are unknown. We show single-crystal electrochemistry can test hypotheses for why nanostructures form and predict conditions for anisotropic growth by quantifying the degree to which different species cause facet-selective metal deposition. Electrochemical measurements show disruption of alkylamine monolayers by chloride ions causes facet-selective Cu deposition. An intermediate range of chloride concentrations maximizes facet-selective Cu deposition on single crystals and produces the highest aspect ratio nanowires in a solution-phase synthesis. DFT calculations similarly show an intermediate monolayer coverage of chloride displaces the alkylamine capping agent from the ends but not the sides of a nanowire, facilitating anisotropic growth.

Original languageEnglish (US)
Pages (from-to)14740-14746
Number of pages7
JournalJournal of the American Chemical Society
Volume140
Issue number44
DOIs
StatePublished - Nov 7 2018

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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