Gold nanoelectrodes of varied size: Transition to molecule-like charging

Shaowei Chen, Roychelle S. Ingram, Michael J. Hostetler, Jeremy J. Pietron, Royce W. Murray, T. Gregory Schaaff, Joseph T. Khoury, Marcos M. Alvarez, Robert L. Whetten

Research output: Contribution to journalReview articlepeer-review

1047 Scopus citations

Abstract

A transition from metal-like double-layer capacitive charging to redox- like charging was observed in electrochemical ensemble Coulomb staircase experiments on solutions of gold nanoparticles of varied core size. The monodisperse gold nanoparticles are stabilized by short-chain alkanethiolate monolayers and have 8 to 38 kilodaltons core mass (1.1 to 1.9 nanometers in diameter). Larger cores display Coulomb staircase responses consistent with double-layer charging of metal-electrolyte interfaces, whereas smaller core nanoparticles exhibit redox chemical character, including a large central gap. The change in behavior is consistent with new near-infrared spectroscopic data showing an emerging gap between the highest occupied and lowest unoccupied orbitals of 0.4 to 0.9 electron volt.

Original languageEnglish (US)
Pages (from-to)2098-2101
Number of pages4
JournalScience
Volume280
Issue number5372
DOIs
StatePublished - Jun 26 1998
Externally publishedYes

ASJC Scopus subject areas

  • General

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