Voltammetry and electron-transfer dynamics in a molecular melt of a 1.2 nm metal quantum dot

Dongil Lee, Robert L. Donkers, Joseph M. DeSimone, Royce W. Murray

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

New molecular melts of nanoparticles have been obtained by place exchanging thiolated poly(ethyleneglycol, MW = 350) ligands into the monolayer shells of the quantum dot nanoparticle Au38(phenylethylthiolate)24. These melts are nearly monodisperse in monolayer protected Au clusters with core diameters of 1.2 nm. LiClO4 electrolyte can be dissolved in the melt via the PEG component of the protecting monolayer, producing an ionically conductive nanophase and enabling voltammetry of the undiluted, semisolid nanoparticle molecular melt. The optical and electrochemical charging properties of the small nanoparticles have molecule-like characteristics (as opposed to quantized double layer charging) both in dilute fluid-solvent solutions and as undiluted melts. Potential step chronoamperometry shows that electronic charge is transported through the melt by diffusion-like core-core electron hopping reactions with a rate constant of 2 × 104 s-1.

Original languageEnglish
Pages (from-to)1182-1183
Number of pages2
JournalJournal of the American Chemical Society
Volume125
Issue number5
DOIs
Publication statusPublished - 2003 Feb 5

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Quantum Dots
Voltammetry
Nanoparticles
Semiconductor quantum dots
Metals
Electrons
Monolayers
Chronoamperometry
Electrolytes
Polyethylene glycols
Rate constants
Ligands
Molecules
Fluids

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Lee, Dongil ; Donkers, Robert L. ; DeSimone, Joseph M. ; Murray, Royce W. / Voltammetry and electron-transfer dynamics in a molecular melt of a 1.2 nm metal quantum dot. In: Journal of the American Chemical Society. 2003 ; Vol. 125, No. 5. pp. 1182-1183.
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Voltammetry and electron-transfer dynamics in a molecular melt of a 1.2 nm metal quantum dot. / Lee, Dongil; Donkers, Robert L.; DeSimone, Joseph M.; Murray, Royce W.

In: Journal of the American Chemical Society, Vol. 125, No. 5, 05.02.2003, p. 1182-1183.

Research output: Contribution to journalArticle

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AB - New molecular melts of nanoparticles have been obtained by place exchanging thiolated poly(ethyleneglycol, MW = 350) ligands into the monolayer shells of the quantum dot nanoparticle Au38(phenylethylthiolate)24. These melts are nearly monodisperse in monolayer protected Au clusters with core diameters of 1.2 nm. LiClO4 electrolyte can be dissolved in the melt via the PEG component of the protecting monolayer, producing an ionically conductive nanophase and enabling voltammetry of the undiluted, semisolid nanoparticle molecular melt. The optical and electrochemical charging properties of the small nanoparticles have molecule-like characteristics (as opposed to quantized double layer charging) both in dilute fluid-solvent solutions and as undiluted melts. Potential step chronoamperometry shows that electronic charge is transported through the melt by diffusion-like core-core electron hopping reactions with a rate constant of 2 × 104 s-1.

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