Electron hopping dynamics in Au38 nanoparticle langmuir monolayers at the air/water interface

Junhyung Kim, Dongil Lee

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The electron-transfer dynamics between nanoparticles has been studied as a function of interparticle distance by in situ voltammetry of well-defined monolayers of a metal quantum dot nanoparticle Au38(hexanethiolate)24. The interparticle distance is precisely controlled by the Langmuir technique and addition of various lengths of dithiol linkers (HS(CH2)nSH; n = 5, 6, 8, and 9). Voltammograms of Au38 monolayers display a well-defined single-electron charging peak that increases remarkably with decreasing the interparticle distance. The diffusion coefficient and rate constant calculated from the peak current for core-core electron hopping reaction both exponentially increase respectively, from 3.3 × 10-10 to 5.2 × 10-9 cm2/s and 2.2 × 104 to 5.0 × 105 s-1 as the distance decreases from 13.3 to 9.5 Å and then levels off at 8.0 Å. These rate constants are in good agreement with the literature values, demonstrating that the present experimental approach provides a powerful way to investigate the correlation between the electron-transfer dynamics and nanoparticle assembly structure.

Original languageEnglish
Pages (from-to)4518-4519
Number of pages2
JournalJournal of the American Chemical Society
Volume128
Issue number14
DOIs
Publication statusPublished - 2006 Apr 12

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All Science Journal Classification (ASJC) codes

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

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