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Intermittent single-molecule interfacial electron transfer dynamics.

Vasudevanpillai Biju1, Miodrag Micic, Dehong Hu

  • 1Pacific Northwest National Laboratory, Fundamental Science Division, P. O. Box 999, Richland, Washington 99352, USA.

Journal of the American Chemical Society
|July 30, 2004
PubMed
Summary
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Single-molecule studies reveal intermittent electron transfer (ET) dynamics between dyes and TiO(2) nanoparticles. This intermittency, observed in Coumarin 343 and Cresyl Violet, highlights molecule-surface interactions influencing surface reactions.

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Nanotechnology

Background:

  • Interfacial electron transfer (ET) is crucial for many photochemical processes.
  • Understanding single-molecule behavior is key to elucidating complex reaction dynamics.
  • Titanium dioxide (TiO(2)) nanoparticles are widely used in photocatalysis and solar energy conversion.

Purpose of the Study:

  • To investigate the dynamics of photosensitized interfacial electron transfer at the single-molecule level.
  • To explore the role of molecule-surface interactions in regulating interfacial ET.
  • To characterize the heterogeneity and intermittency of ET processes in dye-TiO(2) systems.

Main Methods:

  • Single-molecule fluorescence spectroscopy using time-correlated single-photon counting.

Related Experiment Videos

  • Scanning confocal fluorescence microscopy.
  • Studies on Coumarin 343 (C343) and Cresyl Violet (CV(+)) adsorbed on TiO(2) nanoparticles (NP).

    • Main Results:

    • Observed fluorescence fluctuations and blinking in individual dye molecules on TiO(2) NPs.
    • Identified millisecond-to-second time constants for fluorescence dynamics, indicating inhomogeneity.
    • Attributed fluctuations to interfacial ET rate variations, linked to electronic and Franck-Condon coupling.

    Conclusions:

    • Interfacial ET dynamics are intermittent and molecule-specific, influenced by molecule-surface interactions.
    • Static and dynamic disorders significantly impact interfacial ET reaction dynamics.
    • Single-molecule studies reveal reaction dynamics not observable by ensemble-averaged methods.