Single-molecule interfacial electron transfer in donor-bridge-nanoparticle acceptor complexes

Shengye Jin, Robert C. Snoeberger, Abey Issac, David Stockwell, Victor S. Batista, Tianquan Lian*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Photoinduced interfacial electron transfer (IET) in sulforhodamine B (SRhB)-aminosilane-Tin oxide (SnO2) nanoparticle donor-bridge- acceptor complexes has been studied on a single molecule and ensemble average level. On both SnO2 and ZrO2, the sum of single molecule fluorescence decays agree with the ensemble average results, suggesting complete sampling of molecules under single molecule conditions. Shorter fluorescence lifetime on SnO2 than on ZrO2 is observed and attributed to IET from SRhB to SnO2. Single molecule lifetimes fluctuate with time and vary among different molecules, suggesting both static and dynamic IET heterogeneity in this system. Computational modeling of the complexes shows a distribution of molecular conformation, leading to a distribution of electronic coupling strengths and ET rates. It is likely that the conversion between these conformations led to the fluctuation of ET rate and fluorescence lifetime on the single molecule level.

Original languageEnglish
Pages (from-to)14309-14319
Number of pages11
JournalJournal of Physical Chemistry B
Volume114
Issue number45
DOIs
Publication statusPublished - Dec 8 2010

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

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