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Int. J. Mol. Sci. 2012, 13(9), 12100-12112; doi:10.3390/ijms130912100

Photophysical Behaviors of Single Fluorophores Localized on Zinc Oxide Nanostructures

Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, School of Medicine, University of Maryland School of Medicine, 725 Lombard Street, Baltimore, MD 21201, USA
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Received: 16 July 2012 / Revised: 6 September 2012 / Accepted: 12 September 2012 / Published: 24 September 2012
(This article belongs to the Special Issue Advances in Single Molecule Spectroscopy)
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Abstract

Single-molecule fluorescence spectroscopy has now been widely used to investigate complex dynamic processes which would normally be obscured in an ensemble-averaged measurement. In this report we studied photophysical behaviors of single fluorophores in proximity to zinc oxide nanostructures by single-molecule fluorescence spectroscopy and time-correlated single-photon counting (TCSPC). Single fluorophores on ZnO surfaces showed enhanced fluorescence brightness to various extents compared with those on glass; the single-molecule time trajectories also illustrated pronounced fluctuations of emission intensities, with time periods distributed from milliseconds to seconds. We attribute fluorescence fluctuations to the interfacial electron transfer (ET) events. The fluorescence fluctuation dynamics were found to be inhomogeneous from molecule to molecule and from time to time, showing significant static and dynamic disorders in the interfacial electron transfer reaction processes.
Keywords: zinc oxide nanostructures; single molecule spectroscopy; interfacial electron transfer; radiative decay rate zinc oxide nanostructures; single molecule spectroscopy; interfacial electron transfer; radiative decay rate
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Fu, Y.; Zhang, J.; Lakowicz, J.R. Photophysical Behaviors of Single Fluorophores Localized on Zinc Oxide Nanostructures. Int. J. Mol. Sci. 2012, 13, 12100-12112.

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