Electron transfer-induced blinking in Ag nanodot fluorescence

Sandeep A. Patel; Matteo Cozzuol; Joel M. Hales; Chris I. Richards; Matthew Sartin; Jung Cheng Hsiang; Tom Vosch; Joseph W. Perry; Robert M. Dickson

doi:10.1021/jp9079537

Electron transfer-induced blinking in Ag nanodot fluorescence

Sandeep A. Patel, Matteo Cozzuol, Joel M. Hales, Chris I. Richards, Matthew Sartin, Jung Cheng Hsiang, Tom Vosch, Joseph W. Perry, Robert M. Dickson

Chemistry

Research output: Contribution to journal › Article › peer-review

141 Scopus citations

Abstract

Various single-stranded DNA-encapsulated Ag nanoclusters (nanodots) exhibit strong, discrete fluorescence with solvent polarity-dependent absorption and emission throughout the visible and near-IR. All species examined, regardless of their excitation and emission energies, show similar microsecond single-molecule blinking dynamics and near IR transient absorptions. The polarity dependence, microsecond blinking, and indistinguishable microsecond-decaying transient absorption spectra among multiple nanodots suggest a common charge transfer-based mechanism that gives rise to nanodot fluorescence intermittency. Photoinduced charge transfer that is common to all nanodot emitters is proposed to occur from the Ag cluster into the nearby DNA bases to yield a long-lived charge-separated trap state that results in blinking on the single molecule level.

Original language	English
Pages (from-to)	20264-20270
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	113
Issue number	47
DOIs	https://doi.org/10.1021/jp9079537
State	Published - 2009

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Electron transfer-induced blinking in Ag nanodot fluorescence",

abstract = "Various single-stranded DNA-encapsulated Ag nanoclusters (nanodots) exhibit strong, discrete fluorescence with solvent polarity-dependent absorption and emission throughout the visible and near-IR. All species examined, regardless of their excitation and emission energies, show similar microsecond single-molecule blinking dynamics and near IR transient absorptions. The polarity dependence, microsecond blinking, and indistinguishable microsecond-decaying transient absorption spectra among multiple nanodots suggest a common charge transfer-based mechanism that gives rise to nanodot fluorescence intermittency. Photoinduced charge transfer that is common to all nanodot emitters is proposed to occur from the Ag cluster into the nearby DNA bases to yield a long-lived charge-separated trap state that results in blinking on the single molecule level.",

author = "Patel, {Sandeep A.} and Matteo Cozzuol and Hales, {Joel M.} and Richards, {Chris I.} and Matthew Sartin and Hsiang, {Jung Cheng} and Tom Vosch and Perry, {Joseph W.} and Dickson, {Robert M.}",

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T1 - Electron transfer-induced blinking in Ag nanodot fluorescence

AU - Patel, Sandeep A.

AU - Cozzuol, Matteo

AU - Hales, Joel M.

AU - Richards, Chris I.

AU - Sartin, Matthew

AU - Hsiang, Jung Cheng

AU - Vosch, Tom

AU - Perry, Joseph W.

AU - Dickson, Robert M.

PY - 2009

Y1 - 2009

N2 - Various single-stranded DNA-encapsulated Ag nanoclusters (nanodots) exhibit strong, discrete fluorescence with solvent polarity-dependent absorption and emission throughout the visible and near-IR. All species examined, regardless of their excitation and emission energies, show similar microsecond single-molecule blinking dynamics and near IR transient absorptions. The polarity dependence, microsecond blinking, and indistinguishable microsecond-decaying transient absorption spectra among multiple nanodots suggest a common charge transfer-based mechanism that gives rise to nanodot fluorescence intermittency. Photoinduced charge transfer that is common to all nanodot emitters is proposed to occur from the Ag cluster into the nearby DNA bases to yield a long-lived charge-separated trap state that results in blinking on the single molecule level.

AB - Various single-stranded DNA-encapsulated Ag nanoclusters (nanodots) exhibit strong, discrete fluorescence with solvent polarity-dependent absorption and emission throughout the visible and near-IR. All species examined, regardless of their excitation and emission energies, show similar microsecond single-molecule blinking dynamics and near IR transient absorptions. The polarity dependence, microsecond blinking, and indistinguishable microsecond-decaying transient absorption spectra among multiple nanodots suggest a common charge transfer-based mechanism that gives rise to nanodot fluorescence intermittency. Photoinduced charge transfer that is common to all nanodot emitters is proposed to occur from the Ag cluster into the nearby DNA bases to yield a long-lived charge-separated trap state that results in blinking on the single molecule level.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 47

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Electron transfer-induced blinking in Ag nanodot fluorescence

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