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Electron transfer-based single molecule fluorescence as a probe for nano-environment dynamics.

Chen R, Wu R, Zhang G, Gao Y, Xiao L, Jia S - Sensors (Basel) (2014)

Bottom Line: Electron transfer (ET) is one of the most important elementary processes that takes place in fundamental aspects of biology, chemistry, and physics.We review some applications, including the dynamics of glass-forming systems, surface binding events, interfacial ET on semiconductors, and the external field-induced dynamics of polymers.All these examples show that the ET-induced changes of fluorescence trajectory and lifetime of single molecules can be used to sensitively probe the surrounding nano-environments.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. chenry421@163.com.

ABSTRACT
Electron transfer (ET) is one of the most important elementary processes that takes place in fundamental aspects of biology, chemistry, and physics. In this review, we discuss recent research on single molecule probes based on ET. We review some applications, including the dynamics of glass-forming systems, surface binding events, interfacial ET on semiconductors, and the external field-induced dynamics of polymers. All these examples show that the ET-induced changes of fluorescence trajectory and lifetime of single molecules can be used to sensitively probe the surrounding nano-environments.

No MeSH data available.


Fluorescence modulation of a single-MEH-PPV molecule by photooxidation and an electric field. Reprinted with permission from Ref. [69]. Copyright (2004) American Chemical Society.
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f9-sensors-14-02449: Fluorescence modulation of a single-MEH-PPV molecule by photooxidation and an electric field. Reprinted with permission from Ref. [69]. Copyright (2004) American Chemical Society.

Mentions: The electric field effects on the luminescence of single semiconductor nanocrystals [63–67] and single conjugated polymers [68–73] have been the subject of a significant amount of experimental studies during the past two decades. Park et al. studied the direct correlation of photobleaching and charge carrier effects of a conjugated polymer by applying an electric field to induce charge transport [69]. Fluorescence blinking of MEH-PPV has been attributed to efficient energy transfer to a reversibly formed, long-lived quencher site, involving some types of local photooxidation of MEH-PPV. Particularly, two characteristic effects have been found when an electric field was applied. For unphotooxidized MEH-PPV, fluorescence was quenched by positive bias. However, for photoxidized molecules an extraordinary repairing of photobleaching was observed when applying a negative bias, as shown in Figure 9. The results imply that the quenching is attributed to reversible ET between singlet excitons and injected holes.


Electron transfer-based single molecule fluorescence as a probe for nano-environment dynamics.

Chen R, Wu R, Zhang G, Gao Y, Xiao L, Jia S - Sensors (Basel) (2014)

Fluorescence modulation of a single-MEH-PPV molecule by photooxidation and an electric field. Reprinted with permission from Ref. [69]. Copyright (2004) American Chemical Society.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3958234&req=5

f9-sensors-14-02449: Fluorescence modulation of a single-MEH-PPV molecule by photooxidation and an electric field. Reprinted with permission from Ref. [69]. Copyright (2004) American Chemical Society.
Mentions: The electric field effects on the luminescence of single semiconductor nanocrystals [63–67] and single conjugated polymers [68–73] have been the subject of a significant amount of experimental studies during the past two decades. Park et al. studied the direct correlation of photobleaching and charge carrier effects of a conjugated polymer by applying an electric field to induce charge transport [69]. Fluorescence blinking of MEH-PPV has been attributed to efficient energy transfer to a reversibly formed, long-lived quencher site, involving some types of local photooxidation of MEH-PPV. Particularly, two characteristic effects have been found when an electric field was applied. For unphotooxidized MEH-PPV, fluorescence was quenched by positive bias. However, for photoxidized molecules an extraordinary repairing of photobleaching was observed when applying a negative bias, as shown in Figure 9. The results imply that the quenching is attributed to reversible ET between singlet excitons and injected holes.

Bottom Line: Electron transfer (ET) is one of the most important elementary processes that takes place in fundamental aspects of biology, chemistry, and physics.We review some applications, including the dynamics of glass-forming systems, surface binding events, interfacial ET on semiconductors, and the external field-induced dynamics of polymers.All these examples show that the ET-induced changes of fluorescence trajectory and lifetime of single molecules can be used to sensitively probe the surrounding nano-environments.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China. chenry421@163.com.

ABSTRACT
Electron transfer (ET) is one of the most important elementary processes that takes place in fundamental aspects of biology, chemistry, and physics. In this review, we discuss recent research on single molecule probes based on ET. We review some applications, including the dynamics of glass-forming systems, surface binding events, interfacial ET on semiconductors, and the external field-induced dynamics of polymers. All these examples show that the ET-induced changes of fluorescence trajectory and lifetime of single molecules can be used to sensitively probe the surrounding nano-environments.

No MeSH data available.