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Related Experiment Video

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Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Published on: January 11, 2018

Single molecule power-law behavior on a crystalline surface.

Laura K Schirra¹, Brandon S Tackett, Michael L Blumenfeld

¹Department of Chemistry, The University of Arizona, 1306 E. University Blvd., Tucson, Arizona 85721, USA.

The Journal of Chemical Physics

|October 2, 2009

Summary

Single perylene bisimide molecules on aluminum oxide exhibit fluorescence intermittency due to interfacial charge transfer. This behavior, observed on a crystalline surface, is explained by polaron formation, offering insights into single-molecule surface interactions.

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Area of Science:

Surface science
Single-molecule spectroscopy
Organic electronics

Background:

Fluorescence intermittency is a known phenomenon in single molecules.
Interfacial charge transfer is crucial for organic electronic devices.
Understanding molecular behavior on crystalline surfaces is key for device optimization.

Purpose of the Study:

To investigate fluorescence intermittency of single perylene bisimide molecules on Al(2)O(3) (0001).
To elucidate the underlying mechanism of interfacial charge transfer.
To develop a kinetic model for observed intermittency patterns.

Main Methods:

Deposition of single perylene bisimide molecules onto Al(2)O(3) (0001) surface.
Investigation under controlled ultrahigh vacuum conditions.
Analysis of fluorescence intermittency and power-law distributions.

Main Results:

Observed fluorescence intermittency (blinking) in single perylene bisimide molecules.
Identified power-law distributions for bright and dark periods.
Attributed the behavior to activated formation of small polaron states in Al(2)O(3).

Conclusions:

The study provides a kinetic scheme explaining single-molecule fluorescence intermittency on crystalline surfaces.
Findings offer a fundamental understanding of interfacial charge transfer at the single-molecule level.
This work is a step towards controlling molecular behavior on well-defined surfaces for applications.