Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 13, Issue 9, Pages 11130-11140Publisher
MDPI
DOI: 10.3390/ijms130911130
Keywords
single-molecule fluorescence; modulation; external electric fields; polarization
Funding
- 973 Program [2012CB921603, 2010CB923103]
- 863program [2011AA010801]
- Natural Science Foundation of China [11174187, 11184145, 60978018, 10934004]
- International Science & Technology Cooperation Program of China [2001DFA12490]
- NSFC Project for Excellent Research Team [61121064]
- Natural Science Foundation of Shanxi Province, China [2011091016]
- TSTIT and TYMIT of Shanxi
- Shanxi Province Foundation for Returned Scholars
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We present a method to modulate the fluorescence of non-polar single squaraine-derived rotaxanes molecules embedded in a polar poly(methyl methacrylate) (PMMA) matrix under an external electric field. The electron transfer between single molecules and the electron acceptors in a PMMA matrix contributes to the diverse responses of fluorescence intensities to the electric field. The observed instantaneous and non-instantaneous electric field dependence of single-molecule fluorescence reflects the redistribution of electron acceptors in PMMA induced by electronic polarization and orientation polarization of polar polymer chains in an electric field.
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