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Electric field induced fluorescence modulation of single molecules in PMMA based on electron transfer.

Chen R, Gao Y, Zhang G, Wu R, Xiao L, Jia S - Int J Mol Sci (2012)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University, Taiyuan 030006, China; E-Mails: chenry421@163.com (R.C.); ggnnool@163.com (Y.G.); gfzhang@mail.sxu.cn (G.Z.); Wurx464628021@163.com (R.W.); tjia@sxu.edu.cn (S.J.).

ABSTRACT
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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(a) Distribution of EF-induced fluorescence modulation depth for single SR molecules in PMMA at EFs of 0.75 MV/cm and 1.05 MV/cm, respectively; (b) Distribution of the transient response for field-induced fluorescence quenching molecules and field-induced fluorescence enhancement molecules under EFs of 0.75 MV/cm and 1.05 MV/cm, with the vertical axis being the EF-induced response time of fluorescence and the horizontal axis the recovery time of fluorescence when the EF is turned off.
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f3-ijms-13-11130: (a) Distribution of EF-induced fluorescence modulation depth for single SR molecules in PMMA at EFs of 0.75 MV/cm and 1.05 MV/cm, respectively; (b) Distribution of the transient response for field-induced fluorescence quenching molecules and field-induced fluorescence enhancement molecules under EFs of 0.75 MV/cm and 1.05 MV/cm, with the vertical axis being the EF-induced response time of fluorescence and the horizontal axis the recovery time of fluorescence when the EF is turned off.

Mentions: In addition to the qualitative variation of the fluorescence of individual molecules under different EFs, the statistical distribution of modulation depth and transient response time of single SR molecules under EFs of 0.75 MV/cm and 1.05 MV/cm were investigated. Figure 3a shows the distribution of fluorescence modulation depth of the total response molecules at an EF of 0.75 MV/cm and 1.05 MV/cm. It was found that the modulation depth became larger at higher field amplitudes. The most probable value of modulation depth was moved to 0.55 at an EF of 1.05 MV/cm compared with 0.32 of 0.75 MV/cm. Figure 3b shows the time constants of molecules, which have non-instantaneous fluorescence response under EF of 0.75 MV/cm and 1.05 MV/cm. Under an EF of 0.75 MV/cm, it was found that the time constants of EF-induced fluorescence quenching or enhancement were larger than that of fluorescence recovery after the EF was turned off. Under the EF of 1.05 MV/cm, the average time constant of EF-induced quenching or enhancement was found to be smaller than the value at 0.75 MV/cm. Meanwhile, the average time constant of fluorescence recovery at EF of 1.05 MV/cm seemed to be similar to that of 0.75 MV/cm.


Electric field induced fluorescence modulation of single molecules in PMMA based on electron transfer.

Chen R, Gao Y, Zhang G, Wu R, Xiao L, Jia S - Int J Mol Sci (2012)

(a) Distribution of EF-induced fluorescence modulation depth for single SR molecules in PMMA at EFs of 0.75 MV/cm and 1.05 MV/cm, respectively; (b) Distribution of the transient response for field-induced fluorescence quenching molecules and field-induced fluorescence enhancement molecules under EFs of 0.75 MV/cm and 1.05 MV/cm, with the vertical axis being the EF-induced response time of fluorescence and the horizontal axis the recovery time of fluorescence when the EF is turned off.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3472734&req=5

f3-ijms-13-11130: (a) Distribution of EF-induced fluorescence modulation depth for single SR molecules in PMMA at EFs of 0.75 MV/cm and 1.05 MV/cm, respectively; (b) Distribution of the transient response for field-induced fluorescence quenching molecules and field-induced fluorescence enhancement molecules under EFs of 0.75 MV/cm and 1.05 MV/cm, with the vertical axis being the EF-induced response time of fluorescence and the horizontal axis the recovery time of fluorescence when the EF is turned off.
Mentions: In addition to the qualitative variation of the fluorescence of individual molecules under different EFs, the statistical distribution of modulation depth and transient response time of single SR molecules under EFs of 0.75 MV/cm and 1.05 MV/cm were investigated. Figure 3a shows the distribution of fluorescence modulation depth of the total response molecules at an EF of 0.75 MV/cm and 1.05 MV/cm. It was found that the modulation depth became larger at higher field amplitudes. The most probable value of modulation depth was moved to 0.55 at an EF of 1.05 MV/cm compared with 0.32 of 0.75 MV/cm. Figure 3b shows the time constants of molecules, which have non-instantaneous fluorescence response under EF of 0.75 MV/cm and 1.05 MV/cm. Under an EF of 0.75 MV/cm, it was found that the time constants of EF-induced fluorescence quenching or enhancement were larger than that of fluorescence recovery after the EF was turned off. Under the EF of 1.05 MV/cm, the average time constant of EF-induced quenching or enhancement was found to be smaller than the value at 0.75 MV/cm. Meanwhile, the average time constant of fluorescence recovery at EF of 1.05 MV/cm seemed to be similar to that of 0.75 MV/cm.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University, Taiyuan 030006, China; E-Mails: chenry421@163.com (R.C.); ggnnool@163.com (Y.G.); gfzhang@mail.sxu.cn (G.Z.); Wurx464628021@163.com (R.W.); tjia@sxu.edu.cn (S.J.).

ABSTRACT
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.

Show MeSH
Related in: MedlinePlus