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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 M for fluorescence quenching (light gray, 46 molecules) as well as fluorescence enhancement of single SR molecules (red, 38 molecules) in PMMA matrix at 0.75 MV/cm; (b) Typical SMF modulation pattern obtained under different EF.
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f2-ijms-13-11130: (a) Distribution of EF-induced fluorescence modulation depth M for fluorescence quenching (light gray, 46 molecules) as well as fluorescence enhancement of single SR molecules (red, 38 molecules) in PMMA matrix at 0.75 MV/cm; (b) Typical SMF modulation pattern obtained under different EF.

Mentions: In order to investigate the heterogeneity of PMMA matrix under EF, modulation depth (M) was used to qualitatively describe the response of SMF under EF, which is defined as (Imax − Imin)/Imax, with Imax and Imin being the maximum and minimum fluorescence intensity of the individual molecule. Figure 2a shows the distribution of the EF-induced fluorescence modulation depth of 84 single SR molecules at an EF of 0.75 MV/cm. While 38 of these molecules showed fluorescence enhancement, the others showed fluorescence quenching. The most probable value of modulation depth is about 0.32 both for enhancement and quenching at 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 M for fluorescence quenching (light gray, 46 molecules) as well as fluorescence enhancement of single SR molecules (red, 38 molecules) in PMMA matrix at 0.75 MV/cm; (b) Typical SMF modulation pattern obtained under different EF.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2-ijms-13-11130: (a) Distribution of EF-induced fluorescence modulation depth M for fluorescence quenching (light gray, 46 molecules) as well as fluorescence enhancement of single SR molecules (red, 38 molecules) in PMMA matrix at 0.75 MV/cm; (b) Typical SMF modulation pattern obtained under different EF.
Mentions: In order to investigate the heterogeneity of PMMA matrix under EF, modulation depth (M) was used to qualitatively describe the response of SMF under EF, which is defined as (Imax − Imin)/Imax, with Imax and Imin being the maximum and minimum fluorescence intensity of the individual molecule. Figure 2a shows the distribution of the EF-induced fluorescence modulation depth of 84 single SR molecules at an EF of 0.75 MV/cm. While 38 of these molecules showed fluorescence enhancement, the others showed fluorescence quenching. The most probable value of modulation depth is about 0.32 both for enhancement and quenching at 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