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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13452
Title: A dual “Turn-on/Turn-off” “FRET” sensor for highly sensitive and selective detection of lead and methylene blue based on fluorescent dansyl tagged copolymer and small molecule diketopyrrolopyrrole
Authors: Chini M.K.
Kumar V.
Maiti B.
De P.
Satapathi, Soumitra
Published in: Polymer Testing
Abstract: Here we report, a multimodal sensing platform for sensitive and selective detection of heavy metal Lead (Pb+2) and organic dye (Methylene Blue) employing a novel FRET pair between a fluorescent polymer and a small molecule. The FRET pair consists of the highly fluorescent dansyl tagged copolymer P(MMA-co-Dansyl-Ala-HEMA) (DCP) and small molecule diketopyrrolopyrrole (DPP). The overlap integral of the FRET pair is calculated to be 1.14 × 1016 nm4/(M*cm) and energy transfer efficiency is determined to be 25%. The fluorescence intensity of the studied FRET pair has been found to be quenched (“Turn Off”) and enhanced (“Turn On”) in the presence of methylene blue (MB) and lead (Pb+2) respectively. The FRET pair shows a strong affinity for Pb+2 ions with very low detection limit (LOD) (27.8 ppm). High KSV (3.9 × 104 M−1) for MB sensing with LOD value 295 ppb indicates enhanced photo-induced electron transfer from FRET pair to MB. The metal-induced modulation of the self-assembled polymer-small molecule-Pb complex in the solution lead to the photoluminescence enhancement in the presence of Pb+2 and the dynamic quenching is established as the fluorescence Turn-off mechanism in the presence of MB dye. Our multimodal FRET sensing probe offer a common platform for the selective detection of a broad range of toxic pollutants which opens up its possibility of use in field applications. © 2019 Elsevier Ltd
Citation: Polymer Testing (2019), 79(): -
URI: https://doi.org/10.1016/j.polymertesting.2019.105997
http://repository.iitr.ac.in/handle/123456789/13452
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: Dansyl tagged copolymer
Diketopyrrolopyrrole
Methylene Blue
Stern-Volmer constant
ISSN: 1429418
Author Scopus IDs: 57190120798
57195978673
57197982652
7101660872
36610769900
Author Affiliations: Chini, M.K., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Kumar, V., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Maiti, B., Polymer Research Center, Department of Chemical Science, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
De, P., Polymer Research Center, Department of Chemical Science, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
Satapathi, S., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: This work is supported by SERB Young Scientist Award [Grant No: YSS/2015/000061 ] and Department of Science &Technology [Grant No: DST/TM/WTI/2K16/50 ].
Corresponding Author: Satapathi, S.; Department of Physics, Indian Institute of Technology RoorkeeIndia; email: ssphf.fph@iitr.ac.in
Appears in Collections:Journal Publications [PH]

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