Journal
ACS APPLIED POLYMER MATERIALS
Volume 3, Issue 8, Pages 4017-4026Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.1c00540
Keywords
copolymer; nitroaromatics; FRET; fluorescence quenching sensor; ultrafast transient absorption
Funding
- MHRD for the research fellowship
- Indian Institute of Science Education and Research Kolkata
- DST Solar Energy Research [DST/SERI/TMD/D-47]
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In this study, optically resonant donor copolymers were utilized to enhance the sensitivity of a fluorescent copolymer towards electron-deficient nitroaromatic compounds (NACs) through ultrafast Forster resonance energy transfer (FRET). This method achieved a sensitivity of less than 1 mu M with a high Stern-Volmer constant. Comprehensive analysis using various spectroscopic techniques elucidated the quenching mechanism involved in the detection of NACs.
We report here that optically resonant donor copolymers are used to amplify the sensitivity of an electron-rich fluorescent copolymer toward electron-deficient nitroaromatic compounds (NACs). In a polymer-polymer system, we found that ultrafast Forster resonance energy transfer (FRET) enhances the sensitivity of the primeval fluorescent polymer sensor by 6-fold approximately toward the conventional NACs like 2,4-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT), and 2,4,6-trinitrophenol (TNP). The present article reports an optical sensor for sensitive detection of NACs by using a fluorescent probe based on FRET phenomena between P[DMA-co-(Boc-TrpEMA)] (RP) bearing a tryptophan derivative as a donor and P[MMA-co-(AlaHEMA)-co-(Dansyl-Ala-HEMA)] (DCP) bearing a dansyl derivative in the side chain as an acceptor. This elegant method thus paves the way to achieving a sensitivity <1 mu M with a very high value of Stern-Volmer constant. Further, UV-vis absorbance spectroscopy, cyclic voltammetry, ultrafast transient absorption spectroscopy, time-resolved, and steady-state fluorescence spectroscopy were performed to establish the quenching mechanism comprehensively. We also carried out a contact mode analysis in solid-state phase through strip tests for visual detection of NACs in ambient conditions. This unique and quality performance of our sensing probe makes it convenient for naked-eye detection and therefore gives an escalation for stand-alone sensors for NACs, particularly reinforcement in the field of analytical and forensic sciences.
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