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Polymers 2017, 9(4), 136;

Novel Magnet and Thermoresponsive Chemosensory Electrospinning Fluorescent Nanofibers and Their Sensing Capability for Metal Ions

Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 10608, Taiwan
Institute of Glycosciences, Grenoble Alpes University, CNRS, CERMAV UPR 5301, 38000 Grenoble, France
Department of Materials Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Po-Chih Yang
Received: 27 February 2017 / Revised: 4 April 2017 / Accepted: 6 April 2017 / Published: 10 April 2017
(This article belongs to the Special Issue Polymers for Chemosensing)
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Novel multifunctional switchable chemosensors based on fluorescent electrospun (ES) nanofibers with sensitivity toward magnetism, temperature, and mercury ions (Hg2+) were prepared using blends of poly(N-isopropylacrylamide)-co-(N-methylolacrylamide)-co-(Acrylic acid), the fluorescent probe 1-benzoyl-3-[2-(2-allyl-1,3-dioxo-2,3-dihydro-1Hbenzo[de]isoquinolin-6-ylamino)-ethyl]-thiourea (BNPTU), and magnetite nanoparticles (NPs), and a single-capillary spinneret. The moieties of N-isopropylacrylamide, N-methylolacrylamide, acrylic acid, BNPTU, and Iron oxide (Fe3O4) NPs were designed to provide thermoresponsiveness, chemical cross-linking, Fe3O4 NPs dispersion, Hg2+ sensing, and magnetism, respectively. The prepared nanofibers exhibited ultrasensitivity to Hg2+ (as low as 10−3 M) because of an 80-nm blueshift of the emission maximum (from green to blue) and 1.6-fold enhancement of the emission intensity, as well as substantial volume (or hydrophilic to hydrophobic) changes between 30 and 60 °C, attributed to the low critical solution temperature of the thermoresponsive N-isopropylacrylamide moiety. Such temperature-dependent variations in the presence of Hg2+ engendered distinct on–off switching of photoluminescence. The magnetic ES nanofibers can be collected using a magnet rather than being extracted through alternative methods. The results indicate that the prepared multifunctional fluorescent ES nanofibrous membranes can be used as naked eye sensors and have the potential for application in multifunctional environmental sensing devices for detecting metal ions, temperature, and magnetism as well as for water purification sensing filters. View Full-Text
Keywords: electrospun nanofibers; heavy metal ions; magnetic; fluorescent sensing; chemosensory electrospun nanofibers; heavy metal ions; magnetic; fluorescent sensing; chemosensory

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Liang, F.-C.; Luo, Y.-L.; Kuo, C.-C.; Chen, B.-Y.; Cho, C.-J.; Lin, F.-J.; Yu, Y.-Y.; Borsali, R. Novel Magnet and Thermoresponsive Chemosensory Electrospinning Fluorescent Nanofibers and Their Sensing Capability for Metal Ions. Polymers 2017, 9, 136.

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