TY - JOUR
T1 - Preparation of thermo-responsive electrospun nanofibers containing rhodamine-based fluorescent sensor for Cu2+ detection
AU - Wu, Wen Chung
AU - Lai, Hsiao Jen
N1 - Funding Information:
The financial support from the Ministry of Science and Technology of Taiwan is highly appreciated. This research was also supported in part by the Headquarters of University Advancement at the National Cheng Kung University, which is sponsored by the Ministry of Education, Taiwan, ROC.
Publisher Copyright:
© 2016, Springer Science+Business Media Dordrecht.
PY - 2016/11/1
Y1 - 2016/11/1
N2 - A series of Cu2+-sensing nanofibers has been successfully prepared by electrospinning of poly[(N-isopropylacrylamide)-co-(N-hydroxymethyl acrylamide)-co-(4-rhodamine hydrazonomethyl-3-hydroxy-phenyl methacrylate)] [poly(NIPAAm-co-NMA-co-RHPMA), PNNR] random copolymers. These PNNR copolymers were synthesized by free radical copolymerization of three monomers, thermo-responsive NIPAAm, chemically crosslinkable NMA and Cu2+-sensing RHPMA, with the composition of RHPMA in the range of 2.4–16.3 wt%. In acidic environments, the PNNR copolymers showed highly selective and sensitive recognition and displayed “ON-OFF” fluorescence toward Cu2+ both in solution and in solid state (thin films and nanofibers). From the quantitative analysis via Stern-Volmer plots, PNNR nanofibers exhibited comparable Stern-Volmer constants as those of PNNR solutions in the order of 104 M−1, which are much higher than those of PNNR thin films. The enhanced sensitivity of PNNR electrospun nanofibers is attributed to their higher surface area compared to dip-coating films. The PNNR nanofibers also exhibited an on/off switchable sensing behavior in response to temperature change due to the hydrophilic-hydrophobic transition of PNIPAAm. In addition, the binding of PNNR with Cu2+ is chemically reversible both in solution and in nanofibers with the treatment of Na4EDTA.
AB - A series of Cu2+-sensing nanofibers has been successfully prepared by electrospinning of poly[(N-isopropylacrylamide)-co-(N-hydroxymethyl acrylamide)-co-(4-rhodamine hydrazonomethyl-3-hydroxy-phenyl methacrylate)] [poly(NIPAAm-co-NMA-co-RHPMA), PNNR] random copolymers. These PNNR copolymers were synthesized by free radical copolymerization of three monomers, thermo-responsive NIPAAm, chemically crosslinkable NMA and Cu2+-sensing RHPMA, with the composition of RHPMA in the range of 2.4–16.3 wt%. In acidic environments, the PNNR copolymers showed highly selective and sensitive recognition and displayed “ON-OFF” fluorescence toward Cu2+ both in solution and in solid state (thin films and nanofibers). From the quantitative analysis via Stern-Volmer plots, PNNR nanofibers exhibited comparable Stern-Volmer constants as those of PNNR solutions in the order of 104 M−1, which are much higher than those of PNNR thin films. The enhanced sensitivity of PNNR electrospun nanofibers is attributed to their higher surface area compared to dip-coating films. The PNNR nanofibers also exhibited an on/off switchable sensing behavior in response to temperature change due to the hydrophilic-hydrophobic transition of PNIPAAm. In addition, the binding of PNNR with Cu2+ is chemically reversible both in solution and in nanofibers with the treatment of Na4EDTA.
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U2 - 10.1007/s10965-016-1115-1
DO - 10.1007/s10965-016-1115-1
M3 - Article
AN - SCOPUS:84990864158
SN - 1022-9760
VL - 23
JO - Journal of Polymer Research
JF - Journal of Polymer Research
IS - 11
M1 - 223
ER -