Journal
E-POLYMERS
Volume 17, Issue 1, Pages 65-70Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/epoly-2016-0247
Keywords
gold nanoparticles; molecular recognition; poly(N-isopropylacrylamide); sensitive fluorescence; thermo-sensitivity
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Funding
- National Natural Science Foundation of China [50903018]
- Natural Science Foundation for High School of Anhui Province [KJ2014A192, 2014KJ014]
- Support Plan for Young Elite Talents of High School of Anhui Province [gxyqZD2016191]
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Thermosensitive PNIPAM-coated Au nanoparticles (AuNPs@P(NIPAM-co-MADMAC)) were synthesized by the radical grafting through copolymerization of 4-methacryloyloxy-4'-dimethylaminochalcone (MADMAC), MAEL-capped AuNPs and N-isopropylacrylamide (NIPAM) using azobisisobutyronitrile (AIBN) as the initiator. AuNPs@P(NIPAM-co-MADMAC) were characterized by transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), H-1 nuclear magnetic resonance (NMR), and Fourier transform infrared (FTIR) spectroscopy. AuNPs@P(NIPAM-co-MADMAC) exhibited thermo-sensitivity from poly(NIPAM-co-MADMAC) chains and sensitive fluorescence from the MADMAC group. AuNPs@P(NIPAM-co-MADMAC) showed weak fluorescence after the temperature increased from 25 degrees C to 45 degrees C, or after beta-cyclodextrin (beta-CD) was added. Furthermore, it exhibited strong fluorescence when the solvent was changed to ethanol or chloroform.
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