Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (3): 583.doi: 10.7503/cjcu20180470

• Polymer Chemistry • Previous Articles     Next Articles

Preparation of Complex Nanogel with Up-conversion Fluorescence-responsive Performance and Its Fluorescence Energy Transfer Behavior

LIANG Donglei, SONG Qiusheng*(), YAO Yutian, LIU Ben   

  1. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
  • Received:2019-06-29 Online:2019-03-10 Published:2019-01-12
  • Contact: SONG Qiusheng E-mail:sqshfut@126.com
  • Supported by:
    † Supported by the Innovational Foundation of Hefei University of Technology, China(No.2018CXCY218).

Abstract:

A functionalized NaYF4∶Yb3+,Er3+ nanocrystal was prepared by hydrothermal method and decorated with 3-benzylsulfanylthio-carbonylsufanylpropionic acid(BSPA). Moreover, vinyl functional Rhodamine 6G monomer(R6GHA) was synthesized from rhodamine 6G(R6G) by a series of chemical reactions. Then, a novel complex fluorescent nanogel of NaYF4∶Yb3+,Er3+/PNIPAm-co-R6GHA, which possesses multiple response, was prepared by reversible addition-fragmentation chain transfer(RAFT) polymerization and click reaction. In the as-prepared complex fluorescent nanogels, the functionalized nanocrystal and R6GHA form donor/receptor pairs of fluorescence resonance energy transfer(FRET). The microstructure of the nanogels was characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and differential scanning calorimeter(DSC). The fluorescence response of the nanogel to pH value, ambient temperature and different metal ions were investigated by photoluminescence(PL) and the mechanism was discussed in detail. The results show that fluorescence emission of the nanogels is influenced greatly by environmental temperature, and the composite nanogels have selective fluorescence response to Hg2+. In the presence of H+ or Hg2+, energy can transfer from the nanocrystals to R6GHA moieties under 980 nm excitation. The detection of the concentration of Hg2+ can be achieved by the change of intensity ratio of characteristic fluorescence emission peaks of nanocrystals and R6GHA moieties.

Key words: Rare earth nanocrystal, Up-conversion fluorescence-responsive performance, Nanogel, Fluorescence resonance energy transfer, Reversible addition-fragmentation chain transfer polymerization

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