Original Contribution

Colloid and Polymer Science

, Volume 280, Issue 7, pp 653-660

First online:

Preparation of a novel polymeric fluorescent nanoparticle

  • Haifeng GaoAffiliated withDepartment of Macromolecular Science, and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Shanghai, 200433, China
  • , Yiqiang ZhaoAffiliated withDepartment of Macromolecular Science, and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Shanghai, 200433, China
  • , Shoukuan FuAffiliated withDepartment of Macromolecular Science, and the Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Shanghai, 200433, China
  • , Bin LiAffiliated withShanghai Institute of Nuclear Research, Chinese Academy of Science, Shanghai, 201800, China
  • , Minqian LiAffiliated withShanghai Institute of Nuclear Research, Chinese Academy of Science, Shanghai, 201800, China

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Abstract.

A new type of narrowly dispersed fluorescent crosslinked polystyrene (PS) nanoparticles (20–50 nm) was synthesized via a modified microemulsion copolymerization of styrene, crosslinker divinyl benzene (DVB) and a hydrophilic comonomer amino ethyl methacrylate hydrochloride (AEMH), in the presence of pyrene. Characterized by steady-state fluorescence spectra, these nanoparticles show high luminescent intensity and the embedded pyrene has a negligible desorption from the nanoparticles. The emission intensity I1 of the pyrene in the crosslinked nanoparticles is 40 times higher than that of pyrene in toluene or styrene solution with the same concentration. The fluorescence emission intensity can be varied by the amount of the monomer, crosslinker and pyrene, but is influenced little by the amount of AEMH in the range of investigation. The surface of the nanoparticles is modified by amino and amidino functional groups introduced by the comonomer and the initiator 2, 2′-azobis(2-amidinopropane) dihydrochloride (V50), which controls the zeta potential on the particle surface.

Polymeric nanoparticles Fluorescence Pyrene Zeta potential