writer：Mengmeng Zhang, Xiaowei Si, Xinlin Yang*, Yan Lu, Yinghua Shen
keywords：Polymer microspheres; Fluorescent chemical sensors; Metallic cation.
source：期刊
specific source：Colloid Polymer Science 295 (12), 2383-2393 (2017). DOI: 10.1007/s00396-017-4209-3
Issue time：2017年

Functional polymer micrsopheres with fluorescent

carbazole unit and various functional groups, such as amide, pyridyl and imide,

were prepared by distillation precipitation copolymerization of divinylbenzene

(DVB) as a crosslinker, N-vinylcarbazole (NVCz), together with acrylamide (AAm),

4-vinylpyridine (VPy) and 4-vinylimidazole ((VIM) as functional monomers in

acetonitrile in absence of any stabilizer. The resultant polymer microspheres

were characterized by scanning electron microscopy (SEM), Fourier transform

infrared spectroscopy (FT-IR), UV-Vis spectroscopy, photoluminescent

spectroscopy, inductively coupled plasma (ICP) and X-ray photoelectron

microscopy (XPS). The functional polymer microspheres acted as a ‘turn-off’

chemical sensor with excellent stability for determination of copper cation (Cu2+)

in methanol via the quenching effect of fluorescence after adsorption of Cu2+

from the solution through the capture ability of functional groups, such as

pyridyl, imide and amide on the surface of polymer microspheres. A good linear

relationship was set up between the photoluminescence intensity at the emission

peak of 352 nm and the Cu2+ concentrations ranging from 0 to 1.0 mM

with presence of pyridyl group as a ligand. The effects of the functional

groups were investigated on the fluorescent response for the microspheres as

chemical sensors.