Functional Polymer Microspheres as ‘Turn-off’ Chemosensors for Detection of Copper Cations
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.