Issue 40, 2012

Magnetic CMP microspheres: multifunctional poly(phenylene ethynylene) frameworks with covalently built-in Fe3O4nanocrystals exhibiting pronounced sensitivity for acetaminophen microdetection

Abstract

A novel multifunctional conjugated nanoporous polymer colloid (CNPC) combined with metal nanocrystals has been synthesized using the Sonogashira coupling reaction in a toluene-in-water miniemulsion. It is composed of a poly(phenylene ethynylene) (PPE) network that is covalently inlaid with the locked-in Fe3O4 nanocrystals. The Fe3O4@CNPC has a narrowly distributed size and uniform morphology, preserves the advanced porosity and fluorescence emission of the conjugated polymer network, and shows rapid magnetic response and high catalytic activity. The magnetic content can be controlled during the synthesis. This is accompanied by a corresponding enhancement of the size and surface area of the mesopores. In view of those characteristics, Fe3O4@CNPC is able to behave as fluorescence sensor for the detection of phenolic compounds. Acetaminophen (APAP) has been used as a model compound and the test results demonstrate that the Fe3O4-catalyzed oxidation of APAP takes place within the pores of the PPE network in the presence of H2O2. The oxidized intermediates are reactive radicals and can remove electrons from the π-conjugated PPE network, eventually leading to a decrease or even quenching of its fluorescence. Since the multiple functions of Fe3O4@CNPC fully cooperate, it produces a rapid optical response and superior sensitivity for the detection of APAP at micromolar concentrations.

Graphical abstract: Magnetic CMP microspheres: multifunctional poly(phenylene ethynylene) frameworks with covalently built-in Fe3O4 nanocrystals exhibiting pronounced sensitivity for acetaminophen microdetection

Supplementary files

Article information

Article type
Paper
Submitted
18 Jul 2012
Accepted
24 Aug 2012
First published
24 Aug 2012

J. Mater. Chem., 2012,22, 21426-21433

Magnetic CMP microspheres: multifunctional poly(phenylene ethynylene) frameworks with covalently built-in Fe3O4 nanocrystals exhibiting pronounced sensitivity for acetaminophen microdetection

P. Zhang, J. Guo and C. Wang, J. Mater. Chem., 2012, 22, 21426 DOI: 10.1039/C2JM34725C

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