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Reference type: Journal
Authors: Guan GJ, Wang SS, Zhou HB, Zhang K, Liu RY, Mei QS, Wang SH, Zhang ZP
Article Title: Molecularly imprinted polypyrrole nanonecklaces for detection of herbicide through molecular recognition-amplifying current response.
Publication date: 2011
Journal: Analytica Chimica Acta
Volume: 702
Issue: (2)
Page numbers: 239-246.
DOI: 10.1016/j.aca.2011.06.047
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0003267011009056

Abstract: Molecularly imprinted polypyrrole (PPy) nanonecklaces were facilely synthesized through a two-step oxidative polymerization route for the amperometric detection of non-electrochemically active herbicide. It has been demonstrated that dissolved oxygen can preoxidize pyrrole to form PPy oligomer bundles, which further self-assemble into necklace-like micelles in the presence of cetyltrimethylammonium bromide. Subsequently, these microstructures were immediately gelled through quick polymerization of residual pyrrole monomers, leading to the formation of PPy nanonecklaces. Meanwhile, herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was synchronously imprinted into the formed PPy and highly dense imprinted sites were generated in PPy nanonecklaces because the necklace-like structure with microgaps/pores provides the facile and complete removal of templates. The imprinted nanonecklaces exhibit the high capacity and fast kinetics to uptake 2,4-D molecules, and produce a imprinting factor of ~4.2. Importantly, the recognition and binding to 2,4-D significantly amplify the current response by a factor of 8 times in amperometric measurements, providing a sensitive detection of 2,4-D. The molecular imprinting strategy opens a novel avenue to the direct detection of non-electrochemically active species in a more convenient, simpler and cheaper way than the traditional competition-displacing approaches
Template and target information: 2,4-dichlorophenoxyacetic acid, 2,4-D
Author keywords: molecularly imprinted, polypyrrole, electrochemical detection, herbicide

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