Magnetic-luminescent bifunctional nanosensorsElectronic supplementary information (ESI) available: Detailed experiments including the chemicals, characterization, structure of diazinon and its analogs, preparation of LaVO4:Eu3+ NPs, Fe3O4 NPs, and the copolymer. See DOI: 10.1039/c2jm32897f

• Main Authors: Ma, Yingxin, Li, Hao, Wang, Leyu
• Format: Journal Article
• Language: English
• Published: 21.08.2012
• ISSN: 0959-9428; 1364-5501
• DOI: 10.1039/c2jm32897f

Luminescent-magnetic multifunctional molecularly imprinted polymer (MIP) nanospheres containing luminescent LaVO 4 :Eu 3+ nanocrystals (NCs), magnetic Fe 3 O 4 nanoparticles (NPs), and the recognition sites of template organophosphate pesticides were successfully prepared via a facile and versatile bottom-up self-assembly strategy. Because of the photoluminescence quenching via diazinon molecules (templates) rebinding into the recognition cavities, these composite MIP nanospheres were successfully applied to the selective and direct luminescence detection of diazinon with the assistance of magnetic separation and concentration. The luminescence intensity was proportional to the concentration of diazinon in the range of 0.01-9.0 g mL 1 with the 3 limit of detection (LOD) of 7.1 ng mL 1 . This facile and versatile strategy for the MIP nanocomposites is very easy to be extended to other inorganic/organic multifunctional composite nanospheres and will find great potential application as chemical and biological sensors in aqueous media. Multifunctional molecularly imprinted polymer (MIP) nanospheres containing luminescent LaVO 4 :Eu 3+ nanocrystals, magnetic Fe 3 O 4 nanoparticles, and the recognition sites of template pesticides were successfully prepared via a facile and versatile bottom-up self-assembly approach and applied for the sensitive, selective and direct luminescence quantification of organophosphate pesticides in aqueous media with the assistance of magnetic separation.