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Abstract: In this work, an inverse opal structural molecular imprinted photonic crystal (MIPC) sensor was developed and its efficiency on determination of four phthalate esters was investigated. The preparation of MIPC consisted of three steps. Firstly, an opal structure was obtained by vertical deposition self-assembly of monodisperse SiO2 nanospheres. Then, polymerization was performed through filling the interspace of SiO2 nanospheres with acrylamide (AM) and methacrylic acid (MAA) as co-monomer and diisononyl phthalate (DINP) as imprinting molecule. Finally, MIPC was obtained after removing SiO2 nanospheres and imprinting molecule from polymer. Scanning electron microscope showed that the MIPC possessed a highly ordered three-dimensional macroporous structure with abundant nanocavities. The recognition of target analytes could be directly transferred into readable optical signals through a change in Bragg diffraction of the ordered macropores array of MIPC. The results showed that the maximum Bragg diffraction peak red-shifted 20-40 nm when the concentration of phthalate esters changed from 1 × 10-5 mol/L to 1 mol/L. The response time of MIPC was within 6 min, and the MIPC could be used for at least 5 times due to the excellent stability of highly cross-linked polymer.
Template and target information: diisononyl phthalate, DINP
Author keywords: Photonic crystal, molecular imprinting, phthalate esters, Bragg diffraction