Citation: ZHANG Qi, ZHANG Hong, ZHOU Qiang, XU Yan-Shuo, WANG Yan-Hong. Preparation and Application of Methomyl Molecularly Imprinted Photonic Crystal Sensor[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(6): 883-889. doi: 10.19756/j.issn.0253-3820.181718 shu

Preparation and Application of Methomyl Molecularly Imprinted Photonic Crystal Sensor

ZHANG Qi ^1,2, ,
ZHANG Hong ^1,2 ,
ZHOU Qiang ¹ ,
XU Yan-Shuo ¹ ,
WANG Yan-Hong ¹

1.
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 16 November 2018

Fund Project: This work was supported by the National Key R&D Program of China (No. 2016YFD0401201) and the Shenyang Science and Technology Program (Nos. 17-191-9-00, F16-107-4-00)

A novel sensing material with high sensitivity and specificity was developed for the detection of methomyl by combining photonic crystal technique with molecularly imprinting technique which was named molecularly imprinted photonic crystal (MIPC). MIPC was prepared by thermal polymerization with SiO₂ microspheres array as pore-forming templates, methomyl as imprinting molecule, methacrylic acid and acrylamide as monomers and ethylene dimethacrylate as cross-linker, followed by chemical removal of SiO₂ microspheres and imprinting molecules. The morphology of the polymer films was characterized by scanning electron microscopy (SEM). The results showed that a three-dimensional interconnected macroporous array with a typical face-centered cubic structure was formed in the film. The response of the MIPC to methomyl solution was studied by measuring the change of the position of the reflection peak. The results showed that the MIPC film had good specificity to methomyl. When the concentration of methomyl solution changed from 0 to 0.02 g/L, the reflection peak shifted from 533 nm to 589 nm, the apparent color changed from green to orange-red, and the response time was only 13 min. There is no significant peak shift when measuring the analog of methomyl. The response of the MIPC to methomyl in biological samples was tested. When the MIPC was immersed in the matrix solution of cabbage samples with 0.002, 0.02 and 0.2 mg/L of methomyl, the offsets of MIPC reflection peak were 28, 34 and 42 nm, respectively. The results show that the sensor still maintains high selectivity and high sensitivity in the presence of complex matrix interference.
- Photonic crystal,
- Molecular imprinting,
- Sensor,
- Methomyl
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