A novel sensor was developed based on the combination of photonic crystal templating and molecular imprinting technique (MIT) for the detection of simetryn in tobacco samples. The molecularly imprinted photonic crystal hydrogels (MIPHs) was prepared with methacrylic acid (MAA) as monomers, ethylene glycol dimethylacrylate (EGDMA) as cross-linkers, simetryn as imprinting template molecules and polystyrene (PS) microspheres as photonic crystal template. The ordered three-dimensional macro-porous structure of MIPHs with simetryn imprinting template can generate Bragg diffraction, showing a bright structural color. The results show that the MIPHs have high selectivity and excellent sensing performance and can be used for the detection of simetryn from actual tobacco samples. Among the four triazine herbicides with similar structure, MIPHs only produced obvious Bragg diffraction peak wavelength change to simetryn, and MIPHs have good recoverability with four cycle times. When the concentration of simetryn in the actual tobacco increased from 0 to 1.0 μg/mL, the wavelength was red-shifted from 457 nm to 499 nm, which was in the blue and green visible light wavelength range. This new sensor is expected to be used to directly detect pesticide residues in tobacco.

基于光子晶体模板和分子印迹技术 (MIT) 相结合开发了一种新型传感器，用于检测烟草样品中的 simetryn。以甲基丙烯酸（MAA）为单体，乙二醇二甲基丙烯酸酯（EGDMA）为交联剂，simetern为印迹模板分子，聚苯乙烯（PS）微球为光子晶体模板，制备了分子印迹光子晶体水凝胶（MIPHs）。带有simetryn印迹模板的MIPHs有序的三维大孔结构可以产生布拉格衍射，呈现出明亮的结构颜色。结果表明，MIPHs具有高选择性和优异的传感性能，可用于实际烟草样品中simetryn的检测。在结构相似的四种三嗪类除草剂中，MIPHs仅对simetern产生明显的Bragg衍射峰波长变化，并且MIPHs在4个循环次数下具有良好的可恢复性。当实际烟草中西美美的浓度从 0 增加到 1.0 μg/mL 时，波长从 457 nm 红移至 499 nm，处于蓝色和绿色可见光波长范围内。这种新型传感器有望用于直接检测烟草中的农药残留。