Abstract：
The high efficient surface-enhanced Raman scatterring (SERS) methods to detect thiacloprid and imidacloprid were established using ZIF-8-wrapped Ag nanoparticles (AgNPs) modified with β-cyclodextrin (β-CD). The substrate of ZIF-8/β-CD@AgNPs was characterized by ultraviolet visible spectra (UV-vis), thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The interaction between the substrate and thiacloprid/imidacloprid was also explored. The optimum measurement conditions were obtained by response surface model based on single-factor experiments. Enhancement factors (EFs) of thiacloprid and imidacloprid were respectively 2.29 × 106 and 2.60 × 106. A good linearity between the scattering intensity and the concentration of thiacloprid/imidacloprid within 3-1000 nmol L-1/6-400 nmol L-1 was established. The interference experiments indicated that the methods had good selectivity. The SERS methods were successfully applied to detect thiacloprid and imidacloprid in several vegetables samples. The recoveries ranged from 95.5 % to 105 % (n = 5). The detection limits (LODs) (S/N = 3) for thiacloprid and imidacloprid were 1.50 and 0.83 nmol L-1, respectively.
摘要：
利用β-环糊精(β-CD)修饰的ZIF-8包裹的Ag纳米粒子(AgNPs),建立了高效表面增强拉曼散射(SERS)检测噻虫啉和吡虫啉的方法。用紫外可见光谱(UV-vis)对ZIF-8/β-CD@AgNPs的底物进行了表征,热重分析（TGA），X射线衍射(XRD)透射电子显微镜(TEM)和扫描透射电子显微镜(STEM)。还探索了底物与噻虫啉/吡虫啉之间的相互作用。在单因素实验的基础上,通过响应面模型得到了最佳测量条件。噻虫啉和吡虫啉的增强因子（EF）分别为2.29×106和2.60×106。在3-1000nmolL-1/6-400nmolL-1范围内，散射强度与噻虫啉/吡虫啉的浓度之间建立了良好的线性关系。干扰实验表明，该方法具有良好的选择性。SERS方法成功应用于几种蔬菜样品中噻虫啉和吡虫啉的检测。回收率为95.5%~105%(n=5)。噻虫啉和吡虫啉的检出限（LODs）（S/N=3）分别为1.50和0.83nmolL-1。
