基于超疏水性紫竹梅叶的SERS研究

本文以表面超疏水性的紫竹梅叶片为基质, 用疏水浓缩效应制备了银纳米粒子基底。所制备的基底同样具有超疏水性。对探针分子R6G进行了表面增强拉曼散射光谱检测, 当R6G的浓度稀释到 5×10-11 mol/L时都有很明显的特征峰, 说明该基底具有很好的增强效果。另外对紫竹梅叶片的正反表面制备的基底的增强效果进行了研究, 发现其增强程度差别不大, 于是采用正面来制备基底进行进一步实验研究。利用所制备的基底对福美双残留进行检测, 发现其检测限度可达5×10-8 mol/L。低于国标福美双0.1 mg/kg(对应摩尔浓度为4.16×10-7 mol/L)的最大残留限量, 可作为福美双农药残留一种快速的检测方式。该基底制备简单, 在普通实验室就能完成, 有望作为农药残留一种快速有效的检测方法。

Abstract

In this paper, silver nanoparticle substrate was prepared by hydrophobic concentration effect based on super hydrophobicity of the leaf of Tradescantia pallida. The tradescantia-pallida-leaves substrate can enhance Raman signal well for the rhodamine 6G (R6G). the detection limit for R6G could reach 5×10-11mol/L, indicating that it had a good enhancement effect. In addition, comparative analysis was conducted on the SERS spectra of the substrate of front side and the back side of tradescantia-Pallida leaves, and it was found that there was little difference in the enhancement effect. So the front side was selected for the substrate to next experiment. The prepared substrate was used for the detection of Thiram residue, and the detection limit also reached 5×10-8mol/L. The detecting concentration well lower than the Latest national standard of maximum residue limit of 0.1mg/kg (about 4.16×10-7mol/L). The SERS substrates could be used for fast detection of Thiram residue. Furthermore the substrate is very easy to prepare and can be prospectively used as a rapid method for the detection of pesticide residues.

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姚为民, 张德清, 杨永安. 基于超疏水性紫竹梅叶的SERS研究[J]. 光散射学报, 2022, 34(3): 196. YAO Weimin, ZHANG Deqing, YANG Yongan. SERS Study Based on Super Hydrophobicity of Tradescantia Pallida Leaves[J]. The Journal of Light Scattering, 2022, 34(3): 196.

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