Zheng Jieshuang, Yan Jinghui, Qi Xiaohua, Zhang Xiaohua, Li Yunhui, Zou Mingqiang
Changchun University of Science and Technology, Changchun 130022, China.
Chinese Academy of Inspection and Quarantine, Beijing 100123, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Apr 15;251:119396. doi: 10.1016/j.saa.2020.119396. Epub 2020 Dec 31.
Recently, in the research of Surface-enhanced Raman scattering (SERS) technology, it is found that the preparation of enhanced substrate is particularly important. In this work, the most commonly used methods were used to synthesize AgNPs and MIL-101(Fe), and AgNPs/MIL-101(Fe) nanocomposite was obtained through self-assembly of the two substances. Four different probe molecules were detected with the self-assembled substrate and compared with the results of same probe molecules with AgNPs and MIL-101(Fe) as SERS substrate separately, it was found that AgNPs/ MIL-101 (Fe) nanocomposites had a strong enhancing effect as SERS substrate. The Enhancement Factor (EF) value of 10 mol/L Rhodamine 6G (R6G) was calculated as 2.09 × 10, and the Raman intensities of the peak relative standard deviation (RSD) of R6G Raman attribution was calculated as 7.55%. The time stability of the material was studied and it was found that the reduced Raman signal and poor reproducibility were due to the AgNPs placement time. AgNPs/ MIL-101 (Fe) nanocomposites were used as SERS substrate to detect Paraquat with a minimum concentration of 10 mol/L. The signal values of Paraquat Raman detected at 10 mol/L in different pH environments were relatively stable.
最近，在表面增强拉曼散射（SERS）技术的研究中发现，增强基底的制备尤为重要。在这项工作中，采用最常用的方法合成了AgNPs和MIL-101(Fe)，并通过两种物质的自组装得到了AgNPs/MIL-101(Fe)纳米复合材料。用自组装基底检测了四种不同的探针分子，并分别与以AgNPs和MIL-101(Fe)作为SERS基底的相同探针分子的检测结果进行比较，发现AgNPs/MIL-101(Fe)纳米复合材料作为SERS基底具有很强的增强效果。计算出10 mol/L罗丹明6G（R6G）的增强因子（EF）值为2.09×10，R6G拉曼归属峰的拉曼强度相对标准偏差（RSD）为7.55%。研究了该材料的时间稳定性，发现拉曼信号降低和重现性差是由于AgNPs的放置时间所致。将AgNPs/MIL-101(Fe)纳米复合材料用作SERS基底检测百草枯，最低检测浓度为10 mol/L。在不同pH环境下，10 mol/L百草枯拉曼检测的信号值相对稳定。
