Key Laboratory of Horticultural Plant Biology, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, 430070, Wuhan, China.
College of Optical and Electronic Technology, China Jiliang University, 310018, Hangzhou, China.
J Hazard Mater. 2020 Jan 15;382:121023. doi: 10.1016/j.jhazmat.2019.121023. Epub 2019 Aug 17.
Pesticide residues pose a great threat to human health, and it is an urgent matter to realize fast and accurate detection of pesticide. SERS (Surface Enhanced Raman Scattering), as a nondestructive detection technology, performs a prominent role in fast detection field due to the strong surface plasmon resonance from short range effect between analyte and nanoparticle. Therefore, in order to solve the incompatibility between organochlorine pesticides molecules and noble metal nanoparticles, this paper proposed a concept of "bridge" substances acting as an interconnect function role to achieve a binding model (object-binder-metal (OBM)) and developed a droplet concentration method to enhance Raman signals. Both combination mode of pesticide molecules to bridge molecules and energy transfer of SERS experiment may relate to the compound ring according to the changes of peaks based on surface plasmon resonance. The selectivity and stability of different bridge substances interacting with pesticides molecules were illumined via binding energy of these two substances obtained by DFT calculations. A droplet can capture nanoparticles and analytes, which is conducive to SERS performance. Chloride ions in the solution contribute to rearrangement of nanoparticles and can validly promote surface activation of Ag nanoparticles to improve energy transfer efficiency of plasma resonance, resulting in superior SERS effect.
农药残留对人类健康构成了巨大威胁，实现农药的快速准确检测是当务之急。表面增强拉曼散射（SERS）作为一种非破坏性检测技术，由于分析物与纳米颗粒之间短程效应产生的强表面等离子体共振，在快速检测领域发挥着重要作用。因此，为了解决有机氯农药分子与贵金属纳米颗粒之间的不兼容性，本文提出了“桥梁”物质的概念，作为一种互联功能，以实现结合模型（目标-桥接物-金属（OBM）），并开发了液滴浓缩方法来增强拉曼信号。根据表面等离子体共振的变化，农药分子与桥接分子的结合方式和 SERS 实验的能量转移可能与化合物环有关。通过 DFT 计算得到的这两种物质的结合能，研究了不同桥接物质与农药分子相互作用的选择性和稳定性。液滴可以捕获纳米颗粒和分析物，有利于 SERS 性能。溶液中的氯离子有助于纳米颗粒的重排，并能有效地促进 Ag 纳米颗粒的表面活化，提高等离子体共振的能量转移效率，从而产生优越的 SERS 效应。
