二维Mxenes-Ag微纳复合膜表面增强拉曼研究  

Two-Dimensional Mxenes-Ag Micro-Nano Mixed Film for Surface-Enhanced Raman Research

作　　者：刘安平[1,2] 陈照贤 王至恒 姚凯彬 方亮 黄映洲 Liu Anping;Chen Zhaoxian;Wang Zhiheng;Fang Liang;Huang Yingzhou(National Demonstration Center for Experimental Physics Education,College of Physics,Chongqing University,Chongqing 401331,China;Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials,Chongqing 401331,China)

机构地区：[1]重庆大学物理学院物理国家级实验教学示范中心,重庆401331 [2]重庆市软凝聚态物理及智能材料研究重点实验室,重庆401331

出　　处：《稀有金属》2022年第8期989-997,共9页Chinese Journal of Rare Metals

基　　金：重庆市高等教育教学改革研究重点项目(212005);国家自然科学基金面上项目(11974067)资助。

摘　　要：作为新兴的超高灵敏检测技术,表面增强拉曼光谱(SERS)在环境、医药、食品、生理检测等多个领域有巨大的应用前景。由于该技术的检测灵敏度完全依赖于等离激元微纳结构的理化特性,其增强基底的设计和制备成为该领域的研究关键和热点。本文采用二维MXenesAg微纳复合膜作为增强基底,并通过优化Ag纳米颗粒的大小和分布来系统研究其SERS检测性能。相比传统的SERS增强基底,二维MXenes-Ag微纳复合膜具有更大的比表面积和更多的增强位点,MXenes作为吸附层的同时也可以为拉曼检测分子提供电子,使得检测分子发生电荷转移,在电荷转移的过程中会增强拉曼信号的强度,更容易吸附检测分子以获得更大的SERS增强。研究结果表明,该基底对典型SERS探针分子耐尔蓝(NB)与亚甲基蓝(MB)的检测限分别为1×10^(-11)和1×10^(-12)mol·L^(-1)。此外,为分析该SERS增强基底的应用潜力,其增强SERS信号的重现性和均匀性也进行了探究,典型环境污染物福美双和食品添加剂三聚氰胺的检测限为10和100μg·ml^(-1)。本研究成果拓展了SERS增强基底的研究领域,对SERS技术的广泛应用提供了技术支撑。Combined with thin film technology,surface enhanced Raman spectroscopy(SERS)exhibited huge application prospective in the sensitive online detection.SERS was chiefly originated from the local surface plasmon resonance(LSPR).Noble metal nanoparticles(Au,Ag and Cu)could remarkably enhance Raman signals of analytes located at or very close to metallic nanostructures by some orders of magnitude.In addition,SERS was an ultra-sensitive sensing technique and an area of research.As we all know,the enhancement was mainly due to the intensification of the local electromagnetic(EM)fields which stimulated the LSPR.The EM enhancement mechanism was exactly connected with the plasmonic properties of the substrates and the dielectric functions comminated with the nanostructure composition,morphology,scope and local dielectric environment.Compared with the EM mechanism,chemical enhancement(CM)was the amplification of SERS signal caused by the charge resonance transfer between SERS substrate and probe molecule.As popular series of two-dimensional(2D)materials,MXenes were transitional metal carbides or nitrides which had the great electron conductivity and an effortlessly manufacturable process.MXenes could be prepared by etching“Al”layers.The precursor had been dealt with an aqueous solution containing fluoride ions,such as a mixture of lithium fluoride and hydrochloric acid.Since the detection sensitivity of this technology had completely depended on the physicochemical properties of plasmonic micro-nana structures.The design and fabrication of the substrate had become the key and hot pots research in this field.In this paper,2D Mxenes Ag micro nano composite film was used as reinforcing substrate.SERS signal intensity was related to the molecular concentration,nanoparticles size and“hot spot”density.Because MXene substrate decorated with Ag nanoparticles(NPs)had many layers,and this would generate numerous hot-spots.Therefore,the SERS detection performance was systematically studied by nanoparticles size and distribution

关 键 词：MXenes 表面增强拉曼光谱(SERS) 表面等离激元 二维微纳膜 

分 类 号：O437[机械工程—光学工程]