竖直取向MoS_(2)纳米片复合Ag基底的表面增强拉曼光谱效应及机制  

Surface enhanced Raman spectroscopy effect and mechanism of vertically oriented MoS_(2) nanosheet composite with Ag substrate

作　　者：戴硕 李振 张超 郁菁 赵晓菲 吴阳 满宝元[1] DAI Shuo;LI Zhen;ZHANG Chao;YU Jing;ZHAO Xiaofei;WU Yang;MAN Baoyuan(School of Physics and Electronics,Shandong Normal University,Ji’nan 250358,China)

机构地区：[1]山东师范大学物理与电子科学学院,济南250358

出　　处：《物理学报》2025年第5期195-202,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12174229,12474408);山东省泰山学者计划(批准号:tsqn202306152);山东省青创科技计划(批准号:2021KJ006);山东省自然科学基金(批准号:ZR2022YQ02)资助的课题.

摘　　要：结合金属和二维纳米材料的优点,研究人员提出了多种二维材料/金属复合结构作为表面增强拉曼光谱(SERS)基底,然而,复合结构中的二维纳米材料通常对总增强的作用较小.本文提出了一种竖直排列的二硫化钼(MoS2)纳米片,并将其与银纳米颗粒(Ag NPs)复合,制备MoS_(2)/Ag基底,用于SERS检测.竖直排列MoS_(2)纳米片可有效提高对分子的吸附,增强光吸收,提升电磁和化学双机制增强.实验结果表明,MoS_(2)/Ag基底表现出优异的SERS性能,其对罗丹明6G(R6G)分子的检测极限达到了10^(-12) mol/L,接近单分子检测水平,增强因子约为1.08×10^(9).同时该基底表现出优异的信号重现性,最终实现了对水产品中抗菌剂残留的超灵敏检测.Surface enhanced Raman spectroscopy(SERS)can provide rich molecular structure information about ultra-sensitive,non-destructive,and rapid detection,with accuracy down to the single-molecule level.It has been widely applied to physics,chemistry,biomedicine,environmental science,materials science and other fields.Combining the advantages of metals and two-dimensional(2D)nanomaterials,various 2D metal composite structures have been proposed for SERS.However,the contribution of 2D nanomaterials in Raman enhancement is often limited.In this work,vertically aligned MoS_(2) nanosheet composite with silver nanoparticles(Ag NPs)is proposed for SERS detection.Large-area vertically aligned MoS_(2) nanosheets,which are grown directly on molybdenum(Mo)foil by using hydrothermal method,can effectively enhance molecular adsorption,light absorption,and provide dual electromagnetic and chemical enhancement.Furthermore,annealing treatment of the MoS_(2) nanosheets significantly improves the efficiency of charge transfer between Ag NPs and MoS_(2),thereby increasing the chemical contribution to SERS.The results demonstrate that the annealed MoS_(2)/Ag substrate exhibits outstanding SERS performance,with a detection limit for R6G molecules as low as 10^(–12) mol/L,which is four orders of magnitude lower than that of the unannealed substrate.The enhancement factor(EF)is calculated to be approximately 1.08×10^(9),approaching the sensitivity required for single-molecule detection.Additionally,the substrate has high signal reproducibility at low concentrations,enabling ultra-sensitive detection of pesticide residues in aquatic products.

关 键 词：表面增强拉曼光谱 竖直排列 MoS_(2) 纳米片 银纳米颗粒 电荷转移 

分 类 号：TB33[一般工业技术—材料科学与工程] O657.37[理学—分析化学]