AuNRs@ZIF-8的制备及其表面增强拉曼散射光谱研究  

The preparation and surface enhanced Raman Scattering spectroscopy of AuNRs@ZIF-8

作　　者：袁阳涛 米佳佳[1] 王曼 罗媛媛 段国韬 石建平[1] Yuan Yangtao;Mi Jiajia;Wang Man;Luo Yuanyuan;Duan Guotao;Shi Jianping(College of Physics and Electronic Information,Anhui Normal University,Wuhu,Anhui 241000,China;Institute of Solid State Physics,Hefei Institute of Physical Science,CAS,Heifei,Anhui 230031,China;School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]安徽师范大学物理与电子信息学院,安徽芜湖241002 [2]中国科学院合肥物质科学研究院固体物理研究所,安徽合肥230031 [3]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《光电工程》2023年第6期87-94,共8页Opto-Electronic Engineering

基　　金：国家自然科学基金(61775002);安徽省自然科学基金(2108085MA23,808235830016)支持。

摘　　要：表面增强拉曼光谱(Surface enhanced Raman spectroscopy,SERS)是一种分子光谱,具有快速、高灵敏和指纹识别的特性,在分析化学、生物医学等领域有着重要的应用。然而,在溶液样品中一些检测分子很难被SERS基底所吸附,导致分子拉曼信号增强困难。为此,本文提出了一种ZIF-8材料包覆金纳米棒(AuNRs)的核壳结构(AuNRs@ZIF-8)来实现拉曼信号增强,既可利用金纳米颗粒的表面等离激元增强特性,又可利用ZIF-8这种多孔MOFs材料的吸附性能,从而实现溶液样品的高灵敏拉曼检测。我们首先采用晶种法制备了均一性良好的AuNRs,然后对其进行聚乙烯吡咯烷酮(PVP)修饰,最后加入金属有机框架ZIF-8前驱体,得到AuNRs@ZIF-8核壳纳米结构。该结构对罗丹明(R6G)的SERS检测灵敏度很高,检测限可低至10^(-9) mol/L,并且线性关系和均一性均良好。此外,我们通过测试该结构吸收R6G前后的UV-Vis吸收光谱进一步证实了核壳纳米结构的生成和对目标分子的有效吸附。Surface enhanced Raman spectroscopy(SERS)is a kind of molecular spectrum,which has the characteristics of rapidity,high sensitivity and fingerprint recognition,and has important applications in analytical chemistry,biomedicine and other fields.However,some detection molecules in the solution sample are difficult to be adsorbed by the SERS substrate,resulting in difficulty in enhancing the Raman signal of molecular.To this end,this paper proposes a core-shell structure(AuNRs@ZIF-8)of ZIF-8 material coated gold nanorods(AuNRs)to achieve Raman signal enhancement.Both the surface plasmon enhancement characteristics of the gold nanoparticles and the adsorption properties of ZIF-8,a porous MOFs material,can be used to realize highly sensitive Raman detection of the solution samples.We first prepare the well-homogeneous AuNRs by seed crystallization method,then modify them with polyvinylpyrrolidone(PVP),and finally add the metal-organic framework ZIF-8 precursor to obtain the AuNRs@ZIF-8 Core-shell nanostructures.The structure has high sensitivity to the SERS detection of rhodamine(R6G),the detection limit can be as low as 10^(−9) M,and the linear relationship and homogeneity are good.In addition,we further confirm the formation of the core-shell nanostructures and effective adsorption of the target molecules by testing the UV-Vis absorption spectra of the structure before and after R6G absorption.

关 键 词：SERS AuNRs@ZIF-8 核壳纳米结构 光吸收 吸附性 

分 类 号：O657.37[理学—分析化学] TB383[理学—化学]