一种通用的合成多刺状的银@金和银@金@银纳米结构的方法用于提高表面增强拉曼的活性  

A General Method to Prepare Spinous Silver@Gold or Silver@Gold@Silver Nanostructures with Improved Surface Enhanced Raman Scattering Activity

作　　者：许富刚[1] 谢施 任春锦 冯亚楠[1] 曹仁涛[1] 

机构地区：[1]江西师范大学化学化工学院,江西南昌330022

出　　处：《吉林师范大学学报（自然科学版）》2017年第1期19-27,共9页Journal of Jilin Normal University:Natural Science Edition

基　　金：江西省自然科学基金项目(20132BAB213012)

摘　　要：利用简单的湿化学方法制备出多刺状的银@金和银@金@银纳米结构作为高活性的表面增强拉曼散射(SERS)基底.使用不同形状的银纳米结构(纳米球、纳米棒和纳米片)作为前躯体来合成银@金和银@金@银纳米结构,其形状相似但具有不同刺状表面的两种纳米材料.它们的形貌、组成、光学性质和SERS活性分别用过扫描电镜、元素分析、紫外可见吸收光谱和拉曼光谱进行表征.这些刺状结构在可见光区域具有宽的较强的吸收峰且具有较高的SERS活性.用结晶紫(CV)作为探针分子,所有不同形貌的刺状银@金@银复合物比相应银@金结构的SRES信号大大提高.在这些纳米材料中,以纳米球为前躯体的刺状的银@金@银纳米球具有最强的增强能力,用SERS来检测CV时的最低检测浓度为1×10-10mol/L.该合成方法具有成本低廉,操作简单,产率高等优点,可以用来制备各种刺状的金、银结构,在SERS、催化、光学等等领域具有更好的应用前景.A general,robust but simple wet-chemical approach is proposed to prepare spinous silver@gold （Ag@Au） or silver@gold@silver （Ag@Au@Ag） nanostructures as highly active substrates for surface enhanced Raman scattering（SERS）.Using silver nanostructures with different shapes （nanospheres,nanorods,or nanosheets） as precursors,Ag@Au or Ag@Au@Ag with similar shape to precursors but with a spiny surface can be facilely prepared.The morphology,component,optical properties and SERS activity of these spiny products were investigated by SEM,EDS,UV-vis absorption,and Raman spectra.These spinous products display a broad and enhanced absorption spectrum in the visible light region,and a high enhancement ability as SERS substrates.For probing crystal violet （CV）,all spiny Ag@Au@Ag with different shapes display much stronger SERS signal than those of corresponding silver precursors.Among these products,the spiny Ag@Au@Ag with spherical shape shows the highest enhancement ability,on which the lowest SERS detectable concentration of CV can be down to 0.1 nmol/L.The proposed method with low cost,simple operation,and high-yield can be used to prepare various spinous gold/silver structures,which have promising applications in SERS,catalysis,optics and so on.

关 键 词：刺状纳米结构 贵金属纳米材料 表面增强拉曼 增强基底 染料分子 

分 类 号：O621.14[理学—有机化学]