Ag纳米粒子组装体的制备及表面增强拉曼效应  

Preparation and SERS properties of Ag nanoparticle assemblies

作　　者：杨超俊 樊双蓉 果冲 李燕子 曹艳珍[1] YANG Chao-jun;FAN Shuang-rong;GUO Chong;LI Yan-zi;CAO Yan-zhen(College of Chemistry and Chemical Engineering,Qiqihar University,Heilongjiang Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学化学与化学工程学院,黑龙江齐齐哈尔161006

出　　处：《齐齐哈尔大学学报（自然科学版）》2024年第6期61-66,94,共7页Journal of Qiqihar University(Natural Science Edition)

基　　金：黑龙江省大学生创新创业训练计划项目(202110232060);齐齐哈尔大学创新创业训练计划项目(x202210232050);黑龙江省教育厅基本科研业务专项面上项目(145209107)。

摘　　要：选用单宁酸为还原剂,硝酸银为银源,制备银纳米晶(约25 nm),并通过晶种生长法制备更大尺寸的银纳米粒子(约80 nm)。通过加入磷酸和柠檬酸钠,改变配体在纳米颗粒表面上的作用,实现了两种尺寸银纳米颗粒的自组装。采用紫外可见分光光度计对银纳米粒子及其组装体进行表征,结果表明,纳米粒子由原来的单峰出现明显的双峰。透射电镜结果表明,纳米粒子聚集成组装体。选用4-巯基苯甲酸为探针分子对银纳米粒子组装体SERS性能进行研究,结果表明,组装体表面增强拉曼效应明显增强。银纳米粒子组装体的最大SERS强度为银纳米粒子的25倍,主要由于Ag与Ag之间较强的电磁耦合效应。合成方法为设计热点纳米结构提供了新思路。Silver nanocrystals(about 25 nm)were prepared by using tannic acid as reducing agent and silver nitrate as silver source,and larger size silver nanoparticles(about 80 nm)were prepared by seed growth method.Self-assembly of silver nanoparticles with two sizes was realized by adding phosphoric acid and sodium citrate to change the action of ligands on the surface of nanoparticles.The silver nanoparticles and their assemblies were characterized by UV-visible spectrophotometer.The results show that the silver nanoparticles have obvious double peaks from the original single peak.The results of TEM show that nanoparticles aggregate into assemblies.The SERS properties of silver nanoparticle assemblies were studied by using 4-mercaptobenzoic acid as probe molecule.The experimental results show that the surface enhanced Raman properties of the assemblies are obviously enhanced.The maximum SERS intensity of Ag nanoparticle assembly is 25 times that of Ag nanoparticles,which may be due to the strong electromagnetic coupling effect between Ag and Ag.The synthesis method provides new insights for the design of hotspot nanostructures.

关 键 词：银纳米粒子 局域等离子共振 自组装 热点 SERS 

分 类 号：O657.37[理学—分析化学]