不同尺寸金纳米颗粒的制备及其SERS性能  

Preparation and SERS Properties of Au Nano-Particles with Different Sizes

作　　者：蒋浩 张霞[1] 李立松 李龙 杨文思 Jiang Hao;Zhang Xia;Li Lisong;Li Long;Yang Wensi(College of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201600,China)

机构地区：[1]上海工程技术大学材料与工程学院

出　　处：《微纳电子技术》2019年第2期107-110,139,共5页Micronanoelectronic Technology

基　　金：上海工程技术大学研究生创新项目(17KY0509)

摘　　要：为了研究不同尺寸的金纳米颗粒作为表面增强喇曼散射(SERS)活性基底对表面增强喇曼光谱的影响,采用氯金酸作为金源,柠檬酸三钠作为还原剂及保护剂,通过控制柠檬酸三钠的加入量合成了不同尺寸的金纳米颗粒。通过扫描电子显微镜(SEM)和紫外可见分光光度计(UV-vis)等技术对金纳米颗粒进行了性质表征。利用喇曼光谱仪,以罗丹明B作为被检测探针,研究了三种不同尺寸的金纳米颗粒(20、50和100 nm)喇曼增强效果。通过喇曼光谱图发现20和50 nm的金纳米颗粒具有较好的SERS效果。随后以20 nm的金纳米颗粒为SERS活性基底,对表面增强喇曼光谱检测罗丹明B的检测限进行了研究,可以使罗丹明检测限灵敏度达到10^-9 mol/L。In order to study the effects of Au nano-particles of different sizes as surface-enhanced Raman scattering(SERS)active substrates on SERS,the Au nano-particles of different sizes were synthesized by using chloroauric acid as Au sources and sodium citrate as reductants and protectants,and by controlling the added amounts of sodium citrate.The properties of the Au nano-particles were characterized by the scanning electron microscopy(SEM),ultraviolet-visible spectrophotometer(UV-vis)and so on.With rhodamine B as the test probe,the Raman enhancement effects of the Au nano-particles with three different sizes(i.e.20,50 and 100 nm)were studied by Raman spectroscopy.Through the Raman spectra,it is found that the Au nano-particles of 20 nm and 50 nm exhibit better SERS effects.Then the detection limit of rhodamine B of SERS was studied with20 nm Au nano-particles as the SERS active substrate,and the sensitivity of the detection limit of rhodamine B can reach 10^-9 mol/L.

关 键 词：金纳米颗粒 表面增强喇曼散射(SERS) 罗丹明B 检测限 SERS基底 

分 类 号：TB383[一般工业技术—材料科学与工程]