不同Ag壳厚度Au@Ag纳米粒子的调控制备表征及表面增强拉曼光谱的效应
发布时间：2019-05-05 18:36
【摘要】：采用化学还原法制备了以Au为核、包覆Ag的双金属核壳Au@Ag纳米粒子,并成功地用于表面增强拉曼光谱(SERS)分析测试。通过改变制备液中Ag/Au的量比来调控Ag壳包覆厚度。采用透射电子显微镜(TEM)和紫外-可见光谱仪(UV-Vis)对Au@Ag纳米粒子的构貌进行表征。TEM显示明显存在核壳结构,且Ag壳层随Ag/Au的量比的增加而逐渐变厚;UV-Vis表明随着Ag/Au的量比的增加,Au@Ag纳米粒子出现了Au核与Ag壳吸收峰的2个等离子体共振峰,同时伴随着Au峰的蓝移和Ag峰的红移。以双甲脒为分析物,考察了不同Ag/Au的量比时的Au@Ag纳米粒子的SERS活性。结果表明,SERS活性随Ag/Au的量比的增加先增大后减小,在6∶5时其SERS增强效应最佳,此时Ag壳厚度约为6 nm。以对巯基苯胺(4-ATP)、结晶紫(CV)和双甲脒为分析测试对象,对比了Au@Ag、Ag、Au 3种基底的SERS活性。结果表明,所制备的Au@Ag纳米粒子的SERS活性要明显优于单纯的Au、Ag纳米粒子。
[Abstract]:Bimetallic core-shell Au@Ag nanoparticles with Au as core and coated with Ag were prepared by chemical reduction method. The nanoparticles were successfully used in surface enhanced Raman spectroscopy (SERS) (SERS) analysis. The thickness of Ag shell was controlled by changing the ratio of Ag/Au in the preparation solution. The structure of Au@Ag nanoparticles was characterized by transmission electron microscopy (TEM) and ultraviolet-visible spectroscopy (UV-Vis). Tem showed that there was a core-shell structure obviously, and the Ag shell became thicker with the increase of the ratio of Ag/Au to Ag/Au. UV-Vis showed that with the increase of the ratio of Ag/Au, two plasmon resonance peaks of the absorption peaks of Au core and Ag shell appeared in the Au@Ag nanoparticles, accompanied by the blue shift of the Au peak and the red shift of the Ag peak. Using amitraz as analyte, the SERS activity of Au@Ag nanoparticles with different ratio of Ag/Au was investigated. The results showed that the activity of SERS first increased and then decreased with the increase of the volume ratio of Ag/Au, and the SERS enhancement effect was the best at 6: 5, and the thickness of Ag shell was about 6 nm.. Using p-mercaptoaniline (4-ATP), crystal violet (CV) and amitraz as analytical objects, the SERS activities of Au@Ag,Au substrates were compared. The results showed that the SERS activity of the prepared Au@Ag nanoparticles was obviously better than that of the pure Au,Ag nanoparticles.
【作者单位】： 浙江工业大学化学工程学院绿色化学合成技术国家重点实验室培育基地;
【基金】：浙江省公益性技术应用研究(分析测试)计划项目(2015C37068) 浙江省自然科学基金(LQ17B050002)资助项目~~
【分类号】：O657.37;TB383.1
本文编号：2469815
[Abstract]:Bimetallic core-shell Au@Ag nanoparticles with Au as core and coated with Ag were prepared by chemical reduction method. The nanoparticles were successfully used in surface enhanced Raman spectroscopy (SERS) (SERS) analysis. The thickness of Ag shell was controlled by changing the ratio of Ag/Au in the preparation solution. The structure of Au@Ag nanoparticles was characterized by transmission electron microscopy (TEM) and ultraviolet-visible spectroscopy (UV-Vis). Tem showed that there was a core-shell structure obviously, and the Ag shell became thicker with the increase of the ratio of Ag/Au to Ag/Au. UV-Vis showed that with the increase of the ratio of Ag/Au, two plasmon resonance peaks of the absorption peaks of Au core and Ag shell appeared in the Au@Ag nanoparticles, accompanied by the blue shift of the Au peak and the red shift of the Ag peak. Using amitraz as analyte, the SERS activity of Au@Ag nanoparticles with different ratio of Ag/Au was investigated. The results showed that the activity of SERS first increased and then decreased with the increase of the volume ratio of Ag/Au, and the SERS enhancement effect was the best at 6: 5, and the thickness of Ag shell was about 6 nm.. Using p-mercaptoaniline (4-ATP), crystal violet (CV) and amitraz as analytical objects, the SERS activities of Au@Ag,Au substrates were compared. The results showed that the SERS activity of the prepared Au@Ag nanoparticles was obviously better than that of the pure Au,Ag nanoparticles.
【作者单位】： 浙江工业大学化学工程学院绿色化学合成技术国家重点实验室培育基地;
【基金】：浙江省公益性技术应用研究(分析测试)计划项目(2015C37068) 浙江省自然科学基金(LQ17B050002)资助项目~~
【分类号】：O657.37;TB383.1
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