【摘要】：采用化學(xué)還原法制備了以Au為核、包覆Ag的雙金屬核殼Au@Ag納米粒子,并成功地用于表面增強(qiáng)拉曼光譜(SERS)分析測試。通過改變制備液中Ag/Au的量比來調(diào)控Ag殼包覆厚度。采用透射電子顯微鏡(TEM)和紫外-可見光譜儀(UV-Vis)對Au@Ag納米粒子的構(gòu)貌進(jìn)行表征。TEM顯示明顯存在核殼結(jié)構(gòu),且Ag殼層隨Ag/Au的量比的增加而逐漸變厚;UV-Vis表明隨著Ag/Au的量比的增加,Au@Ag納米粒子出現(xiàn)了Au核與Ag殼吸收峰的2個等離子體共振峰,同時伴隨著Au峰的藍(lán)移和Ag峰的紅移。以雙甲脒為分析物,考察了不同Ag/Au的量比時的Au@Ag納米粒子的SERS活性。結(jié)果表明,SERS活性隨Ag/Au的量比的增加先增大后減小,在6∶5時其SERS增強(qiáng)效應(yīng)最佳,此時Ag殼厚度約為6 nm。以對巰基苯胺(4-ATP)、結(jié)晶紫(CV)和雙甲脒為分析測試對象,對比了Au@Ag、Ag、Au 3種基底的SERS活性。結(jié)果表明,所制備的Au@Ag納米粒子的SERS活性要明顯優(yōu)于單純的Au、Ag納米粒子。
[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.
【作者單位】： 浙江工業(yè)大學(xué)化學(xué)工程學(xué)院綠色化學(xué)合成技術(shù)國家重點實驗室培育基地;
【基金】：浙江省公益性技術(shù)應(yīng)用研究(分析測試)計劃項目(2015C37068) 浙江省自然科學(xué)基金(LQ17B050002)資助項目~~
【分類號】：O657.37;TB383.1

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