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3D silver nanoparticles with multilayer graphene oxide as a spacer for surface enhanced Raman spectroscopy analysis†
Nanoscale ( IF 6.7 ) Pub Date : 2018-02-24 00:00:00 , DOI: 10.1039/c7nr09276h
Zhen Li 1, 2, 3, 4 , Shouzhen Jiang 1, 2, 3, 4 , Yanyan Huo 1, 2, 3, 4 , Tingyin Ning 1, 2, 3, 4 , Aihua Liu 1, 2, 3, 4 , Chao Zhang 1, 2, 3, 4 , Yuan He 1, 2, 3, 4 , Minghong Wang 1, 2, 3, 4 , Chonghui Li 1, 2, 3, 4 , Baoyuan Man 1, 2, 3, 4
Affiliation  

We report a three-dimensional (3D) SERS substrate with different numbers of silver nanoparticle (Ag NP) layers using multilayer graphene oxide (GO) as a spacer. The SERS performance of the 3D nanostructure was investigated and it was found that the SERS effect increased as the number of Ag NP layers increased, and showed almost no change for more than four layers. We found that the SERS performance of the 3D nanostructures can be mainly attributed to the topmost hot spots which are closely related to the Ag NP layers in the 3D nanostructure. Furthermore, we explored 3D nanostructures with different Ag NP layers using the finite difference time domain method (FDTD). The 3D SERS substrates also exhibit excellent detection capability. The limit of detection (LOD) was calculated down to 10−15 M for R6G and 10−12 M for CV. In addition, the reproducibility of the 3D SERS substrate was attributed obviously to the increasing number of Ag NP layers. Based on these promising results, the highly sensitive detection of molecules such as malachite green was demonstrated for food safety inspection.

中文翻译:

具有多层氧化石墨烯作为间隔物的3D银纳米颗粒,用于表面增强拉曼光谱分析

我们报告了三维(3D)SERS衬底,其中使用多层氧化石墨烯(GO)作为间隔物,具有不同数量的银纳米颗粒(Ag NP)层。研究了3D纳米结构的SERS性能,发现随着Ag NP层数的增加,SERS效应也增加,并且超过四层几乎没有变化。我们发现3D纳米结构的SERS性能主要归因于与3D纳米结构中的Ag NP层密切相关的最顶部的热点。此外,我们使用时差有限差分法(FDTD)探索了具有不同Ag NP层的3D纳米结构。3D SERS基板还具有出色的检测能力。R6G和10的检测下限(LOD)可以低至10 -15 M-12 M代表的简历。此外,3D SERS基板的可重复性显然归因于Ag NP层数量的增加。基于这些令人鼓舞的结果,对诸如孔雀石绿之类的分子进行了高度灵敏的检测,证明了其可用于食品安全检查。
更新日期:2018-02-24
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