Use of Graphene and Gold Nanorods as Substrates for the Detection of Pesticides by Surface Enhanced Raman Spectroscopy
Use of Graphene and Gold Nanorods as Substrates for the Detection of Pesticides by Surface Enhanced Raman Spectroscopy
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DOI：
10.1021/jf5036417
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发表时间：
2014-10-29
影响因子：
6.1
通讯作者：
Lin, Mengshi
中科院分区：
文献类型：
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作者：
Nguyen, Trang H. D.;Zhang, Zhong;Lin, Mengshi
本研究旨在以金纳米棒和石墨烯为关键材料制备高性能的基底，用于农药的表面增强拉曼光谱（Sers）检测。选择了三种类型的农药（甲基吖嗪啶、西维因和灭多威）。由于金纳米棒的表面等离子体共振很容易调谐到拉曼光谱的激光激发波长，因此金纳米棒具有很大的用作Sers基底的潜力。石墨烯是一种很有前途的纳米材料，可用于支撑金属纳米结构。制备了石墨烯-金膜-金纳米棒（G-Au-AuNR）、金膜-金纳米棒（Au-AuNR）和石墨烯-金纳米棒（G-AuNR）三种新型Sers基底。结果表明，G-Au-AuNR基底表现出最强的拉曼信号的选定的农药，其次是Au-AuNR基底。G-AuNR表现出最弱的拉曼信号，并且没有得到分析物的特征光谱特征。甲偏最小二乘法被用来开发定量模型分析的光谱数据（R = 0.94，0.87，和0.86为azinesulf-methyl，西维因，和二甲双胍，分别）。G-Au-AuNRs底物能够以百万分之一的水平检测所有三种类型的农药，检测限分别约为5，5和9 ppm的azinesulf-methyl，西维因和杀虫双。这些结果表明，结合金纳米棒和石墨烯在制造用于Sers应用的灵敏、轻质和柔性基底以提高食品安全性方面具有巨大的潜力。
This study aimed to use gold nanorods and graphene as key materials to fabricate high-performance substrates for the detection of pesticides by surface enhanced Raman spectroscopy (SERS). Three types of pesticides (azinphos-methyl, carbaryl, and phosmet) were selected. Gold nanorods have great potential to be used as a SERS substrate because it is easy to tune the surface plasmon resonance of the nanorods to the laser excitation wavelength of Raman spectroscopy. Graphene is a promising nanoscale material that can be used for supporting metal nanostructures. Three types of novel SERS substrates were fabricated, including graphene-gold film-gold nanorod (G-Au-AuNR) substrate, gold film-gold nanorod (Au-AuNR) substrate, and graphene coupled with gold nanorods (G-AuNR). The results demonstrate that G-Au-AuNR substrates exhibited the strongest Raman signals of the selected pesticides, followed by the Au-AuNR substrates. G-AuNR exhibited the weakest Raman signals, and no characteristic spectral features of the analytes were obtained. A partial least-squares method was used to develop quantitative models for the analysis of spectral data (R = 0.94, 0.87, and 0.86 for azinphos-methyl, carbaryl, and phosmet, respectively). The G-Au-AuNRs substrate was able to detect all three types of pesticides at the parts per million level with limits of detection at around 5, 5, and 9 ppm for azinphos-methyl, carbaryl, and phosmet, respectively. These results indicate that combining gold nanorods and graphene has great potential in the fabrication of sensitive, lightweight, and flexible substrates for SERS applications to improve food safety.