Detection and quantitative analysis of carbendazim herbicide on Ag nanoparticles via surface-enhanced Raman scattering
Detection and quantitative analysis of carbendazim herbicide on Ag nanoparticles via surface-enhanced Raman scattering
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DOI：
10.1002/jrs.4737
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发表时间：
2015-11-01
影响因子：
2.5
通讯作者：
Leopoldo Constantino, Carlos Jose
中科院分区：
文献类型：
--
作者：
Furini, Leonardo Negri;Sanchez-Cortes, Santiago;Leopoldo Constantino, Carlos Jose
多菌灵（MBC）是一种广泛应用于农业的杀菌剂，人们对这种杀菌剂可能造成的健康风险表示严重关切。在这里，我们探索了表面增强拉曼散射（SERS）的超灵敏检测。首先，为了获得最大的SERS信号，靶分子在金属表面的吸附是必不可少的。因此，我们在不同的实验条件下，如不同的纳米颗粒合成方法、不同的激发波长、不同的杀菌剂浓度等，研究了SERS对MBC在纳米颗粒表面的吸附，目的是检测低浓度的MBC。用柠檬酸还原银、金和羟胺还原银三种胶体纳米粒子进行了实验。然而，主要是银胶体对MBC的SERS检测效率较高。此外，利用MBC拉曼光谱和表面配合物拉曼光谱的理论计算，有助于理解MBC与Ag相互作用的机理。紫外-可见吸收光谱显示，在MBC的存在下，银胶体的等离子体共振向红色偏移。版权所有：John Wiley & Sons， Ltd
Carbendazim(MBC) is a fungicide widely used in agriculture, and there are serious concerns regarding the health risks that could be caused by this fungicide. Here, we explore its ultrasensitive detection by surface-enhanced Raman scattering (SERS). First, to obtain maximum SERS signal, the adsorption of the target molecule onto metallic surface is essential. Therefore, we study the adsorption of the MBC onto the nanoparticle surface by SERS under different experimental conditions, such as different synthesis methods of nanoparticle, variable excitation wavelength, and fungicide concentration with the aim to detect MBC at low concentrations. Experiments are carried out with three kinds of colloidal nanoparticles: Ag and Au reduced by citrate and Ag reduced by hydroxylamine. However, mainly Ag colloids are highly efficient in the SERS detection of MBC. In addition, theoretical calculations of MBC Raman spectrum and that of the surface complex are used to help with the understanding the mechanisms responsible for the interaction between MBC and Ag. Ultraviolet-visible absorption spectroscopy showed displacement to the red of the plasmon resonance of Ag colloid in the presence of MBC. Copyright (C) 2015 John Wiley & Sons, Ltd.