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首页> 外文期刊>Scientific reports. >Graphene Dendrimer-stabilized silver nanoparticles for detection of methimazole using Surface-enhanced Raman scattering with computational assignment
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Graphene Dendrimer-stabilized silver nanoparticles for detection of methimazole using Surface-enhanced Raman scattering with computational assignment

机译：石墨烯树枝状聚合物稳定的银纳米粒子用于使用表面增强拉曼散射进行甲咪唑与计算分配检测

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摘要

Graphene functionalized with polyamidoamine dendrimer, decorated with silver nanoparticles (G-D-Ag), was synthesized and evaluated as a substrate with surface-enhanced Raman scattering (SERS) for methimazole (MTZ) detection. Sodium borohydride was used as a reducing agent to cultivate silver nanoparticles on the dendrimer. The obtained G-D-Ag was characterized by using UV-vis spectroscopy, scanning electron microscope (SEM), high-resolution transmission electron microscope (TEM), Fourier-transformed infrared (FT-IR) and Raman spectroscopy. The SEM image indicated the successful formation of the G-D-Ag. The behavior of MTZ on the G-D-Ag as a reliable and robust substrate was investigated by SERS, which indicated mostly a chemical interaction between G-D-Ag and MTZ. The bands of the MTZ normal spectra at 1538, 1463, 1342, 1278, 1156, 1092, 1016, 600, 525 and 410?cm(-1) were enhanced due to the SERS effect. Correlations between the logarithmical scale of MTZ concentrations and SERS signal intensities were established, and a low detection limit of 1.43?×?10(-12) M was successfully obtained. The density functional theory (DFT) approach was utilized to provide reliable assignment of the key Raman bands.
机译：用用银纳米粒子（G-D-Ag）装饰的聚酰胺胺树枝状聚合物官能化的石墨烯，并作为具有表面增强拉曼散射（SERS）的基材进行评价，用于甲基唑（MTZ）检测。硼氢化钠用作还原剂，以在树枝状聚合物上培养银纳米颗粒。通过使用UV-Vis光谱，扫描电子显微镜（SEM），高分辨率透射电子显微镜（TEM），傅立叶变换的红外（FT-IR）和拉曼光谱，所以得到的G-D-AG。 SEM图像表示G-D-AG的成功形成。通过SERS研究了MTZ上的MTZ对G-D-AG的行为，所述SERS研究了MTS的可靠和鲁棒基板，其表示主要是G-D-AG和MTZ之间的化学相互作用。由于SERS效应，增强了1538,1463,1342,1278,1156,11342,116,600,525和410Ω（-1）的MTZ正常光谱条带。建立了MTZ浓度和SERS信号强度的对数刻度之间的相关性，成功获得了1.43Ω×10（-12）m的低检测限。利用密度泛函理论（DFT）方法提供可靠的拉曼带的任务。

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