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Surface-enhanced Raman scattering of thiram: Quantitative and theoretical analyses
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-15 , DOI: 10.1002/jrs.6222 Marcelo J. S. Oliveira 1 , Cibely S. Martin 1 , Rafael J. G. Rubira 1 , Augusto Batagin‐Neto 2 , Carlos J. L. Constantino 1 , Ricardo F. Aroca 3
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-08-15 , DOI: 10.1002/jrs.6222 Marcelo J. S. Oliveira 1 , Cibely S. Martin 1 , Rafael J. G. Rubira 1 , Augusto Batagin‐Neto 2 , Carlos J. L. Constantino 1 , Ricardo F. Aroca 3
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The development of strategies to monitor the applications of pesticides is of primary importance. In the present report, two aspects of the surface-enhanced Raman scattering (SERS) effect of the fungicide thiram were investigated: quantitative analysis using the standard addition method and the thiram adsorption mechanism onto Ag nanostructures using theoretical approach. Experimentally, SERS intensity varies linearly from 1.0 × 10−8 to 4.0 × 10−7 mol/L with thiram concentration leading to a limit of detection of 1.2 × 10−8 mol/L for the band at 560 cm−1 and 1.7 × 10−9 mol/L for 1386 cm−1. The loss of linearity (above 10−6 mol/L) was associated with changes in the Ag colloid aggregation, also indicated by complementary analyses via UV-Vis extinction spectroscopy, dynamic light scattering, and zeta potential. The differences in the spectral profiles observed for thiram Raman powder and SERS are ascribed to S–S cleavage, leading the degraded thiram adsorbing to Ag surface not only through S atoms but also through methyl groups.
中文翻译：
福美双的表面增强拉曼散射：定量和理论分析
制定监测农药应用的策略至关重要。在本报告中，研究了杀菌剂福美双的表面增强拉曼散射 (SERS) 效应的两个方面：使用标准添加法的定量分析和使用理论方法的福美双在 Ag 纳米结构上的吸附机制。实验上，SERS 强度从 1.0 × 10 -8到 4.0 × 10 -7 mol/L线性变化，福美双浓度导致 560 cm -1和 1.7 ×处的条带的检测限为 1.2 × 10 -8 mol/L 10 -9 mol/L 对于 1386 cm -1。线性损失（高于 10 -6 mol/L) 与 Ag 胶体聚集的变化有关，也通过紫外-可见消光光谱、动态光散射和 zeta 电位的互补分析表明。对于福美双拉曼粉末和 SERS 观察到的光谱曲线的差异归因于 S-S 裂解，导致降解的福美双不仅通过 S 原子而且通过甲基吸附到 Ag 表面。
更新日期：2021-08-15
中文翻译：
福美双的表面增强拉曼散射：定量和理论分析
制定监测农药应用的策略至关重要。在本报告中，研究了杀菌剂福美双的表面增强拉曼散射 (SERS) 效应的两个方面：使用标准添加法的定量分析和使用理论方法的福美双在 Ag 纳米结构上的吸附机制。实验上，SERS 强度从 1.0 × 10 -8到 4.0 × 10 -7 mol/L线性变化，福美双浓度导致 560 cm -1和 1.7 ×处的条带的检测限为 1.2 × 10 -8 mol/L 10 -9 mol/L 对于 1386 cm -1。线性损失（高于 10 -6 mol/L) 与 Ag 胶体聚集的变化有关，也通过紫外-可见消光光谱、动态光散射和 zeta 电位的互补分析表明。对于福美双拉曼粉末和 SERS 观察到的光谱曲线的差异归因于 S-S 裂解，导致降解的福美双不仅通过 S 原子而且通过甲基吸附到 Ag 表面。
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