银纳米颗粒溶胶表面增强红外基底对低浓度福美双农药的快速检测

采用水热法制备了一种银纳米颗粒溶胶，通过乙醇洗涤后得到银纳米颗粒表面增强红外基底，用于检测低浓度福美双农药。结果表明，该增强基底可检测低至10^-7mol/L的福美双农药，且不同浓度下福美双溶液的表面增强红外光谱强度呈现良好的线性关系，该基底对福美双分子的红外光谱增强能力高达150倍。银纳米颗粒的富集作用、电荷转移机制和电磁增强机制的共同作用使福美双的红外光谱得到显著增强。

Infrared intensity enhancement by an Ag nanoparticle sol for the rapid detection of thiram in dilute solution

An Ag nanoparticle sol has been prepared using hydrothermal synthesis and a surface enhanced infrared absorption spectroscopy (SEIRAS) substrate for the detection of thiram in dilute solution was obtained by washing the sol several times. Our results indicate that thiram solutions with concentrations as low as 10^-7mol/L could be detected by SEIRAS and the intensity enhancement shows a good linear correlation with the concentration. A 150-fold enhancement in the detection of thiram was obtained by using the Ag nanoparticle sol substrate. The enhancement results from the enrichment effect of the Ag nanoparticles, the charge transfer mechanism and the electromagnetic mechanism.