论文部分内容阅读
通过化学浴沉积的方法制备了一种高SERS活性和重复性的银薄膜衬底。分别采用扫描电子显微镜和拉曼光谱研究了沉积时间对银薄膜微观形貌和SERS活性的影响,优化的沉积时间为120分钟。利用优化的银薄膜衬底,可以检测到10-9 M的罗丹明分子的SERS谱图,表明该银薄膜衬底具有很高的SERS活性。相同实验条件下,在一片银薄膜衬底上任意选择16个点测试R6G的SERS谱图。分别计算了R6G的8个特征峰16次检测的相对标准偏差,最大相对标准偏差小于13%。实验结果表明,该衬底具有很好的重复性,可应用于SERS的定量分析。采用优化的银薄膜衬底检测了不同浓度的芥子气及其水解产物硫二甘醇。分别结合芥子气和硫二甘醇的常规拉曼光谱和文献报道,对它们的SERS谱图进行了指认和归属。20分钟内,对芥子气和硫二甘醇的检测限可分别达到320ppm和1ppm(g/g)。
A high SERS activity and repeatability silver thin film substrate was prepared by chemical bath deposition. The effects of deposition time on the morphology and SERS activity of silver thin films were investigated by scanning electron microscopy and Raman spectroscopy, respectively. The optimized deposition time was 120 minutes. SERS spectra of 10-9 M rhodamine molecules can be detected by the optimized silver thin film substrate, indicating that the silver thin film substrate has a high SERS activity. Under the same experimental conditions, the SERS spectrum of R6G was selected at random on a silver thin film substrate. The relative standard deviations (RSDs) of 16 determinations of 8 characteristic peaks of R6G were calculated respectively, and the maximum relative standard deviation was less than 13%. The experimental results show that the substrate has good repeatability and can be applied to the quantitative analysis of SERS. An optimized silver thin film substrate was used to detect different concentrations of mustard gas and its hydrolyzate thiodiglycol. Combined with the conventional Raman spectra of mustard gas and thiodiglycol and reported in the literature, their SERS spectra were identified and assigned. The limits of detection for mustard gas and thiodiglycol were 320 ppm and 1 ppm (g / g), respectively, in 20 minutes.