光谱学与光谱分析, 2012, 32 (9): 2452, 网络出版: 2012-09-26   

多环芳烃的表面增强拉曼光谱探测与分析

Detection and Analysis of Polycyclic Aromatic Hydrocarbons Using Surface-Enhanced Raman Spectroscopy
作者单位
中国海洋大学光学光电子实验室, 山东 青岛 266100
摘要
首次实现了以参数优化的金溶胶为表面增强拉曼散射(SERS)活性基底探测水中痕量的多环芳烃。 采用化学还原法制备不同颗粒大小的金溶胶, 实验确定了632.8 nm激发光下的最优金纳米颗粒的平均粒径为(32±3) nm, 并以此金溶胶为基底, 探索pH值对多环芳烃增强效果的影响, 发现pH=13效果最佳, 与pH=6相比谱线绝对强度提高约20倍。 以粒径为(32±3) nm, pH=13的金溶胶为活性基底对不同浓度萘、 菲、 芘溶液进行了SERS光谱探测, 探测到的最低浓度分别为20, 4和4 nmol·L-1, 特征峰强与浓度呈线性关系, 线性拟合相关系数均在0.985以上, 三者混合溶液的SERS光谱可清晰分辨出各自的特征峰。 结果表明, 该实验所采用的SERS活性基底灵敏度较高, 具有广阔的应用前景。
Abstract
In the present paper, the gold colloid with parameters optimized was used as surface-enhanced Raman scattering(SERS) active substrate to realize the trace detection of polycyclic aromatic hydrocarbons(PAHs) in water for the first time. Gold colloids with different size were prepared using chemical reduction method, and the optimum size selected at 632.8 nm excitation wavelength by experiment is (32±3) nm. The influence of pH value on the enhancement of PAHs was researched, and the optimal pH value is 13. Spectral intensity increased by approximately 20-fold compared with pH 6. The SERS spectra of naphthalene, phenanthrene and pyrene aqueous solutions were detected by the optimum gold colloid, and the minimum concentrations obtained were 20, 4 and 4nmol·L-1, respectively. There was a linear relationship between peak intensity and concentration, and the linear regression correlation coefficients were all above 0.985. For the mixture, the authors could distinguish each PAH easily for their own characteristic peaks. The experimental results show that such active substrate has a very high sensitivity as well as good application prospect.

马君, 刘澍, 史晓凤, 韩晓红, 孔德地, 郑荣儿. 多环芳烃的表面增强拉曼光谱探测与分析[J]. 光谱学与光谱分析, 2012, 32(9): 2452. MA Jun, LIU Shu, SHI Xiao-feng, HAN Xiao-hong, KONG De-di, ZHENG Rong-er. Detection and Analysis of Polycyclic Aromatic Hydrocarbons Using Surface-Enhanced Raman Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2012, 32(9): 2452.

本文已被 7 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!