State Key Laboratory of Chemo/Biosensing and Chemometrics, Department of Chemistry, Hunan University, Changsha 410082, China.
Analyst. 2012 Sep 7;137(17):4010-5. doi: 10.1039/c2an35589b. Epub 2012 Jul 10.
This work aims at the development of a fast scanning method for organic pollutants with low-cost small Raman spectrometers. A gold nanoparticles-embedded alginate gel is prepared and applied as the substrate for surface enhanced Raman spectrometric detection of polycyclic aromatic hydrocarbons (PAHs). The target molecules are captured by the three-dimensional network of the alginate gel, and brought close to the hot spots generated by gold nanoparticles embedded in the gel. Significant Raman enhancement effects are observed in the analysis of four typical PAH compounds including pyrene, anthracene, fluorene and benzo(a)pyrene. Quantitative analysis of BaP shows a limit of detection of 0.365 nM using a low-cost small Raman spectrometer, which is comparable to published values. The practicability of the method is tested by analyzing PAHs in different water samples, offering a fast scanning method for PAHs.
本工作旨在开发一种使用低成本小型拉曼光谱仪快速扫描有机污染物的方法。制备了一种嵌入金纳米粒子的海藻酸钠凝胶，并将其用作用于多环芳烃（PAHs）的表面增强拉曼光谱检测的基底。目标分子被海藻酸钠凝胶的三维网络捕获，并被带到嵌入凝胶中的金纳米粒子产生的热点附近。在对四种典型的 PAH 化合物包括芘、蒽、芴和苯并(a)芘的分析中观察到显著的拉曼增强效应。使用低成本小型拉曼光谱仪对 BaP 进行定量分析，检测限达到 0.365 nM，与已发表的值相当。通过分析不同水样中的 PAHs 测试了该方法的实用性，为 PAHs 提供了一种快速扫描方法。
