AgNPs/SiO_(2)纳米碗表面增强拉曼光谱基底的制备及多环芳烃检测  

Fabrication of surface enhanced Raman spectroscopy substrates composed of silver nanoparticles/SiO_(2)nanobowls for the detection of polycyclic aromatic hydrocarbons

作　　者：王世强[1] 金艳 姜慧芸 安飞 朱亮[1] 肖安山[1] WANG Shiqiang;JIN Yan;JIANG Huiyun;AN Fei;ZHU Liang;XIAO Anshan(State Key Laboratory of Safety and Control for Chemicals,SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Qingdao 266100,China)

机构地区：[1]化学品安全控制国家重点实验室,中石化安全工程研究院有限公司,青岛266100

出　　处：《分析试验室》2024年第6期805-813,共9页Chinese Journal of Analysis Laboratory

基　　金：国家重点研发计划(2022YFB3205504);国家自然科学基金(52003297)资助。

摘　　要：以胶体自组装方法为基础,制备二氧化硅(SiO_(2))纳米碗阵列;利用多巴胺在其表面原位还原一层银纳米颗粒(Ag NPs);然后修饰一层硫醇分子,得到硫醇修饰的Ag NPs/SiO_(2)纳米碗复合表面增强拉曼光谱(SERS)基底。通过调节Ag NPs的密度和硫醇分子的种类,得到最优化的SERS基底。该SERS基底对芘和菲的检出限均为1×10^(-7)mol/L,在1×10^(-2)~1×10^(-7)mol/L浓度范围内,拉曼信号强度与芘和菲浓度呈线性关系,相关系数(R^(2))均大于0.99。该基底具有良好的均一性和重复性,芘分子(1×10^(-5)mol/L)在592和1402 cm^(-1)处拉曼信号强度的相对标准偏差(RSD)分别为4.0%和4.9%。该方法制备的复合SERS基底在水中痕量多环芳烃以及其他污染物的高灵敏度检测等方面有广阔的应用前景。Based on the colloidal self-assembly method,the silica(SiO_(2))nanobowl arrays were easily fabricated.A layer of silver nanoparticles(AgNPs)was in-situ reduced by dopamine on the surface of the nanobowls,and then the mercaptan molecules were added to fabricate mercaptan modified AgNPs/SiO_(2)nanobowls hierarchical surface enhanced Raman spectroscopy(SERS)substrates.The optimized SERS substrates could be obtained by adjusting the density of AgNPs and the type of mercaptan molecule.The experimental results indicated that the limits of detection of pyrene and phenanthrene by the SERS substrates were both 10^(-7)mol/L,and the linear correlation coefficients(R^(2))of Raman signal intensity and concentration were also above 0.99 in the concentration range of 1×10^(-2)-1×10^(-7)mol/L.The SERS substrates showed excellent uniformity and repeatability.The relative standard deviations(RSDs)of the Raman signal intensity of pyrene molecules(1×10^(-5)mol/L)at 592cm^(-1)and 1402 cm^(-1)were 4.0%and 4.9%,respectively.The SERS substrate prepared by this method will be applied in various application areas,such as high sensitivity detection of trace amounts of polycyclic aromatic hydrocarbons(PAHs)and other contaminants in water.

关 键 词：表面增强拉曼光谱 银纳米颗粒/二氧化硅纳米碗 硫醇 疏水作用 多环芳烃 

分 类 号：O657.37[理学—分析化学]