【作者】 金明；

【导师】 周育红；

【作者基本信息】 哈尔滨工业大学 ， 化学， 2020， 硕士

【摘要】 表面增强拉曼散射（Surface Enhanced Raman Spectroscopy,SERS）技术是近年来取得飞速进步的一种针对待测物的超灵敏检测技术,广泛应用于水环境污染物检测、生命科学以及化学传感器等领域。金属有机框架材料（Metal Organic Frameworks,MOFs）是近年来发展的有机-无机杂化材料,是由金属离子中心节点以及有机配体连接为骨架构筑成规则的新型多孔材料,在吸附、分离、催化等诸多领域均有重要的应用,ZIF-8（Zeolitic Imidazolate Framework-8）是其中一种典型的MOF材料。本研究采制备了几种不同的复合SERS基底,并对几种有机污染物罗丹明6G、结晶紫以及孔雀石绿污染物分子进行SERS检测。通过水热还原法合成银纳米线,然后通过不同含量比例的银纳米线与ZIF-8前驱体溶液混合,在室温条件下ZIF-8包裹在银纳米线表面,合成了的Ag NW@ZIF-8复合SERS基底。不同的含量配比可以合成贯穿在银纳米线上不同疏密程度的ZIF-8。通过对两种典型的有机染料污染物分子罗丹明6G、孔雀石绿进行SERS检测,最低检测浓度分别能达到10^-10、10^-9 mol/L。对材料的稳定性进行测试表明其最大SERS增强效果能保持20天,保持30天的材料仍具有较好的SERS增强效果,对材料的重复性进行测试同样能得到令人满意的结果。利用向不同含量的ZIF-8添加单宁酸自组装合成花状的ZIF-8材料,并在表面原位生长银纳米粒子合成花状ZIF-8@Ag NPs复合材料。通过添加不同含量的ZIF-8合成不同形貌的花状材料,测试表明其中花状ZIF-8@Ag NPs-c具有最优异的SERS性能,对于罗丹明6G、结晶紫及孔雀石绿的最低检测浓度分别能达到10^-14、10^-13、10^-12 mol/L。对材料的稳定性进行测试表明其最大SERS增强效果能保持90天,保持180天的材料仍具有较好的SERS增强效果,对材料的重复性进行测试同样能得到令人满意的结果。本实验通过将银基纳米材料与ZIF-8相结合,通过两种具有优异性能材料的协同作用,为表面增强拉曼散射技术的发展提供新的思路。更多还原

【Abstract】 Surface Enhanced Raman Spectroscopy（SERS）technology is an ultra-sensitive detection technology for analytes that has made rapid progress in recent years.It is widely used in the detection of water environment pollutants,life sciences,and chemical sensors.Metal Organic Frameworks（MOFs）are organic-inorganic hybrid materials developed in recent years.They are a new type of porous materials that are connected by metal ion central nodes and organic ligands to form a bone structure.They are used for adsorption,separation and catalysis.ZIF-8（Zeolitic Imidazolate Framework-8）is one of the typical MOF materials.In this thesis,several different composite SERS substrates were prepared,and several organic pollutants rhodamine 6G,crystal violet and malachite green pollutant molecules were detected by SERS.The silver nanowires were synthesized by hydrothermal reduction method,and then the silver nanowires in different proportions were mixed with the ZIF-8 precursor solution,and ZIF-8 was wrapped on the surface of the silver nanowires at room temperature to synthesize Ag NW@ZIF-8 compound SERS substrate.Different content ratios can synthesize ZIF-8 with different densities throughout the silver nanowires.The two typical organic dye pollutant molecules rhodamine 6G and malachite green were tested by SERS,and the lowest detection concentrations were 10^-10 and 10^-9 mol/L respectively.The test of the stability of the material shows that the maximum SERS enhancement effect can be maintained for 20 days,and the material maintained for 30 days still has a good SERS enhancement effect.The test of the repeatability of the material can also obtain satisfactory results.Flower-like ZIF-8 material was synthesized by adding tannic acid to ZIF-8 with different contents,and silver nanoparticles were grown on the surface to synthesize flower-like ZIF-8@Ag NPs composite material.By adding different amounts of ZIF-8 to synthesize flower-like materials with different morphologies,it has been shown that flower-like ZIF-8@Ag NPs-c have the best SERS performance.The lowest detection concentrations for rhodamine 6G,crystal violet and malachite green were 10^-14,10^-13,10^-12 mol/L.Testing the stability of the material shows that the maximum SERS enhancement effect can be maintained for 90 days,and the material maintained for 180 days still has a good SERS enhancement effect,and the repeatability test of the material can also obtain satisfactory results.In this experiment,it provides new ideas for the development of surface-enhanced Raman scattering technology through the synergy of excellent properties by combining silver-based nanomaterials with ZIF-8.更多还原