氮掺杂石墨烯复合物的制备及其电化学发光行为研究

发布时间：2018-05-26 11:58

本文选题：氮掺杂石墨烯 + 电化学发光　；参考：《安徽大学》2015年硕士论文

【摘要】：电化学发光分析具有灵敏度高、分析速度快、可控性好等一系列优点,因此在分析检测领域具有广泛的应用。制备氮掺杂石墨烯是材料领域的一个研究热点,因为氮掺杂石墨烯具有优异的光电性质,在纳米电子器件、生物传感器、能源科学等领域有广泛的应用前景。本论文通过表面吸附、共价键和、层层组装等方式,将氮掺杂石墨烯与纳米粒子、氮掺杂石墨烯与双光子吸收配合物结合,构建了电化学发光传感器。对氮掺杂石墨烯及其复合物组成和形貌进行了表征,探讨了复合物的电化学性质和电化学发光机理,研究了电化学发光传感器的性质,并将其用于分析检测。主要研究内容如下：1.氮掺杂石墨烯/碲化镉量子点复合物的制备及其电化学发光行为通过将氮掺杂石墨烯与碲化镉量子点结合,建立了一种增强复合材料电化学发光的方法。将氮掺杂石墨烯(NG)与碲化镉量子点(NG/CdTe QDs)修饰在玻碳电极表面,制备了NG/CdTe QDs复合物电化学发光生物传感器。利用扫描电镜、透射电镜、X射线衍射仪、紫外-可见光谱仪、红外光谱仪、荧光光谱仪、阻抗分析仪对所得产物进行了表征。探讨了该生物传感器的电化学发光机理和影响因素。研究结果表明,所制备的生物传感器不仅具有较高的电化学发光强度,而且稳定性好,生物相容性好。样品分析结果表明,该传感器可用于测定抗坏血酸,检测范围为0.04～200 gM,检测限为0.0151μM。2.硫端基CdS2L配合物的电化学发光行为利用溶剂热法合成了一种结构新颖的硫端基CdS2L配合物。一系列实验结果表明,合成的CdS2L在过硫酸钾溶液中具有较好的电化学发光性质。通过比较它的双光子吸收性质和电化学发光性质,讨论了影响CdS2L发光的因素及其电化学发光机制,在此基础上,利用CdS2L构建了一种性质稳定的固态电化学发光生物传感器,该生物传感器对谷胱甘肽具有良好的响应,响应的线性范围为0.002～4μM。该研究结果拓展了双光子吸收材料的应用范围。3.氮掺杂石墨烯/CdS2L配合物的电化学发光行为通过层层组装技术,将氮掺杂石墨烯和CdS2L配合物修饰在玻碳电极表面,制备NG/CdS2L复合物电化学发光生物传感器。测试结果显示,该传感器具有较好的电化学发光性质。通过改变实验条件,研究了该生物传感器的影响因素。样品测试结果表明,该传感器对尿酸有灵敏、快速的响应,在最佳条件下尿酸浓度在0.002～2μM范围内,电化学发光强度的对数与浓度的对数具有线性关系。
[Abstract]:Electrochemiluminescence analysis has a series of advantages, such as high sensitivity, fast analysis speed, good controllability and so on, so it has a wide range of applications in the field of analysis and detection. The preparation of nitrogen-doped graphene is a research hotspot in the field of materials, because of its excellent photoelectric properties, nitrogen doped graphene has a broad application prospect in nanoelectronic devices, biosensors, energy science and other fields. In this paper, a chemiluminescence sensor was constructed by combining nitrogen-doped graphene with nanoparticles, nitrogen-doped graphene and two-photon absorption complex by surface adsorption, covalent bonding and layer-by-layer assembly. The composition and morphology of nitrogen-doped graphene and its complexes were characterized. The electrochemical properties and electroluminescence mechanism of the complexes were discussed. The properties of electroluminescent sensors were studied and used for analysis and detection. The main research contents are as follows: 1. Preparation and electrochemiluminescence behavior of nitrogen-doped graphene / cadmium telluride quantum dot complexes a method for enhancing electrochemiluminescence of composite materials was established by combining nitrogen-doped graphene with cadmium telluride quantum dots. The NG/CdTe QDs complex electroluminescent biosensor was prepared by modifying nitrogen-doped graphene with cadmium telluride quantum dot NG- / CdTe QDson the surface of glassy carbon electrode. The products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) X-ray diffractometer, UV-Vis spectrometer, infrared spectrometer, fluorescence spectrometer and impedance analyzer. The electrochemiluminescence mechanism and influencing factors of the biosensor were discussed. The results show that the biosensor not only has high electrochemical luminescence intensity, but also has good stability and biocompatibility. The results of sample analysis show that the sensor can be used for the determination of ascorbic acid with a detection range of 0.04g / m and a detection limit of 0.0151 渭 M.2. Electrochemiluminescence behavior of sulfur terminal CdS2L complexes a novel sulfur terminal CdS2L complex was synthesized by solvothermal method. A series of experimental results show that the synthesized CdS2L has good electrochemiluminescence properties in potassium persulfate solution. By comparing its two-photon absorption and electrochemiluminescence properties, the factors affecting CdS2L luminescence and its electrochemiluminescence mechanism are discussed. On the basis of this, a solid-state electroluminescent biosensor with stable properties is constructed by using CdS2L. The biosensor has a good response to glutathione with a linear range of 0.002 渭 m. The results extend the application scope of two-photon absorption material. 3. Electrochemiluminescence behavior of nitrogen-doped graphene / CdS2L complexes by layer-by-layer assembly technique, nitrogen-doped graphene and CdS2L complexes were modified on the surface of glassy carbon electrode to prepare NG/CdS2L complex electroluminescent biosensor. The results show that the sensor has good electrochemical luminescence properties. The influencing factors of the biosensor were studied by changing the experimental conditions. The sample test results show that the sensor is sensitive and rapid to uric acid, and the logarithm of ECL intensity has a linear relationship with the logarithm of concentration in the range of 0.002 渭 M under the optimum conditions.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O613.71;TB33

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