基于聚多巴胺薄膜的二氧化锰阵列纳米管的模板法制备及基于其离子渗透性的电分析化学研究

发布时间：2018-04-01 21:07

本文选题：聚多巴胺　切入点：模板合成　出处：《北京科技大学》2017年博士论文

【摘要】：聚多巴胺作为一种多聚物材料,具有在任意固体材料表面成膜、易修饰和生物兼容性好等优异特性。近年来,该多聚物在涉及固体材料表面修饰的诸多领域都备受关注。因此,对其理化性质和应用方向的研究具有重要意义。本论文工作中,研究了基于聚多巴胺的模板法用于二氧化锰阵列纳米管的合成;之后,为进一步探索聚多巴胺薄膜材料的离子渗透性问题,设计了基于普鲁士蓝的电化学探针,研究了薄膜厚度和环境pH等因素对聚多巴胺薄膜离子渗透性的影响,并讨论了其中涉及的机理;最后,在此基础上,进一步研究了普鲁士蓝电极表面聚多巴胺薄膜的修饰对该电极电化学性能的影响。(1)基于聚多巴胺薄膜的模板法制备二氧化锰阵列纳米管的研究本工作使用水热法在石英玻璃片表面合成了氧化锌纳米棒,以其做为模板,在其表面生成聚多巴胺薄膜,并与高锰酸钾反应,合成了二氧化锰阵列纳米管。研究发现,所制备的二氧化锰为非晶型,该二氧化锰纳米管形态良好,在基底表面的附着能力强。由于氧化锌模板具有易合成、易去除且纳米形态易于控制的特点;同时,聚多巴胺薄膜的合成方法也简便易行,这使得该二氧化锰阵列纳米管的合成方法具有简便和适用性广等特性。该合成方法也对二氧化锰新形态纳米结构材料的构建具有一定的启示作用。(2)基于普鲁士蓝电极的聚多巴胺薄膜离子渗透性的电化学研究聚多巴胺薄膜离子渗透性的研究对该材料在涉及物质扩散和渗透的吸附、分离、催化以及电化学分析等方面的应用具有重要意义。本工作利用普鲁士蓝做为电极,利用其对离子(钾离子)作为探针,研究了聚多巴胺薄膜的离子渗透性。通过循环伏安和电化学交流阻抗等手段,研究了厚度约为23、60和113 nm的聚多巴胺薄膜在不同pH环境中的离子渗透性变化,系统地总结了薄膜厚度与环境pH对聚多巴胺薄膜离子渗透性的影响,并讨论了其中涉及的过程和机理。(3)聚多巴胺薄膜对普鲁士蓝电极电化学性能的影响及相关电分析应用的研究本工作中,在上一章研究基础上,进一步研究了聚多巴胺薄膜的修饰对普鲁士蓝电极电化学性能的影响。研究发现,聚多巴胺薄膜在普鲁士蓝电极表面的修饰可有效地提高普鲁士蓝在中性溶液中的电化学稳定性,同时,也不影响该电极对过氧化氢的电化学催化。此外,聚多巴胺薄膜还可有效地阻挡对过氧化氢电化学检测过程中常见干扰物(如L-半胱氨酸、抗坏血酸和尿酸等)的电化学信号,起到较好的抗干扰效果。基于此,该电极可应用于活细胞过氧化氢的释放监测。
[Abstract]:As a kind of polymer material, polydopamine has many excellent properties such as forming film on any solid material, easy to modify and good biological compatibility. In recent years, the polymer has attracted much attention in many fields involving surface modification of solid materials. In this paper, we studied the template method based on polydopamine for the synthesis of MNO _ 2 nanotubes. In order to further explore the ion permeability of poly (dopamine) thin films, an electrochemical probe based on Prussian blue was designed to study the effects of film thickness and environmental pH on the ion permeability of polydopamine films. Finally, on the basis of this, the mechanism involved is discussed. Further study on the influence of Polydopamine Film Modification on the Surface of Prussian Blue electrode on the Electrochemical Properties of the electrode. (1) preparation of Manganese dioxide Array Nanotubes by template method based on Poly (dopamine) thin Film. Zinc oxide nanorods were synthesized on the surface of quartz glass. Using it as a template, the polydopamine film was formed on the surface and reacted with potassium permanganate to synthesize manganese dioxide array nanotubes. It was found that the prepared manganese dioxide was amorphous, and the manganese dioxide nanotube had good morphology. Because the zinc oxide template is easy to synthesize, easy to remove and easy to control the nano-morphology, at the same time, the synthesis method of the polydopamine film is also simple and feasible. This makes the synthesis method of MNO _ 2 array nanotubes simple and applicable to a wide range of properties. This synthesis method also has a certain enlightenment on the construction of new manganese dioxide nanostructured materials. (2) based on Prussian Blue, the synthesis method of MNO _ 2 nanotubes is based on Prussian Blue. Electrochemical study on the Ion permeability of Poly (dopamine) Film the adsorption of the material on the diffusion and permeation of the material. In this work, Prussian blue is used as electrode and para-ion (potassium ion) as probe. The ion permeability of poly (dopamine) films was studied by cyclic voltammetry and electrochemical impedance spectroscopy. The ion permeability of polydopamine films with thickness of 23 ~ 60 nm and 113 nm was studied in different pH conditions. The effects of film thickness and environmental pH on the ion permeability of polydopamine films were systematically summarized. The effect of polydopamine thin film on the electrochemical performance of Prussian blue electrode and the application of related electrical analysis were discussed. In this work, based on the previous chapter, the effect of polydopamine film on the electrochemical performance of Prussian blue electrode was discussed. The effect of modification of polydopamine film on the electrochemical performance of Prussian blue electrode was further studied. The modification of polydopamine film on the surface of Prussian blue electrode can effectively improve the electrochemical stability of Prussian blue in neutral solution, but also does not affect the electrochemical catalysis of hydrogen peroxide on the electrode. Poly (dopamine) films can also effectively block the electrochemical signals of common interfering substances (such as L-cysteine, ascorbic acid, uric acid, etc.) in the electrochemical detection of hydrogen peroxide. The electrode can be used to monitor the release of hydrogen peroxide from living cells.
【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TB383.1;O657.1

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