钴酞菁修饰石墨烯复合材料制备及其电催化性能研究
发布时间：2018-10-25 18:53
【摘要】：石墨烯机械强度高、导电性好、比表面积大,作为电极修饰材料被广泛用于电化学生物传感器研究领域。本论文利用水溶性阳离子型钴酞菁非共价修饰石墨烯得到的纳米复合材料具有良好的分散性,易于成膜,将其用于电极表面修饰,对其电化学催化性能进行了研究。具体内容如下:1.首先利用静电和π-π吸附作用制备了阳离子型钴酞菁修饰的石墨烯纳米复合材料(ImCoPc/RGO)。采用紫外-可见吸收光谱、红外吸收光谱、扫描电子显微镜(SEM)等技术对得到的纳米复合材料结构及相貌进行了表征。然后以滴涂法构筑了 ImCoPc/RGO/GCE修饰电极,利用循环伏安法(CV)和差示脉冲伏安法(DPV)考察了该修饰电极对生物分子多巴胺(DA )以及NaNO_2的电化学检测性能。结果表明,ImCoPc/RGO/GCE修饰电极可以用于多巴胺检测,最佳pH=7.0 ,检测范围为10 ～ 800 μM ,检测灵敏度为83μA·mM~(-1),检出限为0.057 μM。该修饰电极催化多巴胺氧化反应属于表面控制过程,且抗坏血酸存在下可以实现对多巴胺的选择性检测。对NaNO2检测范围为3 ～120 μM ,灵敏度为28.16 μA·M~(-1),检出限为0.005 μM ,修饰电极催化NaNO2氧化反应属于扩散控制过程。此外,所制备的修饰电极在测试中均呈现出良好的稳定性和重现性。2.利用层层自组装技术在玻碳电极表面修饰了多层复合薄膜(ImCOPc/RGO)n ( n=1～6),利用循环伏安法和阻抗测定进行了表征。并将所得电极用于水溶液中亚硝酸盐检测。结果表明,复合薄膜n=4时电极催化性能最佳,对NaNO2的检测范围为0.1～1.4 mM ,灵敏度为2.787 μA·M~(-1),检出限15 μM,修饰电极催化NaNO2氧化反应属于扩散控制过程,且呈现出良好的稳定性和重现性。
[Abstract]:Graphene is widely used in electrochemical biosensors because of its high mechanical strength, good electrical conductivity and large specific surface area. In this paper, the nano-composites prepared by non-covalent modification of graphene with water-soluble cationic cobalt phthalocyanine have good dispersion and are easy to form films. The nano-composites are used to modify the electrode surface and their electrochemical catalytic properties are studied. The specific contents are as follows: 1. Firstly, cationic cobalt phthalocyanine modified graphene nanocomposites (ImCoPc/RGO) were prepared by electrostatic and 蟺-蟺 adsorption. The structure and appearance of the nanocomposites were characterized by UV-Vis absorption spectra, infrared absorption spectra and scanning electron microscopy (SEM) (SEM). Then the ImCoPc/RGO/GCE modified electrode was constructed by drop coating method. The electrochemical detection properties of the modified electrode for dopamine (DA) and NaNO_2 were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results showed that ImCoPc/RGO/GCE modified electrode could be used for the detection of dopamine. The optimal detection range was 10 ~ 800 渭 M, the detection sensitivity was 83 渭 A mM~ (-1) and the detection limit was 0.057 渭 M. The oxidation of dopamine catalyzed by the modified electrode is a surface controlled process, and the selective detection of dopamine can be achieved in the presence of ascorbic acid. The detection range of NaNO2 is 3 ~ 120 渭 M, the sensitivity is 28.16 渭 A M ~ (-1), the detection limit is 0.005 渭 M. the oxidation of NaNO2 catalyzed by modified electrode is a diffusion control process. In addition, the modified electrodes showed good stability and reproducibility. 2. 2. The multilayer composite film (ImCOPc/RGO) n (ng 1 + 6) was modified on the surface of glassy carbon electrode by layer self-assembly technique and characterized by cyclic voltammetry and impedance measurement. The electrode was used to detect nitrite in aqueous solution. The results show that the electrode has the best catalytic performance when the composite film n = 4. The detection range of NaNO2 is 0.1 mM, the sensitivity is 2.787 渭 A M ~ (-1), the detection limit is 15 渭 M. The oxidation of NaNO2 catalyzed by modified electrode belongs to the diffusion control process and has good stability and reproducibility.
【学位授予单位】：辽宁大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332;O657.1
本文编号：2294535
[Abstract]:Graphene is widely used in electrochemical biosensors because of its high mechanical strength, good electrical conductivity and large specific surface area. In this paper, the nano-composites prepared by non-covalent modification of graphene with water-soluble cationic cobalt phthalocyanine have good dispersion and are easy to form films. The nano-composites are used to modify the electrode surface and their electrochemical catalytic properties are studied. The specific contents are as follows: 1. Firstly, cationic cobalt phthalocyanine modified graphene nanocomposites (ImCoPc/RGO) were prepared by electrostatic and 蟺-蟺 adsorption. The structure and appearance of the nanocomposites were characterized by UV-Vis absorption spectra, infrared absorption spectra and scanning electron microscopy (SEM) (SEM). Then the ImCoPc/RGO/GCE modified electrode was constructed by drop coating method. The electrochemical detection properties of the modified electrode for dopamine (DA) and NaNO_2 were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results showed that ImCoPc/RGO/GCE modified electrode could be used for the detection of dopamine. The optimal detection range was 10 ~ 800 渭 M, the detection sensitivity was 83 渭 A mM~ (-1) and the detection limit was 0.057 渭 M. The oxidation of dopamine catalyzed by the modified electrode is a surface controlled process, and the selective detection of dopamine can be achieved in the presence of ascorbic acid. The detection range of NaNO2 is 3 ~ 120 渭 M, the sensitivity is 28.16 渭 A M ~ (-1), the detection limit is 0.005 渭 M. the oxidation of NaNO2 catalyzed by modified electrode is a diffusion control process. In addition, the modified electrodes showed good stability and reproducibility. 2. 2. The multilayer composite film (ImCOPc/RGO) n (ng 1 + 6) was modified on the surface of glassy carbon electrode by layer self-assembly technique and characterized by cyclic voltammetry and impedance measurement. The electrode was used to detect nitrite in aqueous solution. The results show that the electrode has the best catalytic performance when the composite film n = 4. The detection range of NaNO2 is 0.1 mM, the sensitivity is 2.787 渭 A M ~ (-1), the detection limit is 15 渭 M. The oxidation of NaNO2 catalyzed by modified electrode belongs to the diffusion control process and has good stability and reproducibility.
【学位授予单位】：辽宁大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332;O657.1
【参考文献】
相关期刊论文 前2条
1 过家好;何晓英;郑东旭;陈俊明;;Pt-Ru/GC电极对甲醇电催化氧化的研究[J];化学研究与应用;2012年03期
2 白青龙;张春花;程传辉;李万程;杜国同;;α和β-四(4-甲氧基苯氧基)酞菁锌的合成、表征和电化学性质[J];化学学报;2011年08期
相关硕士学位论文 前2条
1 李国琴;光敏染料/氧化石墨烯多层薄膜制备及光电性能研究[D];辽宁大学;2016年
2 王飞;石墨烯—卟啉复合电极的制备及其电催化活性研究[D];哈尔滨工业大学;2014年
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