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摘要：本课题的目的是制备稳定性好、重现性强、灵敏度高、选择性佳的氧化石墨烯/镧修饰碳糊电极，以实现对DA的检测。这一新型改性材料是由氧化石墨烯和氧化石墨烯/镧复合物合成的。根据循环伏安法(CV)和差示脉冲伏安法(DPV)，用氧化石墨烯-镧修饰碳糊电极(GO-La/CPE)选择性检测多巴胺。用傅里叶变换光谱(FTIR), 紫外可见吸收光谱(UV-vis) 以及扫描电子显微镜检查法(SEM) 来表征成功合成的GO-La复合物和GO-La/CPE。我们研究了一些影响修饰电极的电催化活性的因素，例如pH值，扫描速率以及浓度的影响。同时也研究了 DA 在 GO-La/CPE 上的一些电化学参数。由于氧化石墨烯和镧离子的结合，GO-La/CPE被赋予了大表面积，高催化活性，高选择性和灵敏度。在最佳条件下，检测DA的线性响应范围是从1 μM到 25 μM，其相应的检测极限在0.099 μM (S/N = 3)。32444
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本实验证明了由氧化石墨烯/镧复合物制备的新修饰碳糊电极可以用来选择性检测多巴胺。通常电子转移系数、扩散系数和电子/质子转移数的都是一些比较重要的电化学参数。实验中我们计划并研究了多巴胺在 GO-La/CPE 上的这些电化学参数。
毕业论文关键词：氧化石墨烯，镧，碳糊电极，多巴胺，传感器
GO-La/CPE modified electrode on selective detection of dopamine
Abstract: The aim of this work is to fabricate a graphene oxide/lanthanum-modified carbon paste electrode with strong reproducibility good stabilitylow, highly sensitive and selective detection to achieve the detection of DA。The novel modified materials was made use of GO and GO-La complexes. A graphene oxide/lanthanum-modified carbon paste electrode (GO-La/CPE) was fabricated for the selective detection of dopamine (DA) levels by cyclic voltammetry (CV) and differential pulse voltammetric (DPV). Fourier trans forminfrared spectra (FTIR), Ultraviolet-visible (UV-vis) and scanning electron microscopy (SEM) were used to characterize the successful synthesis of GO-La complexes and GO-La/CPE. Several factors which affect the electrocatalytic activity of the modified electrode, such as the effect of pH, the scan rate and the concentration were studied. The electrochemical parameters of DA on GO-La/CPE were also investigated. Due to the combination of graphene oxide and lanthanum ions, the GO-La/CPE electrode was endowed large surface area, high catalytic activity, high selectivity and sensitivity toward the oxidation of DA. In optimized conditions, the linear response range for detection of DA was from 1 μM to 25 μM, and the corresponding detection limit was 0.099 μM (S/N = 3).
Generally, the electrochemical parameters of the electron transfer coefficient, diffusion coefficient, and electron/proton transfer number are very important. In this experiment, these parameters of DA on GO-La/CPE were also investigated.
KeyWords：Graphene oxide, Lanthanum, carbon paste electrode, DA, Biosensor
目 录
1 绪论 1
1.1 课题背景 1
1.2 选课意义 2
2 化学修饰电极 4
2.1 化学修饰电极 4
2.1.1 化学修饰电极的由来 4
2.1.2 化学修饰电极的制备和类型 4
2.2 化学修饰电极的应用 4
2.2.1 在分析化学中的应用 4
2.2.2 在电化学元件中的应用 5
2.2.3 在有机电解反应中的应用 5
2.2.4 在电池电极上的应用 5
3 化学修饰碳糊电极 7
3.1 氧化石墨烯的简介 7
3.2 氧化石墨烯的功能化 7
3.3 化学修饰碳糊电极 10