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摘要石墨烯由于自身的缺陷在应用中受到限制，研究发现在石墨烯中掺杂氮原子可以提高材料的电化学性能。而Ni-Cu复合材料广泛用作电催化材料，它与氮掺杂石墨烯复合后，复合材料的电化学灵敏度大大提高，可在电化学传感器方面得到进一步应用。本论文在玻碳电极上构建了氮掺杂石墨烯负载PEDOT/Ni-Cu复合材料，并对尿酸进行了电化学检测。电极的制备条件及性能都进行了优化。氮掺杂石墨烯用量为4μg，PEDOT聚合圈数为2圈，Ni-Cu混合溶液富集时间为180s，沉积电位为-1.2V，电沉积时间为60s的条件下，修饰电极对尿酸的响应最大。检测过程为修饰电极上是两电子两质子反应，修饰电极对尿酸的检出限为0.2367μM，由此可见NiCu/PEDOT/NGE/GCE修饰电极是一种灵敏度高，检测范围宽，检测限低的尿酸传感器。28492
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关键词 氮掺杂石墨烯 电化学传感器 Ni-Cu复合材料
毕业论文设计说明书外文摘要
Title NiCu/PEDOT/NGE Modified Glass Carbon Electrode As Uric Acid Electrochemical Sensor
Abstract
Because of the defects of graphene itself, the application has been confined to particular fields. It has been reported that the doping of nitrogen atoms to graphene could improve the electrical property effectively. Ni-Cu composite has been widely used as electrochemical catalyst, when introduced to NGE, the electro-sensitivity can be greatly improved, thus, the composite may be further apply to the electrochemical sensing. This paper proposed a NiCu/PEDOT/NGE modified glassy carbon electrode as a electrosensor for the detection of uric acid, the experiment parameters have been optimized. The optimal parameters are as follows: the NGE modified quantity is 4 μg. PEDOT polymerization cycle number is 2, the enrichment time of Ni-Cu deposition is 180s, Ni-Cu deposition potential is -1.2V and the deposition time is 60s, the pH of electrolyte is 4. The electron transfer process is proved to be a 2-proton 2-electron reaction, and the limit of UA detection is 0.2367μM. It is concluded that the NiCu/PEDOT/NGE/GCE modified electrode is a good UA electrochemical sensor.
Keywords Nitrogen doped graphen Electrochemical sensor
Ni-Cu composite materials
目 次
1 绪论 1
1.1 石墨烯 1
1.2氧化石墨烯 2
1.3氮掺杂石墨烯 3
1.4 PEDOT 5
1.5金属电沉积 8
1.6 本文主要工作内容 8
2 氮掺杂石墨烯负载Ni-Cu复合材料的制备及其性能 10
2.1 引言 10
2.2 实验部分 10
2.3 结果与讨论 12
结论 24
致谢 25
参考文献 26
1 绪论
电化学传感器是目前研究较多、应用较为广泛的一种化学传感器。作为化学传感器的一个重要分支，它由识别元件、信号转换装置、数据处理系统和显示系统三部分组成，并通过三者结合在一起检测的待测物，然后按照一定的规律将物质转换成可以识别的电信号，通过对电信号进行处理，监测出待测物质及其浓度[1]。电化学传感器具有很多优点，如检测限低、响应时间短、灵敏度高、操作简单、易于实现微型化等，且所需的仪器简单、便宜，所以广泛应用于各领域中。