摘  要：由于掺氮石墨烯优良的化学性能，以及Au纳米粒子良好的生物相容性和催化性能，近年来对掺氮石墨烯-Au纳米复合材料的研究成为热点。本论文采用改进的Hummers法制备氧化石墨，用尿素作为氮源，采用溶剂热法制备掺氮石墨烯-Au纳米复合材料，同时实现石墨烯的氮掺杂和Au纳米颗粒的负载。利用SEM和XRD等表征技术对掺氮石墨烯-Au纳米复合材料进行分析，确定该复合材料的组成和结构，以此复合材料构建电化学传感器，并用于同时检测DNA碱基的鸟嘌呤和腺嘌呤。电化学实验表明，掺氮石墨烯-Au纳米复合材料具有优异的电催化性能，不仅能降低鸟嘌呤和腺嘌呤的氧化电位，还能有效分离二者的氧化峰，可以实现鸟嘌呤和腺嘌呤的同时检测。93409

毕业论文关 键 词：掺氮石墨烯-Au纳米复合材料，电催化，鸟嘌呤，腺嘌呤，检测

Abstract: Due to its good chemical properties of nitrogen doped graphene and excellent biocompatibility and conductivity of Au nanoparticles, in recent years more and more researches have focus on nitrogen doped graphene-Au nanocomposites。 In this paper using graphene prepared by modified Hummers method as raw material and urea as nitrogen source, nitrogen-doped graphene-Au nanocomposites were synthesized by solvothermal method。 SEM and XRD were employed to characterize the microstructure and composition of nitrogen-doped graphene-Au nanocomposites。 Based on the nitrogen-doped graphene-Au nanocomposites, the electrochemical sensor was constructed to simultaneously determine guanine and adenine。 The electrochemical experiments show that nitrogen-doped graphene-Au nanocomposites modified on electrode can both decrease the oxidation potential and separate guanine and adenine effectively。  Consequently, nitrogen-doped graphene-Au nanocomposites possess excellent electrocatalytic performance sothat they can be used to build electrochemical sensors to determine different kinds of biomolecules。 

Keywords: nitrogen-doped graphene-Au nanocomposites，electrocatalysis, guanine, adenine, determnation 源F于K优B尔C论V文N网WwW.youeRw.com 原文+QQ752^018766

目  录

1  前言 3

1。1  石墨烯的基本性质研究 3

1。1。1  石墨烯的结构和性质 3

1。1。2  石墨烯的制备 3

1。1。3  石墨烯的应用 5

1。2  掺氮石墨烯的概述 6

2  掺氮石墨烯—Au纳米复合材料的制备 6

2。1  实验部分 6

2。1。1  实验试剂 6

2。1。2  实验装置 6

2。1。3 样品的制备及表征 7

3  掺氮石墨烯—Au纳米复合材料的电催化性能测试 9

3。1  电化学传感器 9

3。2  实验准备 10

3。2。1  产品处理 10

3。2。2  玻碳电极的打磨与清洗 10

3。2。3  缓冲溶液的配制与处理 10

3。3  电催化性能的测试 10

结  论 15

参 考 文 献 16

致  谢