溶剂热法制备掺氮石墨烯-Au纳米复合材料及其对多巴胺的选择性检测

摘要：掺氮石墨烯具有诸多优良的性能，而Au纳米粒子具有显著的表面效应和量子尺寸效应，近几年来大量科研工作者对掺氮石墨烯-Au纳米复合材料进行广泛研究。多巴胺属于神经递质，是一种脑内分泌物，其浓度变化可反映人体的健康状况。本论文以氧化石墨为原料，采用溶剂热法制备掺氮石墨烯-Au纳米复合材料。运用SEM、XRD等对复合材料进行表征，确认其组成和结构。构建基于复合材料的电化学传感器，并用于检测多巴胺分子。电化学实验表明，掺氮石墨烯-Au纳米复合材料对多巴胺具有良好的催化作用，可实现多巴胺的高灵敏度检测，其线性范围为1~500 μM，检测限为0。24 μM（S/N=3）。92656

毕业论文关键词：掺氮石墨烯-Au纳米复合材料，多巴胺，电化学传感器，检测

Abstract: Due to its excellent properties of nitrogen-doped graphene and remarkable surface effect and quantum size effect of Au nanoparticles, a large number of researchers have explored synthesis and applications of nitrogen-doped graphene-Au nanocomposites in recent years。 Dopamine as a kind of neurotransmitter, is a brain secretions, and the change of its concentration indicates the health status of the human body。 In this paper, using graphite oxide and urea as raw materials nitrogen doped graphene-Au nanoparticle nanocomposites were synthesized by solvothermal method。 Then the microstructure and composition were characterized by SEM and XRD。 Electrochemical sensor was constructed to determine dopamine based on as-prepared nitrogen doped graphene-Au nanocomposites。 The results show that nitrogen doped graphene-Au nanocomposites possess excellent catalytic activity toward the redox of dopamine。 Consequently, the electrochemical sensor can be used to determine dopamine with high sensitivity。 The detection limit is 0。24 μM（S/N=3）。来自优O尔P论R文T网WWw.YoueRw.com 加QQ7520`18766

Keywords: nitrogen-doped graphene-Au nanocomposite, dopamine, electrochemical sensor, determination

1 前言 3

1。1 石墨烯的研究概况 3

1。1。1 石墨烯的基本性质和结构 3

1。1。2 石墨烯的制备过程 3

1。1。3 石墨烯的用途 5

1。2 掺氮石墨烯的概述 5

1。3 掺氮石墨烯-Au纳米复合材料的概述 6

1。3。1掺氮石墨烯-Au纳米复合材料的应用 6

1。4 多巴胺的概述 6

2 实验部分 7

2。1实验试剂 7

2。2实验装置 7

2。3实验步骤 8

2。3。1氧化石墨的制备 8

2。3。2掺氮石墨烯—Au纳米复合材料的制备 8

2。3。3产品处理 9

2。3。4玻碳电极的打磨与清洗 9

2。3。5 缓冲溶液的配置 10

3 结果与讨论 10

3。1掺氮石墨烯—Au纳米复合材料的合成与表征 10

3。2 掺氮石墨烯—Au纳米复合材料对多巴胺的选择性检测 12

3。2。1 选择性检测溶剂热法制备掺氮石墨烯-Au纳米复合材料及其对多巴胺的选择性检测:http://www.youerw.com/huaxue/lunwen_200357.html