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
目 录
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