论文总字数：18324字

摘 要

Abstract……………………………………………………………………II

第一章 引言…………………………………………………………………1

1.1 储能材料的国内外研究现状……………………………………………1

1.1.1石墨烯………………………………………………………2

1.1.2 二硫化钼……………………………………………………2

1.2 研究储能材料传感性能的目的和意义…………………………………3

1.3 课题来源…………………………………………………………………4

1.4 研究思路和技术方法……………………………………………………5

1.4.1电化学传感的概念…………………………………………6

1.4.2 如何选择合适的传感材料…………………………………7

第二章 实验概述………………………………………………………10

2.1 制备氧化石墨烯………………………………………………………10

2.2 合成二硫化钼合氧化石墨烯纤维……………………………………10

2.3 传感性能测试…………………………………………………………10

第三章 实验结论………………………………………………………11

3.1形貌表征………………………………………………………………11

3.2电化学表征……………………………………………………………12

3.3传感性能测定…………………………………………………………13

结语………………………………………………………………………15

参考文献…………………………………………………………………16

致谢………………………………………………………………………18

摘要

近年来，由于过氧化氢出色的氧化还原特性，其在生物医学、食品安全、环境监管和纺织化学工程领域有着举足轻重的作用，且其在生物反应中是检测疾病和年限的信号分子，因此利用电化学传感方法来探测过氧化氢的浓度变得异常的重要。科学家们已经尝试了以蛋白质酶等物质作为过氧化氢的传递媒介，虽然此种方法有很高的灵敏度选择性，但是此方法极易被外界酸碱度等因素影响，因此科学家们提出一种非酶式过氧化氢探测电极。本文旨在通过以二硫化钼修饰氧化石墨烯纤维，通过一步水热法制备复合纤维电极，将此电极与氯化银和铂电极形成三电极体系，由此进行针对过氧化氢电化学传感的测试。本文通过SEM图展示了二硫化钼独特的层间结构和多孔的形态，表明了通过在二硫化钼晶体中引入氧原子从而生成了结合紧密的Mo-O键。通过此方法，二硫化钼/石墨烯纤维具有明显增强的电子转移活性和针对双氧水增强的电还原性能，一般情况下，得到的传感器对于双氧水的线性响应范围可达50 µM～16 mM，制备的传感器对于双氧水有很好的选择性，由此揭示了此传感系统在实际生活中的应用。

关键词：过氧化氢 电化学传感器 石墨烯 二硫化钼 复合纤维

Abstract

In recent years, due to the excellent redox properties of hydrogen peroxide, it has played a pivotal role in the fields of biomedicine, food safety, environmental supervision and textile chemical engineering, and it is a signal molecule for detecting disease and age in biological reactions. Electrochemical sensing methods to detect the concentration of hydrogen peroxide become very important. Scientists have tried to use proteins and other substances as hydrogen peroxide as the medium, although this method has a high sensitivity and selectivity, it is easily affected by factors such as the external pH, so scientists have proposed a non-enzymatic Hydrogen peroxide detection electrode. This paper aims to prepare a composite fiber electrode by one-step hydrothermal method by modifying graphene oxide fiber with molybdenum disulfide, forming a three-electrode system with this electrode and silver chloride and platinum electrode, thereby conducting electrochemical sensing for hydrogen peroxide. In this paper, the unique inter-layer structure and porous morphology of molybdenum disulfide are shown by the SEM image, which shows that by incorporating oxygen atoms in the molybdenum disulfide crystals, a tightly bound Mo-O bond is formed. By this method, molybdenum disulfide/graphene fiber has significantly enhanced electron transfer activity and enhanced electro-reduction performance against hydrogen peroxide. Under normal circumstances, the linear response of the sensor to hydrogen peroxide can reach 50 μM to 16 mM. The sensor is very selective for hydrogen peroxide, thus revealing the application of this sensor system in real life.

Key Words:MoS2 Graphene Hydrogen peroxide electrochemical sensor

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