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摘要：锗硫属化合物由于其在催化、吸附、光电导体、离子交换、非线性光学、半导体、锂离子电池等方面的应用，近年来已经作为一种新型的多功能材料日益受到人们的重视。而GeS2纳米材料的合成及其复合物的制备还较少被研究，其应用更是鲜有报导。35576
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石墨烯是拥有sp2杂化轨道的二文碳原子晶体，它不仅拥有优异的电学性能，质量轻，导热性好，比表面积大，它的杨氏模量（1100 GPa）和断裂强度（125 GPa）也可以与碳纳米管相媲美，并且还具有一些独特的性能，如量子霍尔效应、量子隧穿效应等。但是，石墨烯本身不是半导体材料。因此，一般将石墨烯和其他半导体材料进行复合，从而提高材料本身的性能。
因此，本课题利用一步溶剂热法制备出具有一定纯度和结晶度的GeS2-石墨烯纳米复合材料，考察溶剂、反应温度、反应时间、浓度等实验条件对产物的影响，并初步研究石墨烯对GeS2纳米片光电效应的增强作用。
毕业论文关键词：氧化还原石墨烯；纳米材料；溶剂热法；制备
Abstract
Recently, germanium chalcogenides as a series of novel multifunctional materials have attracted a lot of attention. They have been widely applied to catalysis, adsorption, photoelectric conductor, ion exchange, non-linear optics, semiconductor, and lithium ion battery. However, reports on preparations of GeS2 based composite are very rare.
Graphene is a kind of 2D nanomaterial with sp2 hybrid orbitals, it has excellent electronic property and light weight, good thermal conductivity, and big specific area. What’s more, Young’s module (1100 Gpa) and breaking strength (125 Gpa) of graphene can compete with carbon nanotubes. Graphene also has some unique properties like quantum hall effect and quantum tunneling effect. However, graphene is not a semiconductor. Therefore, researchers tend to build composites upon graphene and other semiconductor materials to enhance their properties.
Based on that, we prepared crystalline GeS2-rGO composite through a one-pot solvothermal process. After that, we studied the influences of reaction temperature, reaction time, and concentration on products. Enhancement of optoelectronic property of GeS2 nanoplates by graphene was also discussed.
Keywords:Redox graphene;Nanomaterials;Solvothermal;Preparation
目录
1 绪论 1
1.1 GeS2纳米材料合成研究进展 1
1.2 石墨烯复合物的研究进展 3
1.2.1石墨烯与贵金属复合体系 3
1.2.2石墨烯与无机非金属材料复合体系 3
1.2.3 石墨烯与金属氧化物半导体材料复合体系 4
1.3 石墨烯纳米复合物的应用 4
1.3.1石墨烯复合体系在SERS基底材料方面的应用 4
1.3.2石墨烯复合体系在污染物去除方面的应用 5
1.4 研究意义与目的 5
1.4.1 意义 5
1.4.2 目的 6
2 实验部分 7
2.1 仪器与试剂 7
2.1.1 仪器 7
2.1.2 试剂 7
2.2 实验方法 8
2.2.1 氧化石墨的制备 8
2.2.2 GeS2-rGO纳米复合物的制备 9
2.2.3 样品表征 9
3 结果与讨论 10
3.1 GeS2-石墨烯纳米片的表征 10
3.1.1 XRD分析 10
3.1.2 GeS2-rGO纳米复合物的拉曼光谱 11
3.1.3 GeS2-rGO的形貌分析 12
3.2 条件实验结果讨论 12
3.2.1 GO加入量对产物结晶度的影响 12