石墨烯基多元杂化材料的制备及其光催化性能研究

发布时间：2018-02-09 09:35

本文关键词： 氧化石墨烯石墨烯纳米银二氧化钛杂化材料　出处：《安庆师范学院》2015年硕士论文　论文类型：学位论文

【摘要】：石墨烯是近些年以来发现的二维碳原子晶体材料,理想石墨烯的结构可以认为是被剥离的单原子层石墨,是碳原子以sp2杂化轨道组成六角型呈蜂巢晶格的平面薄膜,厚度仅为0.337nm,是目前世界上已知最薄的单原子厚度材料。石墨烯的这种特殊结构,使得其表现出许多优异的性质,如超高的电子迁移率、极大的比表面积和优良的导热性能等等。近年来,利用石墨烯来对一些材料进行修饰以及制备性能更好的杂化材料是当下的研究热点。本论文主要从以下几个方面开展了研究工作:1.采用改进的Hummers法氧化处理天然石墨粉以制取石墨烯前驱物氧化石墨,利用超声作用将制得的氧化石墨剥离,从而得到均匀分散的氧化石墨烯胶状悬浮液。利用XRD、TEM以及SEM对样品进行了形貌、结构的表征分析。2.合成石墨烯-银纳米粒子杂化材料。银纳米颗粒拥有着很强的紫外-可见光吸收和局域表面等离子体共振等性质,在表面增强拉曼光谱(SERS)和非线性光学等方面具有着非常良好的应用前景。而石墨烯具有单原子层厚度和良好的导电导热性能,是一种非常优良的衬底材料。研究发现,在石墨烯-银纳米粒子杂化材料中,银纳米颗粒分散在石墨烯片层表面,不仅抑制了自身的团聚,还在很大程度上拓宽了Ag纳米粒子的应用范围。3.石墨烯/二氧化钛杂化材料的合成及光催化性能的研究:二氧化钛由于其对环境污染小并且化学性质非常稳定等一些特性成为了当下最有发展潜力的光催化材料之一。但是其也有自身的局限性,比如光利用率低和载流子容易复合等等。利用其与石墨烯形成杂化材料可以将二氧化钛的光吸收拓展至可见光区域,还可以提高载流子分离的效率,从而可以做到提高整个复合材料的光催化效率。
[Abstract]:Graphene is a two-dimensional crystal material of carbon atom discovered in recent years. The structure of ideal graphene can be considered as the exfoliated monatomic layer graphite, which is a plane film of hexagonal honeycomb lattice composed of carbon atoms with sp2 hybrid orbitals. The thickness of graphene is only 0.337 nm, which is the thinnest monatomic thickness material known in the world at present. This special structure of graphene makes it exhibit many excellent properties, such as high electron mobility. Great specific surface area and excellent thermal conductivity etc. In recent years, Modification of some materials by graphene and preparation of hybrid materials with better performance are the current research hotspots. In this thesis, the following aspects of research work have been carried out. 1. The modified Hummers method is used to oxidize natural materials. Graphite oxide as a precursor of graphene, The colloidal suspension of graphene oxide was obtained by stripping the prepared graphite oxide by ultrasonic. The morphology of the sample was characterized by XRDI TEM and SEM. Synthesis of graphene-silver nanoparticles hybrid materials. Silver nanoparticles have strong UV-Vis absorption and local surface plasmon resonance (SPR) properties. The surface enhanced Raman spectroscopy (SERS) and nonlinear optics have good application prospects, while graphene is a very good substrate material with monatomic layer thickness and good conductivity and thermal conductivity. In graphene-silver nanoparticles hybrid materials, silver nanoparticles are dispersed on the surface of graphene sheets, which not only inhibit their own agglomeration, The application range of Ag nanoparticles has been widened to a great extent. 3. Synthesis of graphene / titanium dioxide hybrid materials and study of their photocatalytic properties: titanium dioxide has little environmental pollution and its chemical properties are very stable, etc. Some of the characteristics have become one of the most promising photocatalytic materials, but they also have their own limitations. For example, low light utilization rate, easy recombination of carriers, and so on. The light absorption of titanium dioxide can be extended to visible light region and the efficiency of carrier separation can be improved by using it to form hybrid materials with graphene. Thus, the photocatalytic efficiency of the whole composite can be improved.
【学位授予单位】：安庆师范学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.11;O643.36

【共引文献】