本文關(guān)鍵詞： 氧化石墨烯 石墨烯 納米銀 二氧化鈦 雜化材料　出處：《安慶師范學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：石墨烯是近些年以來發(fā)現(xiàn)的二維碳原子晶體材料,理想石墨烯的結(jié)構(gòu)可以認(rèn)為是被剝離的單原子層石墨,是碳原子以sp2雜化軌道組成六角型呈蜂巢晶格的平面薄膜,厚度僅為0.337nm,是目前世界上已知最薄的單原子厚度材料。石墨烯的這種特殊結(jié)構(gòu),使得其表現(xiàn)出許多優(yōu)異的性質(zhì),如超高的電子遷移率、極大的比表面積和優(yōu)良的導(dǎo)熱性能等等。近年來,利用石墨烯來對一些材料進(jìn)行修飾以及制備性能更好的雜化材料是當(dāng)下的研究熱點(diǎn)。本論文主要從以下幾個(gè)方面開展了研究工作:1.采用改進(jìn)的Hummers法氧化處理天然石墨粉以制取石墨烯前驅(qū)物氧化石墨,利用超聲作用將制得的氧化石墨剝離,從而得到均勻分散的氧化石墨烯膠狀懸浮液。利用XRD、TEM以及SEM對樣品進(jìn)行了形貌、結(jié)構(gòu)的表征分析。2.合成石墨烯-銀納米粒子雜化材料。銀納米顆粒擁有著很強(qiáng)的紫外-可見光吸收和局域表面等離子體共振等性質(zhì),在表面增強(qiáng)拉曼光譜(SERS)和非線性光學(xué)等方面具有著非常良好的應(yīng)用前景。而石墨烯具有單原子層厚度和良好的導(dǎo)電導(dǎo)熱性能,是一種非常優(yōu)良的襯底材料。研究發(fā)現(xiàn),在石墨烯-銀納米粒子雜化材料中,銀納米顆粒分散在石墨烯片層表面,不僅抑制了自身的團(tuán)聚,還在很大程度上拓寬了Ag納米粒子的應(yīng)用范圍。3.石墨烯/二氧化鈦雜化材料的合成及光催化性能的研究:二氧化鈦由于其對環(huán)境污染小并且化學(xué)性質(zhì)非常穩(wěn)定等一些特性成為了當(dāng)下最有發(fā)展?jié)摿Φ墓獯呋牧现�。但是其也有自身的局限�?比如光利用率低和載流子容易復(fù)合等等。利用其與石墨烯形成雜化材料可以將二氧化鈦的光吸收拓展至可見光區(qū)域,還可以提高載流子分離的效率,從而可以做到提高整個(gè)復(fù)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.
【學(xué)位授予單位】：安慶師范學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ127.11;O643.36

【共引文獻(xiàn)】

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相關(guān)博士學(xué)位論文 前1條

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本文編號：1497624