本文關(guān)鍵詞： 石墨烯 硅錐 硒化鋅 合成 光電性能　出處：《東華大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：自2004年發(fā)現(xiàn)石墨烯以來，石墨烯及其復(fù)合納米材料在材料科學(xué)、納米電子學(xué)等領(lǐng)域引起了人們的極大關(guān)注。石墨烯是世界上最薄的二維材料，并具有獨(dú)特的電學(xué)性能、良好的穩(wěn)定性和高的長徑比，這使其成為良好的場發(fā)射材料。但石墨烯存在的一些缺點(diǎn)也是我們不能忽視的，比如其非剛性結(jié)構(gòu)導(dǎo)致容易聚合。所以科研人員花費(fèi)了大量的精力來研究以石墨烯為基底的復(fù)合材料，通過與其他材料的復(fù)合，克服自身缺陷，發(fā)揮自身的優(yōu)勢。本論文中，分兩部分分別研究石墨烯/ZnSe復(fù)合物、石墨烯/硅錐復(fù)合物的制備及其光電特性。 1.我們利用水熱法在石墨烯薄膜表面生長出ZnSe微米球，形成石墨烯/ZnSe復(fù)合材料并研究其光電性能。實(shí)驗(yàn)中我們發(fā)現(xiàn)不同濃度的EDTA對復(fù)合物的形貌及光學(xué)性能都產(chǎn)生較大的影響。當(dāng)EDTA濃度為0.30M時(shí)，大量像仙人球一樣的ZnSe微米球生長在石墨烯薄膜表面，并且其平均直徑大約為10μm；當(dāng)EDTA濃度為0.45M時(shí)，ZnSe微米球的形狀像蜂巢一樣，而不是長成仙人球狀。通過XRD圖譜，我們可以得出形成的ZnSe微米球?yàn)榱⒎介W鋅礦結(jié)構(gòu)。對復(fù)合物的光學(xué)性能研究發(fā)現(xiàn)該復(fù)合物在225nm處有最大的紫外可見吸收光；在468nm處存在最強(qiáng)的近帶邊發(fā)射峰。 2.我們通過LP-CVD法在銅箔表面制備出了大面積石墨烯薄膜，，并用離子束轟擊方法制備了硅納米錐陣列，最后分別將石墨烯薄膜轉(zhuǎn)移到硅晶圓和硅納米錐陣列表面并研究其場發(fā)射性能。材料的場增強(qiáng)因子與發(fā)射體形狀和幾何參數(shù)相關(guān)。由于石墨烯薄膜的曲率與硅錐尖端的曲率是一致的，因此它們具有相同的增強(qiáng)因子。據(jù)此得出隨著硅納米錐曲率的增加，覆蓋其上的石墨烯的功函數(shù)降低，并改善石墨烯場發(fā)射的性能。 研究結(jié)果表明，石墨烯薄膜及其復(fù)合納米材料有望在可折疊柔性光電器件等方面得到廣泛應(yīng)用。
[Abstract]:Since the discovery of graphene in 2004, graphene and its composite nanomaterials have attracted great attention in materials science, nanoelectronics and other fields. Graphene is the thinnest two-dimensional material in the world. It has unique electrical properties, good stability and high aspect ratio, which makes it a good field emission material, but some shortcomings of graphene can not be ignored. For example, its non-rigid structure makes it easy to polymerize. Therefore, researchers have devoted a lot of effort to studying graphene based composites, which can overcome their own defects by combining with other materials. In this thesis, the preparation and photoelectric properties of graphene / ZnSe composites, graphene / silicon cone composites and graphene / ZnSe composites are studied in two parts. 1. ZnSe microspheres were grown on the surface of graphene film by hydrothermal method. Graphene / ZnSe composites were formed and their optoelectronic properties were studied. We found that the morphology and optical properties of graphene / ZnSe composites were greatly affected by different concentrations of EDTA. When the concentration of EDTA was 0. 30m. A large number of ZnSe microspheres like cactus grow on the surface of graphene film, and their average diameter is about 10 渭 m. When the concentration of EDTA is 0. 45m, the microspheres are shaped like honeycomb instead of growing into cactus. Through the XRD pattern. It is found that the ZnSe microspheres are cubic sphalerite structure. The optical properties of the composite show that the composite has the largest UV visible absorption at 225 nm. There is the strongest near band emission peak at 468 nm. 2. Large area graphene thin films were prepared on copper foil by LP-CVD method, and silicon nanocone arrays were prepared by ion beam bombardment. Finally, the graphene film was transferred to the surface of silicon crystal circle and silicon nanocone array and its field emission properties were studied. The field enhancement factor of the material is related to the shape and geometric parameters of the emitter. Because of the curvature of graphene film and the silicon cone, the field enhancement factor of the material is related to the shape and geometry of the emitter. The curvature of the tip is the same. Therefore, they have the same enhancement factors. It is concluded that with the increase of the curvature of silicon nanometers, the work function of graphene coated on it decreases and the field emission performance of graphene is improved. The results show that graphene thin films and composite nanomaterials are expected to be widely used in folding flexible optoelectronic devices.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1;O613.71

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