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標題: | 局域表面電漿子與石墨烯材料之交互作用 The Interaction of Localized Surface Plasmon with Graphene Based Materials |
作者: | Yu Wang 王瑜 |
指導教授: | 陳俊維(Chun-Wei Chen) |
關鍵字: | 表面電漿子,石墨烯,石墨烯氧化物, surface plasmon,graphene,graphene oxide, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 石墨烯具有高導電性、高機械強度、和高穿透度等性質,使之在光電應用上具有很大的潛力。然而由於石墨烯為一零能隙之材料,因此在眾多可應用的領域中,缺少了以石墨烯為發光材料之光學應用。石墨烯氧化物為石墨烯之衍生物,可視為在ㄧ石墨烯基面上接上許多含氧官能基,造成由sp2和sp3鍵結之碳原子所組成的混和式原子和電子結構。不同於石墨烯,此混和式電子結構使石墨烯氧化物具有能隙及本質發光。藉由調變石墨烯氧化物之電子結構和環境參數等,其本質發光表現可從藍光至近紅外光。石墨烯氧化物之本質發光特性以及其溶液製程上之相容性提供了石墨烯材料在光學應用上的潛力。然而石墨烯氧化物之發光效率與其他傳統發光材料相比相對較低 (小於0.1%),限制了其研究和實際應用上的發展。因此本研究主要致力於運用局域表面電漿子此物理方式增強石墨烯氧化物之發光效率,且利用此結果能成功觀測到單原子層之石墨烯氧化物的本質發光。最後一章則利用石墨烯電極之高穿透度和超薄特性,將局域表面電漿子運用在以石墨烯作為電極之有機高分子元件上,增進元件之光電流。另外,利用可調變波長之雷射光源,系統性的分析在元件結構中被局域表面電漿子影響之主動層材料的光學性質。 Graphene with its unique electrical, mechanical and thermal properties has attracted great research and technological interest. Beyond numerous possible optoelectronics applications, light emission from pristine graphene is hard to present due to the absence of band gap. In contrast, graphene oxide (GO) as a graphene derivative functionalized with oxygen-containing groups has demonstrated interesting steady-state photoluminescence (PL) emission ranged from near infrared (NIR) to blue fluorescence which can attributed to its heterogeneous atomic and electronic structures. However, the intrinsic PL quantum yield of GO which is less than ~0.1 % is relatively low, limiting its potential in technological applications and leaves the fluorescence of single-layer GO sheet remain unforeseen. In this study, we utilizing Localized Surface Plasmons (LSP) technique as a physical fluorescence enhancing method without changing the atomic structure of GO. By presenting silver nanoparticles (Ag NPs) in the proximity of GO, the assisted absorption and radiative recombination of GO by incident light excited LSP resonance will lead to fluorescence enhancement of GO. The LSP enhanced fluorescent properties of GO thin film consist of only few-layers GO sheets are demonstrated. Moreover, with the advantage of LSP, we successfully obtained the fluorescence image of single-layer GO sheet which thickness corresponds to single atomic layer. In the last Chapter, we took the advantage of ultra-thin graphene transparent electrode to combine it with Ag NPs for demonstrating LSP enhanced photocurrent of the organic polymer photodetector. The optical properties of LSP affected active material under the device structure were also studied by utilizing supercontinnum laser system, which enabled the analysis with various excitation and emission wavelengths. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65315 |
全文授權: | 有償授權 |
顯示於系所單位: | 材料科學與工程學系 |
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