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Title: | 奈米銀線與石墨烯於功能性薄膜之應用:可撓曲式電極、超級電容、可拉式阻氣薄膜 Silver nanowires and graphene sheets apply on applications of flexible electrode, supercapacitor and stretchable gas-permeation barrier |
Authors: | Dung-Yue Su 蘇東裕 |
Advisor: | 蔡豐羽(Feng-Yu Tsai) |
Keyword: | 奈米銀線合成,透明導電阻氣薄膜,原子層沉積技術,超級電容器,石墨烯,可拉伸式阻氣膜,溶劑交換法, synthesis of silver nanowires,transparent conductive gas barrier,atomic layer deposition,supercapacitor,graphene,stretchable gas barrier,solvent exchange, |
Publication Year : | 2019 |
Degree: | 博士 |
Abstract: | 本研究致力於以奈米銀線開發可撓曲式電極、以石墨烯開發阻氣膜,以解決現有技術之問題。於可撓曲式電極的研究中,我們成功開發一新穎奈米銀線合成技術、以及結合銀線與ALD薄膜沉積技術製備透明導電阻氣薄膜與超級電容,以解決主流電極材料ITO薄膜不耐撓曲、不符合可撓式元件需求及儲能技術之重要課題:低成本、高電容值。
奈米銀線合成技術中,我們使用溴化銅做為反映控制劑,於大氣下以溶液態製程合成奈米銀線,並搭配最佳化溴化銅濃度及工業上可用之噴塗製程添加前驅物,以達到製備高長寬比奈米銀線之目的。 針對透明導電阻氣薄膜的部分,我們使用本實驗室所開發之氧化鉿摻雜氧化鋅導電薄膜,並將此薄膜與奈米銀線薄膜結合,藉由雙氧水處理進行銀線界面性質調控,我們成功的開發出高導電性、阻氣性、高穩定性、高可撓曲性之透明導電薄膜,其性能超越ITO/PET薄膜,並可同時作為鈣鈦礦太陽能電池之電極與電子傳輸層,達到略優於使用ITO薄膜製備之電池效率。 在超級電容的開發中,我們使用可溶液態製備之高表面積奈米銀線電極,搭配最佳化ALD前驅物暴露製程,於多孔之奈米銀線電極表面沉積高品質之ALD介電層與導電層,進一步提升電容值,成功開發出具有高體積電容值之超級電容器(193.5 mF/cm3)。 於可拉伸式阻氣膜的研究中,我們成利用溶劑交換法大幅提升石墨烯於聚胺脂彈性體中之分散性,進而延長氣體滲透所需行走之路徑,成功製備高可拉伸性、高阻氣性、良好機械強度及熱穩定性之複合薄膜。 The dissertation focus on development of flexible electrode and stretchable gas barrier. For the field of flexible electrodes, synthesis of silver nanowires (AgNWs) and integration of AgNWs with atomic layer deposition (ALD) in flexible electrodes and supercapacitors were studied to address the key issues of flexible electronics: (i) nature brittle and insufficient performance of indium tin oxide (ITO), which is current dominant material of transparent conductive electrode, and (ii) major goal of energy storage: high capacitance and cost-effective fabrication. In the part of synthesis of silver nanowires, we developed a solution processed route to synthesize silver nanowires with high aspect ratio in ambient condition through optimizing copper bromide concentration and injection of ultrasonic atomization of silver precursor. In the part of transparent conductive gas barrier, we utilized a novel ALD hafnium-doped zinc oxide (HZO) process, a good transparent conductive gas barrier process developed in our laboratory. To deposited thin HZO layer with plastic-compatible temperature, excellent gas barrier performance and flexibility, integrating with silver nanowires film and H2O2 treatment of AgNWs interfaces, we successfully developed a HZO/AgNW hybrid transparent conductive gas barrier with performance superior to ITO/PET. In addition, we also demonstrated the feasibility of the HZO/AgNW hybrid film for perovskite solar cells, which can simultaneously as transparent electrode and electron collection layer, and the cells using hybrid films displayed slightly better photovoltaic performance than the devices using commercial ITO as electrode. In the part of supercapacitor, we utilized high surface-area silver nanowires network, which could be fabricated by spray coating of silver nanowires, and integrating with ALD dielectric and conductive layer to fabricate supercapacitor with high volumetric capacitance (193.5 mF/cm3). In the part of stretchable gas barrier, we utilized solvent exchange method, which could significantly improve graphene dispersibility in polyurethane. Therefore, tortuous path of gas in polyurethane was prolonged, and resulting in respectable WVTR reduction, and its comprehensive properties were improved. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73435 |
DOI: | 10.6342/NTU201900755 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 材料科學與工程學系 |
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ntu-108-1.pdf Restricted Access | 3.98 MB | Adobe PDF |
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