臺灣博碩士論文加值系統

本論文的研究工作重點如下：(1)溶膠凝膠法搭配靜電紡絲技術製備奈米級鈮酸鈉鉀(KxNa1-xNbO3; KNN)纖維網絡結構；(2)靜電紡絲法(ESP)與液相摻雜法製作rGO/KNN複合纖維；(3) rGO/KNN複合纖維結合收集器轉速參數製備出有序性電紡絲纖維；(4) rGO/KNN複合纖維紡製於矽基板的四點探針導電性測試；(5) rGO/KNN複合纖維紡在矽基板進行壓電力顯微鏡(PFM)分析測試。
研究結果顯示，吾人以ESP技術可獲得高線徑均一性與密集度之KNN奈米纖維，透過調控製程參數製成有序排列的KNN奈米纖維結構，以ESP法與液相摻雜法可獲得均勻佈植石墨烯的rGO/KNN複合奈米纖維，其中採用液相摻雜法有效提升rGO的含量並維持KNN纖維的完整形貌。將液相摻雜法獲得之rGO/KNN複合纖維進行四點探針導電性測試中，發現添加rGO的液相摻雜樣品能有效提升rGO/KNN複合奈米纖維的導電性。設計ESP技術紡製rGO/KNN複合奈米纖維的壓電響應分析結果指出，rGO/KNN複合奈米纖維的rGO摻雜量由其有助於改善壓電奈米纖維的d33值，由原本的6.36 pm/V提升至18.4 pm/V，此結果顯示rGO有效提升壓電響應能力。

This work aims at the following aspects including (a) preparation of KxNa1-xNbO3 (KNN) nanofibers via both sol-gel and electrospinning (ESP); (b) production of rGO/KNN composite nanofibers by ESP and liquid doping method; (c) four-point probe conductivity test of rGO/KNN composite nanofiber on silicon substrate; and (d) piezoelectric force microscope test of rGO/KNN composite nanofibers deposited on silicon substrate.
The results show that KNN nanofibers of uniform size and density by optimzing the process parameters to form an highly oriented and aligned nanofiber structure. The rGO/KNN composite nanofibers with uniform distribution of implanted graphene were achieved by ESP and liquid doping routes for enhancing the graphene particle doping efficiency and morphological uniformity of KNN fibers. The results show that samples via liquid doping of graphene to increasing electrical conductivity. The electrospun rGO/KNN composite nanofibers examined by a piezoelectric force microscopy (PFM) indicated that the rGO/KNN composite nanofiber with graphene doping will enhance its piezoelectric perfromnace by increasing d33 coefficient from 6.36 pm/V to 18.4 pm/V. We believe that our rGO/KNN composite nanofibers are definitely of a great potential in developing novel applications of flexible electronic devices.

致 謝...........................................I
摘 要...........................................II
ABSTRACT.........................................III
目 錄...........................................IV
圖目錄...........................................VII
表目錄...........................................XII
第一章 緒 論.....................................1
1.1 研究動機......................................1
1.2 研究目的及重點.................................3
第二章 理論基礎....................................8
2.1 靜電紡絲理論與研究.............................8
2.1.1 靜電紡絲之研究...............................8
2.1.2 臨界電位理論(theory of critical value).......11
2.1.3 靜電紡絲之不穩定性射流........................12
2.1.4 影響靜電紡絲之基本參數........................13
2.1.5 合成無機靜電紡絲..............................18
2.2 材料系統之介紹..................................19
2.2.1 鈮酸鉀(KNbO3; KN)............................19
2.2.2 鈮酸鈉(NaNbO3; NN)...........................23
2.2.3 鈮酸鈉鉀((Na1- xK x)NbO3; KNN)...............24
2.3 溶膠凝膠法基本介紹..............................29
2.4 石墨烯之介紹....................................35
2.4.1 碳材料與石墨烯................................35
2.4.2 石墨烯的性質..................................36
2.4.3 石墨烯的製備與應用............................37
2.5 壓電陶瓷的重要電器特性..........................38
2.5.1 機電耦合因子(k)..............................38
2.5.2 介電損失因子.................................39
2.5.3 機械品質因子(Qm).............................40
2.5.4 頻率常數(N)..................................41
2.5.5 壓電應變常數(d)..............................42
2.6 靜電紡絲纖維薄膜壓電之應用......................44
第三章 實驗步驟與方法...............................47
3.1製備鈮酸鈉鉀奈米纖維.............................47
3.1.1 溶膠凝膠法製備氫氧化鈮........................47
3.1.2 溶膠凝膠法製備KNN電紡絲前驅液.................51
3.1.3 哈默法製備氧化石墨烯(GO)......................52
3.1.4 靜電紡絲技術製備KNN纖維.......................54
3.2 靜電紡絲技術製備奈米級KNN纖維之反應參數...........55
3.2.1 前驅液黏度對鈮酸鈉鉀纖維之影響.................55
3.2.2 鈮酸鈉鉀濃度對鈮酸鈉鉀纖維之影響...............56
3.2.3 工作電壓對鈮酸鈉鉀纖維之影響...................57
3.2.4 工作距離對鈮酸鈉鉀纖維之影響...................58
3.2.5 收集器轉速對於鈮酸鈉鉀纖維之影響...............58
3.3 還原氧化石墨烯摻雜鈮酸鈉鉀纖維製程................59
3.3.1 靜電紡絲法製備rGO/KNN複合纖維..................59
3.3.2 液相摻雜法製備rGO/KNN複合纖維..................60
3.4 製備rGO/KNN奈米纖維膜壓電測試....................61
3.5 樣品之材料特性分析...............................62
3.5.1 圓錐-平板式黏度計..............................62
3.5.2 冷場發射掃描式電子顯微鏡表面顯微結構分析.........64
3.5.3 高解析X光繞射儀成分分析........................64
3.5.4 共焦式拉曼散射光譜儀(Raman spctroscopy)........65
3.5.5 四點探針(four-point probe)....................67
3.5.6 高解析多功能掃描式探針顯微鏡之壓電響應力特性分析..68
第四章 結果與討論....................................75
4.1製備奈米級鈮酸鈉鉀纖維薄膜.........................75
4.1.1 前驅液黏度對鈮酸鈉鉀纖維之影響..................75
4.1.2 鈮酸鈉鉀濃度對鈮酸鈉鉀纖維之影響.................77
4.1.3 工作電壓對鈮酸鈉鉀纖維之影響.....................81
4.1.4 工作距離對鈮酸鈉鉀纖維之影響.....................84
4.1.5 收集器轉速對鈮酸鈉鉀奈米纖維的影響................86
4.2石墨烯摻雜鈮酸鈉鉀纖維製程..........................87
4.2.1 靜電紡絲法製備rGO/KNN複合纖維....................88
4.2.2 液相摻雜法-改變熱還原溫度製備rGO/KNN纖維..........89
4.2.3 不同石墨烯含量的液相摻雜製備rGO/KNN纖維...........93
4.3製備rGO/KNN奈米複合纖維進行四點探針導電性測試.........95
4.4 製備rGO/KNN奈米複合纖維進行壓電響應量測.............96
4.5 未來研究方向......................................103
第五章 結 論.........................................106
參考文獻..............................................108
作 者 簡 歷...........................................117

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