臺灣博碩士論文加值系統

本研究透過靜電紡絲製備二氧化錫(SnO2)奈米纖維並與鈣鈦礦錫酸鋇(BaSnO3)進行複合，紡絲實驗中透過改變高分子含量與工作電壓探討材料特性，並使用計算流體力學(CFD)輔助驗證紡絲實驗結果，取得最佳纖維狀態並應用於氣體感測器。分析結果顯示，當紡絲溶液黏度隨著實驗次數增加下得到的纖維平均直徑會隨著黏度提升下增加，而電場分佈除了影響纖維的粗細外，也會影響纖維分佈於收集板上的範圍。當PVP含量在10 wt.%且電壓在13 kV時進行紡絲可得到直徑分佈較均勻的纖維，與模擬結果吻合。經過XRD與EDS檢測下得知SnO2經過550 ℃燒結過後可以產生結晶，並在工作溫度275 ℃時可對10 ppm的硫化氫(H2S)產生63.5 %之響應。本研究使用BaSnO3鈣鈦礦材料作為SnO2氣體感測器之複合材料並進行氣體感測測試，實驗結果表明SnO2/BaSnO3複合材料在相同工作溫度時與純SnO2纖維相比出現響應增強現象，經過連續性測試下得知SnO2/BaSnO3複合材料工作溫度在255 ℃、H2S濃度在10 ppm的時候SnO2/BaSnO3擁有最穩定的響應，響應值維持在76 %。

This study presents tin oxide (SnO2) nanofibers by electrospinning and composite with barium stannate perovskite (BaSnO3). The electrospinning experiments were conducted by changing the polymer content and working voltage to explore the material properties and using computational fluid dynamics (CFD) to validate the outcomes of spinning trials. The best fiber condition was obtained and applied to the gas sensor. The results showed that the average diameter of fibers increased when the viscosity of the spinning solution increased, and the electric field distribution affected not only the fibers' thickness but also the range of fiber distribution on the collection plate. The experimental results present the best fiber diameter distribution when PVP content is 10 wt.% and the working voltage is 13 kV. After XRD and EDS examination, it was found that SnO2 could be crystallized at 550 °C and could produce a 63.5 % response to 10 ppm of hydrogen sulfide (H2S) at an operating temperature of 275 °C. This study, BaSnO3 perovskite material was used as the composite material for SnO2 gas sensors, and gas sensing tests were conducted. The experimental results showed that the SnO2/BaSnO3 composite material showed high stability at 255 ℃ when detecting 10 ppm of H2S.

摘要 i
Abstract ii
目錄 iv
圖目錄 viii
表目錄 xi
符號說明 xii
第一章 緒論 1
1.1. 前言 1
1.2. 研究動機與目的 5
第二章 基礎原理與文獻回顧 6
2.1. 金屬氧化物材料 6
2.2. 二氧化錫金屬氧化物材料 6
2.3. 鈣鈦礦材料 8
2.4.錫酸鋇鈣鈦礦結構 10
2.5. 靜電紡絲 12
2.5.1. 簡介及文獻回顧 12
2.5.2. 靜電紡絲種類 14
2.5.3. 影響因素 16
2.6. 氣體感測器 18
2.6.1. 簡介與文獻回顧 18
2.6.2. 半導體式氣體感測器 20
2.6.3. 響應數值計算方式 22
2.7. 電腦輔助工程 23
2.7.1. 簡介與文獻回顧 23
2.7.2. 計算流體力學 24
第三章 研究方法 25
3.1. 研究架構 25
3.2. 實驗藥品及設備 27
3.3. 紡絲模擬使用模組 28
3.4. 製程設備 29
3.4.1. 臥式奈米紡絲機 29
3.4.2. 磁力攪拌台 30
3.4.3. 精密烘箱與高溫爐 31
3.4.4. 精密天秤 32
3.5. 實驗分析儀器 33
3.5.1. 多功能環境場發掃描式電子顯微鏡 33
3.5.2. 高溫二維 X射線廣角繞射儀 (XRD) 34
3.5.3. 氣體感測設備 35
3.5.4. 鍍金機 36
3.6. 靜電紡絲分析流程 37
3.6.1. 研究與維度及分析模型 37
3.6.2. 物理與邊界條件 39
3.6.3. 網格定義 45
3.7. 氣體感測器指叉式電極製作 46
3.8. SnO2/BaSnO3複合薄膜製備 50
3.8.1. 紡絲溶液混和 50
3.8.2. 靜電紡絲 51
3.8.3. 複合薄膜 51
3.9. 氣體感測 52
第四章 結果與討論 53
4.1. 紡絲模擬結果 53
4.1.1. 不同PVP含量影響 53
4.1.2. 不同工作電壓 56
4.2. 紡絲實驗結果 58
4.2.1. 不同PVP含量紡絲實驗 58
4.2.2. 不同工作電壓紡絲實驗 61
4.3. 材料性質探討 64
4.3.1. SnO2金屬氧化物粉末XRD分析 64
4.3.2. SnO2纖維能量色散X光譜及素像分析 66
4.3.3. BaSnO3金屬氧化物粉末XRD分析 67
4.3.4. BaSnO3薄膜能量色散X光譜及素像分析 69
4.3.5. SnO2/BaSnO3纖維能量色散X光譜及素像分析 71
4.4. SnO2奈米纖維氣體選擇性測試結果 74
4.5. SnO2/BaSnO3複合材料氣體感測結果 76
4.5.1. 氣體選擇性 76
4.5.2. 工作溫度測試 78
4.5.3. 濃度測試 81
4.5.4. 連續性測試 84
4.6. 氣體感測器機制 85
4.7. 氣體感測器性質比較 88
第五章 結語 89
5.1. 結論 89
5.2. 未來展望 90
參考資料 91
個人簡歷 101

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