本研究以水熱法製備鉭酸鈉(NaTaO3)光觸媒材料，以NaOH及Ta2O5為前驅物，在200℃下進行水熱合成(時間分別為1、2、3、4、8、12h，合成之樣品分別標記為 1H、2H、3H、4H、8H、12H)，使用XRD及SEM等儀器分析材料之結構及表面特性，並探討這些材料對於有機染料降解及濕度感測之特性。
藉由改變合成時間的參數，發現顆粒隨著合成時間增加而變大，由XRD結構分析可以得到所製備的NaTaO3具有正交晶系的結構，同時發現樣品合成時間短有明顯殘存的Ta2O5，當合成時間增加則發現殘存Ta2O5變的不明顯，而NaTaO3結構特性則更加明顯。
有機染料之降解特性以UV燈照射5小時，樣品4H之降解率可以達到99%，以白光LED燈照射5小時，樣品4H之降解率仍然可以達到95%，樣品8H及12H應有較厚的NaTaO3外殼同時發現其降解效率較差。
將鉭酸鈉樣品粉末披覆在指叉狀電極製作成元件。樣品4H的感測元件在95%濕度有良好的響應時間5s及回復時間16s。樣品4H相較於樣品8H和12H擁有較良好的光催化及濕度感測效應。

In this study, NaTaO3 photocatalyst materials were prepared by hydrothermal method. Hydrothermal synthesis was carried out at 200 °C using NaOH and Ta2O5 as precursors for 1, 2, 3, 4, 8 and 12 h, and labeled as 1H, 2H, 3H, 4H, 8H, and 12H, respectively. XRD and SEM were used to characterize structure and morphology of samples. Humidity and organic-dye-degradation properties of these materials were also analyzed in this work.
By changing the parameters of the synthesis time, it is found that the particles become larger as the synthesis time increases. From XRD structural analysis the prepared NaTaO3 samples have the orthorhombic structure. The residual Ta2O5 is obvious in sample(for a shorter synthesis time). When the synthesis time increases, it is found that the residual Ta2O5 is obviously decreased.
The organic-dye-degradation characteristic of sample 4H for 5 hours using UV lamp can reach 99%, and using white LED light it can still reach 95%. The sample 8H and 12H with thicker shell of NaTaO3 were found to have lower degradation rates.
Humidity devices were made by pasted the NaTaO3 powder on interdigitated electrodes. The sensing element of sample 4H reveals a good response time of 5s and recovery time of 16s at 95% humidity. In this work, the sample 4H has better photocatalytic and humidity sensing effects.

摘 要 i
ABSTRACT ii
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 ix
第一章 緒論 1
1-1 前言 1
第二章 文獻回顧與研究動機 2
2-1 研究目的與動機 2
2-2 光觸媒 3
2-2-1 光觸媒簡介 3
2-2-2 光催化原理 3
2-3 核殼結構 4
2-4 材料介紹 5
2-4-1 鉭酸鈉(NaTaO3)介紹 5
2-5 合成方法 5
2-5-1 固態燒結法 5
2-5-2 溶膠凝膠法 6
2-5-3 水熱法 6
2-5-4 水熱法特點 6
第三章 實驗方法與步驟 7
3-1 實驗材料 7
3-2 量測儀器 7
3-3 實驗儀器 8
3-4 實驗流程及方法 9
3-4-1 水熱法備製鉭酸鈉光觸媒材料 9
3-4-2 製備感測器 11
3-4-3 光催化實驗步驟 12
3-4-4 濕度感測實驗 13
3-5材料特性量測原理與分析 14
3-5-1 X-ray繞射儀 (X-ray Diffractometer, XRD) 14
3-5-2 場發射掃描式電子顯微鏡 (Field Emission Gun Scanning Electron Microscopy, FE-SEM) 15
3-5-3 場發射穿透式電子顯微鏡 (Field Emission Gun Transmission Electron Microscope, FE-TEM) 15
3-5-4 光催化降解 15
3-5-5 紫外光/可見光光譜儀 (UV-Visible Spectroscopy) 16
3-5-6 交流阻抗法測試(AC Impedance, EIS) 17
第四章 結果與討論 20
4-1 材料分析 20
4-1-1 XRD結構分析 20
4-1-2 掃描式電子顯微鏡(SEM)分析 23
4-1-3 場發射穿透式電子顯微鏡(TEM)分析 24
4-1-4 紫外光/可見光光譜儀(UV-Visible Spectroscopy)分析 25
4-1-5 比表面積與孔隙度(BET)分析 25
4-2 光催化特性探討 26
4-3 感測器實驗及探討 28
4-3-1 濕度感測 28
第五章 結論 31
參考文獻 32

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