臺灣博碩士論文加值系統

本實驗以兩階段合成法製備CuO-V2O5奈米異質結構，第一階段先藉由水熱法合成出V2O5奈米線，第二階段再利用濕式化學法將CuO奈米顆粒鑲嵌於V2O5奈米線上。藉由中斷實驗，我們仔細觀察V2O5奈米線在實驗過程中結構的演變並討論它的成長機制。實驗中合成產物的形貌、結構及組成將使用SEM、XRD、TEM儀器觀察與分析。此外也將這兩種奈米線製作成氣體感測元件並對CO與NO2氣體做感測。結果顯示，V2O5奈米線的成長是藉由OA(oriented attachment)的機制成長。先在溶液中成核形成顆粒，再成長為棒狀結構，藉著旋轉尋求表面能最低的位置而結合，最後再沿著[110]異向生長成V2O5奈米線。在氣體感測特性方面，較高溫時能夠藉由熱活化的作用，增強奈米線氣感元件對待測氣體的感測能力。另外，CuO-V2O5奈米異質結構因為具有p-n junction以及較大的比表面積，相較之下會比純的V2O5奈米線有更優相的感測能力。

In this experiment, CuO-V2O5 heterogeneous nanostructures was synthesized by a two-stages chemical process where V2O5 nanowires were synthesized by using a hydrothermal method in the first stage, and then CuO nanoparticles were decorated on the surface of V2O5 nanowires through wet-chemical reaction in the second stage. The morphologies. compositions, and crystalline structures of the as-synthesized products were characterized by SEM, XRD, and TEM. To study the growth mechanism of V2O5 nanowires, the synthesis process was terminated at different growth times and the corresponding morphologies and structures were examined. Gas sensors based on V2O5 nanowires and CuO-V2O5 heterogeneous nanostructures were fabricated to investigate their gas sensing properties to CO and NO2 gases.

The experimental results show that the growth mechanism of V2O5 nanowires is deduced to be the oriented attachment (OA) mechanism. The V2O5 nanoparticles will first nucleate in the precursor solution and then grow into nanorods. In the meantime, the growing nanorods will rotate each other to find the orientation with the lowest surface energy and attach together to from V2O5 nanowires oriented along the [110] direction. At the aspect of gas sensing properties, the gas sensitivities of the V2O5 nanowires can be enhanced as the operation temperature is increase due to the thermal activation effect. The CuO-V2O5 heterogeneous nanostructures have a better gas sensing performance than the bare V2O5 nanowires because of their larger surface-to-volume ratios and the existence of extra p-n junctions.

中文摘要 I
Abstract II
目次 III
圖目次 IV
表目次 VI
第一章 緒論 1
第二章 文獻回顧 2
2.1 氣體感測器 2
2.2 金屬氧化物半導體氣體感測機制 3
2.3 金屬氧化物半導體氣體感測器發展與目前遭遇的問題 4
2.4 五氧化二釩(vanadium pentoxide) 7
2.5 一維五氧化二釩奈米結構製備 8
2.6 氧化銅(Copper oxide) 11
2.7 鑲嵌於一維奈米材料的氧化銅奈米顆粒製備 12
2.8 研究動機與目的 14
第三章 實驗步驟 15
3.1 實驗設計 15
3.2 合成方法 16
3.2.1 V2O5奈米線制備 16
3.2.2 合成CuO decorate V2O5奈米線 16
3.3 材料特性分析 17
3.4 氣體感測元件製作與特性之量測 18
第四章 結果與討論 20
4.1 V2O5奈米線合成 20
4.1.1 溫度的影響 20
4.1.2 V2O5濃度之影響 25
4.1.3 V2O5奈米線成長機制 26
4.2 CuO-V2O5奈米異質結構 30
4.3 氣體感測特性 34
4.3.1 NO2 氣體感測特性 34
4.3.2 CO氣體感測特性 37
第五章 結論 39
參考文獻 40

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