本研究目的在製備不同形貌之二氧化錫一維奈米結構。利用化學沉積法，經由調控不同的時間、壓力、溫度等實驗參數，影響或改變奈米結構生長的機制及最後生長的形貌。本研究中已合成的奈米結構包含具分枝狀的奈米線(SnO2 nanowires with branched structure)、奈米棒(SnO2 nanorods)、頂端具一次轉折之奈米線(hockey-like SnO2 nanowires)、奈米水草(waterweed-like SnO2 nanowires)。上述奈米結構是以矽作為基板，金作為觸媒所成長。另外我們亦嘗試以氧化鋁作基板，鈦作為觸媒成長二氧化錫奈米結構，經SEM觀察，有二氧化錫奈米線及奈米帶(nanobelts)的生長。為了解奈米結構的生長情形，TEM、SEM、X-Ray、EDS等分析鑑定儀器也在本研究中使用。除了探討不同二氧化錫奈米結構的生長情形外，我們針對具分枝狀奈米線及奈米水草做其他性質的分析。本研究所做的分析包含螢光光譜分析、場發射性質分析，以及對一氧化碳和乙醇的氣體感測分析。分析結果顯示這兩種奈米結構都有很好的發光及場發射性質，而在氣體感測的試驗中，奈米水草因具有較高的比表面積而對一氧化碳和酒精有較好的感測靈敏度。

Various SnO2 1-D nanostructures were synthesized by adjusting the experimental parameters. We have successfully synthesized the hockey-like SnO2 nanowires under ambient pressure; waterweed-like SnO2 nanowires by a two-step process; SnO2 nanowires and nanorods were synthesized under different working temperatures; moreover, SnO2 nanowires with different included angles were also synthesized. SnO2 nanostructures on the silicon substrate with Au as catalyst have been synthesized. However, we have also synthesized SnO2 nanowires on Al2O3 by using Ti as catalyst. In addition to the VLS mechanism, various growth mechanisms of the SnO2 1-D nanostructures were also discussed, such as Ostwald ripening.
Furthermore, we have focused on the properties and applications of these SnO2 nanostructures. SnO2 nanowires with branched structures and waterweed-like SnO2 nanowires were compared in terms of optical properties, field emission tests, and gas senor tests. These two SnO2 nanostructures show good properties in field emission tests, and good field-enhancement factor β (βH=4054.37 in SnO2 nanowires with branched structures; βH=2086.92 in waterweed-like SnO2 nanowires). In gas sensor tests, the sensitivity of waterweed-like SnO2 nanowires is superior to SnO2 nanowires with branched structure on detecting CO and C2H5OH owing to higher surface-to-volume ratio of waterweed-like SnO2 nanowires.

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