Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10698
標題: 水熱法合成二氧化鈦一維奈米結構與其光觸媒特性的探討
Synthesis of TiO2 one-dimensional nanostructures by Hydrothermal process and their photocatalytic properties
作者: 朱哲武
Chu, Che-Wu
關鍵字: Titanium dioxide nanowires;二氧化鈦奈米線;ydrothermal treatment;Titanium dioxide photocatalysis;水熱處理;二氧化鈦光觸媒
出版社: 材料科學與工程學系所
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摘要: 
本研究將商業化鈦片置於一莫耳的氫氧化鈉或氫氧化鉀(強鹼)溶液中,經水熱法處理後再以鹽酸酸洗, 鍛燒後可在原有的鈦片上合成大量的銳鈦礦相二氧化鈦奈米線. 在水熱過程中, 鈦片表面會被強鹼溶液腐蝕,所以鈦片表面的粗糙度對生成二氧化鈦奈米線的並無扮演重要的角色. 另外, 添加0.1M 的氫氧化鉀混合在氫氧化鈉溶液中做水熱處理, 可以提高二氧化鈦奈米線的整齊排列. 經由水熱過程, 可以看到鈦酸奈米管的形成過程, 先形成奈米片狀物再捲成多層奈米管, 再經酸洗鍛燒可以將含鈉的鈦酸奈米管轉成含氫的鈦酸奈米管,最後轉成二氧化鈦奈米線. 鍛燒可提高結晶性, 最後做UV的甲基藍降解量測, 銳鈦礦相的二氧化鈦奈米線光觸媒效率比銳鈦礦相二氧化鈦薄膜更優越。

The anatase titanium dioxide nanowires on the titanium foil are prepared from hydrothermal treatment on commercial Ti foil in 1M NaOH or KOH followed by HCl washing and post-annealing processes. During the hydrothermal process, Ti foil surface will be etched by alkaline solution so that the roughness of Ti foil doesn't play an important role to help TiO2 nanowires growth. In addition, 0.1M KOH additive in NaOH solution can better the alignment of TiO2 nanowires. All the formation process of sodium titania nanotubes will be in hydrothermal process. Namely, it will form nanosheets first and turn into roll-up nanosheets (nanotubes). Then, sodium titania nanotubes become hydrogen titania nanotubes during HCl washing. Finally, hydrogen titania nanotubes will transform into TiO2 nanowires. Post annealing process can better its crystallinity. In the end, with the Methylene Blue (MB) degradation by UV, anatase TiO2 nanowires on photocatalytic efficiency is superior than anatase TiO2 film.
URI: http://hdl.handle.net/11455/10698
Appears in Collections:材料科學與工程學系

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