本論文是就奈米半導體光觸媒的合成與應用做相關研究，以某n型半導體當作載體，外層再覆上p型半導體，以形成p-n界面的複合材料。應用面上的測試採取兩大方向，一為水溶液相的有機物染料裂解及有害金屬鉻離子還原作探討，二為光觸媒抑菌效果的探討。
驗證複合光觸媒功能所採用的儀器分析包含結構分析: XRD、XPS；圖像分析: SEM、HR-TEM；光學分析: UV-VIS、PL，可得知其半導體能隙、不同光波長的吸收度等資訊。
應用面上，進行五種不同的染料的測試，包含AB 1、MB、EY、RHB、MO。五種染料分別在可見光及紫外光下進行氧化裂解測試，結果呈現p-n junction的複合材料效果最為突出；也用重金屬鉻離子配合其顯色劑1,5-二苯基二氨脲來測試光觸媒的還原性，結果呈現n型半導體還原性較為良好；最後用大腸桿菌當作菌源來測試光觸媒在照光下(可見光)及暗室下的抑菌效果，發現到本光觸媒殺菌效果驚人，即使在暗室下仍有強抗菌能力，且可以證實相同光觸媒材料下照光的光觸媒抑菌效果比暗室中更為突出。

The thesis is focused on research of synthesis and application of composite-type nano-semiconductor photocatalysts. By using n-type semiconductor as a substrate or carrier, we deposited p-type semiconductor on the surface of n-type semiconductor to form the coupled photocatalytic material.
The applications of this coupled photocatalytic material are involed in two ways, one is to degrade the organic dye solution and to reduce heavy metal chromium ion in solution, and the other is to test effectiveness of its anti-bacteria.
Several instruments used to confirm the coupled catalystic material are XRD and XPS for structural analysis, SEM and HR-TEM for image analysis, and UV-VIS and PL for optical analysis. Therefore, we can acquire some information like bandgap and the light absorption capability.
For application considerations, the first test is to do photo-degradation test with five different dyes under both visible and UV light. It was found that the coupled improved the dye photodegradation. The second test is about the reduction test of chromium ion under both visible and UV light. The data indicated that n-type semiconductor had the stongest ability in reducing chromium ion. The final test is to execute the anti-bacteria test with photocatalyst under visible light and in the dark. We observed that photocatalyst particle was quite effective to inhibit E. coli even without light. Overall, our photocatalyst under light showed much better ability to suppress bacteria than in the dark.

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