本論文以奈米半導體光觸媒的合成與應用進行相關研究，以氧化鋅n型半導體當作載體，外層覆上p型半導體氧化銀，形成p-n界面的奈米複合材料，以X-ray繞射儀(XRD)分析材料的結構及結晶性；場發射掃描式電子顯微鏡（FESEM）觀察材料的表面形態；能量分散式光譜儀(EDS)半定量分析材料組成元素之含量變化。光學性質量測採用傅里葉轉換紅外光譜(FTIR)檢測材料內化合物鍵結種類，以紫外光/可見光吸收光譜儀（UV-Vis spectrometer）檢測材料吸收率與能隙。
在抗菌試驗上，菌種選用大腸桿菌(E. coli)與金黃色葡萄球菌(S. aureus)。抗菌效果最好的為奈米片狀ZnO披覆5 wt%Ag2O，其對大腸桿菌抗菌結果上，無論在暗室或亮室環境下，第一個小時均達到完全無菌；對於金黃色葡萄球菌抗菌結果，於3小時後暗室環境下，殺菌率達99.99%以上，亮室環境下經過3小時後，則完全滅菌，證實相同觸媒材料，在照光下的抗菌效果比暗室下更為優異。最後以奈米片狀ZnO披覆5 wt%Ag2O進行染料光催化裂解試驗，發現於可見光與紫外光照射下對於MB染料具有光催化裂解能力，並可多次循環使用。

In this research, the synthesis and application of nano-semiconductor photocatalysts are studied. The n-type zinc oxide semiconductor is used as a carrier, and the outer layer is coated with p-type silver oxide semiconductor nanoparticles to form a composite material with many p-n nano-diodes. The structure and crystallinity of the material was analyzed by XRD (X-ray diffractometer); the surface morphology of the material was observed by FESEM (Field emission scanning electron microscopy); the content of the constituent elements of the material was semi-quantitatively analyzed by EDS (Energy dispersive spectrometer). The optical property measurement by FTIR (Fourier transform infrared spectroscopy) to detect the compound bond type and the UV-Vis spectrometer to detect the absorption behavior and band gap in the material.
In the antibacterial test, two kinds of strains from E. coli and S. aureus were selected. The best antibacterial effect came from the ZnO nano-sheets coated with 5 wt% Ag2O. For the antibacterial test of E. coli, it was completely bactericidal in the dark and bright conditions for the first hour. For the antibacterial test of S. aureus, it took for three hours to have the sterilization efficiency over 99.99% in a dark condition, but it was 100% in a light illuminating condition. Here we confirmed that the antibacterial effect with the same catalyst material under the light-illuminating condition was better than under the dark. Finally, the photocatalytic degradation test of the dye was also carried out with the excellent ZnO nano-sheets coated with 5 wt% Ag2O. Under the visible light and UV light, it was found that this composite photocatalyst was able to degrade the MB dye and to be re-used for several runs.

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