具不同尺寸奈米圖騰藍寶石基板對於可見光光觸媒氧化鉍之影響 (2024)

本研究所採用的基板為藍寶石，將其經由表面處理後，使基板表面具有奈米圖騰化，再與可見光光觸媒氧化鉍作結合，而此奈米圖騰能將氧化鉍奈米化達到提升光催化效果，且對於未來藍寶石基板在光學應用上，除了能保有基板透光性也能達到除汙、抗菌等光觸媒之效果。首先，在表面處理過程中，我們利用射頻濺鍍機，在藍寶石基板上獲得良好的附著性及表面平坦的純鋁薄膜，並透過陽極處理，得到具有奈米孔洞陣列結構之陽極氧化鋁薄膜(AAO)的藍寶石基板，接著再以不同濺鍍時間，將金屬鉍與具有AAO複合膜的藍寶石基板作結合，為了使金屬鉍具有光催化效果，利用高溫爐將其氧化成氧化鉍(Bi2O3)。由於，具有奈米孔洞陣列結構之藍寶石基板，使得氧化鉍的比表面積增加，當氧化鉍光觸媒受到光能照射後，產生更多電子電洞對，能誘發更佳化之光催化效果。實驗結果分析中，利用場發射掃描式電子顯微鏡(Field Emission Scanning Electron Microscope，FE-SEM)，觀察複合層基板之微觀結構變化；再利用紫外光-可見光光譜儀(UV-VIS)測得經由表面處理藍寶石基板的透光度；且將試片放入甲基橙降解液中，由降解濃度變化可知，具較大尺寸奈米圖騰之複合藍寶石基板，其光催化效果較佳，並且保有一定的可見光穿透率，預期未來具有應用在日常生活中的潛力。

In this study, we used the sapphire substrate with nanopattern to nanonize the photocatalyst bismuth oxide, and achieved the purpose of improving the photocatalytic effect of the Bi2O3. We expected that the sapphire will be used in optical applications in the future, it can maintain the transmittance of the sapphire also achieve the effects of photocatalyst. First, in the surface treatment process, we used the Radio Frequency sputter to obtain the aluminum film with good adhesion and flat surface on the sapphire substrate. And through anodizing, the substrate with anodized aluminum oxide (AAO) film with a nano-hole array structure was obtained, and we set the different sputtering time, the bismuth particle was combined with the sapphire substrate with the AAO composite film. In order to make the Bi particle had the better photocatalytic effect, it was oxidized into Bi2O3 using a high-temperature furnace. Increasing the specific surface area of Bi2O3 because of the sapphire substrate had the nanostructure. More electron-hole pairs were generated which could induce a better photocatalytic effect when the Bi2O3 photocatalyst was irradiated with light energy. In the analysis, the Field Emission Scanning Electron Microscope (FE-SEM) was used to observe the microstructure of the composite layer substrate. And then, we used the Ultraviolet–visible spectroscopy (UV-VIS) to measure the transmittance of composite layer sapphire substrate. Finally, we put sample into the degradation solution which was methyl orange (MO). It could be observed from the change of degradation concentration, the composite sapphire substrate with a larger size nanopattern had better photocatalytic effect and maintained the transmittance of visible light. It is expected to have the potential to be applied in daily life in the future.

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