無紫外光下的抑菌-可見光奈米光觸媒研發

科展類別
臺灣國際科展
屆次
2005年
科別
環境科學
學校名稱
國立臺南第一高級中學
作者
潘家弘
關鍵字
紫外光,奈米

摘要或動機

In this experiment, we hope to produce appropriate-sized nano particles of by using the chitin. By mixing the particles with the metal of Ti, Fe and Zn of proper proportions and therefore narrow their band gaps. Thus, the Bacteriostasis of LightPhotocatalysts could appear under the environment where the energy is lower than ultraviolet ray. We use de-acetylated chitin in three ways -- chelating agent, surfactant and protecter. Then we put a thin layer of the mixture of chitin and metal nano particles on a piece of glass, and afterwards, sintering the mixture on the glass. Next, we scan the surface of the glass with AFM(Atomic Force Microscopy) to measure its particle size. The result we got showed that the surface-roughness of the Ti-Fe nano particles was 30.642nm, the best solution of all the samples. Yet, in this experiment, Fe was not suitable. Therefore we should choose the sample of Ti-Zn mixture, which is slightly smaller in roughness. According to the result we got from the experiment, we found that, under the yellow light, the survivable strain-number ratio of the sintered Ti-Fe-Zn mixture on the glass and empty glass was 0.09±0.06. This was much better than the survivable strain-number ratio of 0.17±0.06, the result we got out from the glass of pure Ti and empty glass. From the measurement, we found that the proportion of mixture could lower the excitation energy Ti needs. Through this experiment, we hope to create a layer of film containing nano particles, and by applying it to daily-use products, we could prevent harmful bacteria. 本實驗的目的,就是希望可以利用幾丁質製作出適當粒徑大小的金屬奈米顆粒,混合適當比例的鈦、鐵、鋅金屬,使其能隙變窄,讓我們能在低於紫外光能量的光譜下,產生奈米光觸媒的抑菌效果。筆者在實驗中利用去乙醯化之幾丁質在本實驗中扮演三種角色:螯合劑、介面活性劑及保護劑,以將幾丁質與金屬奈米顆粒均勻塗抹於玻璃上,並以燒結玻璃的方式進行實驗。並且利用AFM掃描玻璃表面,確認其表面尺度,驗證的結果Ti-Fe混合比例的奈米顆粒之表面粗糙度為30.642nm,為最佳狀態,但在本實驗中Fe並不適用,故應以粗糙度僅次於Ti-Fe的Ti-Zn混合比例為主。根據實驗的結果,在綠光下,混合比例的Ti-Fe-Zn玻璃與空白玻璃的菌落數比,菌落存活率為0.09±0.06,相較於純Ti的0.17±0.06來的低,代表混合比例可降低Ti所需之激發能量。經過此實驗未來筆者希望可以以幾丁質製作出一層含奈米顆粒的薄膜,應用到各種生活用品防止細菌的危害。


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