Effects of atomic oxygen on titanium dioxide thin film
Effects of atomic oxygen on titanium dioxide thin film
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DOI：
10.1016/j.actaastro.2018.02.024
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发表时间：
2018-05-01
影响因子：
3.5
通讯作者：
Sakama, Hiroshi
中科院分区：
文献类型：
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作者：
Shimosako, Naoki;Hara, Yukihiro;Sakama, Hiroshi
在近地轨道(LEO)中，原子氧(AO)已被证明会导致用于航天器的有机材料的降解。与其他金属氧化物如SiO_2、Al_2O_3和ITO一样，二氧化钛具有保护有机材料的潜力。本研究采用溶胶凝胶法制备了锐钛矿型二氧化钛薄膜，并对其进行了紫外光辐照。通过质量变化、扫描电子显微镜(SEM)、原子力显微镜(AFM)、X射线光电子能谱(XPS)、X射线衍射仪(X射线衍射仪)、透射谱和光催化活性等测试手段，比较了光催化氧化前后二氧化钛的性能。结果表明，二氧化钛薄膜几乎不受腐蚀，具有较好的抗氧化性。研究表明，氧化只影响二氧化钛薄膜的表面，而不影响薄膜的整体。在紫外光照射下，二氧化钛薄膜发生轻微的氧化。然而，这些变化是非常小的。尽管光催化活性略有下降，但TiO2光催化活性仍保持不变，这表明TiO2光催化薄膜在消除航天器材料产生的污染物方面具有很好的应用前景。
In low earth orbit (LEO), atomic oxygen (AO) has shown to cause degradation of organic materials used in spacecrafts. Similar to other metal oxides such as SiO2, Al2O3 and ITO, TiO2 has potential to protect organic materials. In this study, the anatese-type TiO2 thin films were fabricated by a sol-gel method and irradiated with AO. The properties of TiO2 were compared using mass change, scanning electron microscope (SEM), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmittance spectra and photocatalytic activity before and after AO irradiation. The results indicate that TiO2 film was hardly eroded and resistant against AO degradation. AO was shown to affects only the surface of a TiO2 film and not the bulk. Upon AO irradiation, the TiO2 films were slightly oxidized. However, these changes were very small. Photocatalytic activity of TiO2 was still maintained in spite of slight decrease upon AO irradiation, which demonstrated that TiO2 thin films are promising for elimination of contaminations outgassed from a spacecraft's materials.