Physical Chemistry, Institute of Chemistry, Chemnitz University of Technology, Strasse der Nationen 62, 09111, Chemnitz, Germany.
Anal Bioanal Chem. 2010 Mar;396(5):1913-9. doi: 10.1007/s00216-010-3470-9. Epub 2010 Feb 4.
Layers of alumina were deposited on to bundled carbon fibers in an atomic layer deposition (ALD) process via sequential exposure to vapors of aluminium chloride and water, respectively. Scanning electron microscopic (SEM) images of the coated fibers revealed that each individual fiber within a bundle was coated evenly and separately, fibers are not bridged by the coating. SEM and transmission electron microscopic (TEM) images indicate that the coating was uniform and conformal with good adhesion to the fiber surface. Average deposition rate, measured from SEM images, was 0.06 nm per cycle at 500 °C. SEM also revealed that at deposition temperatures of 500 °C few of the fibers were damaged. At temperatures of 300 °C, no damaged fibers were observed, the average deposition rate decreased down to 0.033 nm per cycle. Oxidation resistance of the alumina-coated fibers was characterized by thermogravimetric analysis (TGA). The alumina coating improved oxidation resistance of the carbon fiber significantly. Oxidation onset temperature was 600 °C for fibers coated with a 45 nm thick alumina. Uncoated fibers, on the other hand, started to oxidize at temperatures as low as 250 °C.
在原子层沉积（ALD）过程中，通过分别顺序暴露于氯化铝和水的蒸气，在束状碳纤维上沉积氧化铝层。涂覆纤维的扫描电子显微镜（SEM）图像显示，束中的每根纤维都被均匀地单独涂覆，纤维之间没有涂层桥接。SEM 和透射电子显微镜（TEM）图像表明，涂层均匀且与纤维表面具有良好的附着力。从 SEM 图像测量的平均沉积速率为 500°C 时每循环 0.06nm。SEM 还表明，在沉积温度为 500°C 时，很少有纤维受损。在 300°C 的温度下，没有观察到受损的纤维，平均沉积速率下降到每循环 0.033nm。氧化铝涂层纤维的抗氧化性通过热重分析（TGA）进行了表征。氧化铝涂层显著提高了碳纤维的抗氧化性。对于涂覆有 45nm 厚氧化铝的纤维，氧化起始温度为 600°C。另一方面，未涂层的纤维在低至 250°C 的温度下开始氧化。
