School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, South Korea.
Microsc Microanal. 2013 Aug;19 Suppl 5:202-6. doi: 10.1017/S143192761301266X.
The oxidation mechanism and thermal stability of nickel oxide (NiO)/carbon nanotube (CNT) composites were investigated by examining composites with different NiO contents by thermogravimetric analysis and transmission electron microscopy (TEM). NiO acts as a catalyst in the oxidation of CNT in the composite. CNTs can be oxidized, even in a vacuum, by reducing NiO to nickel at temperatures lower than the normal oxidation temperature of CNTs. This phase transition was confirmed directly by in situ heating TEM observations. In air, reduction by CNT occurs simultaneously with reoxidation by gaseous O₂ molecules, and NiO maintains its phase. The thermal stability decreased with increasing NiO content because of defects in the CNT generated by the NiO loading.
通过热重分析和透射电子显微镜（TEM）研究了具有不同 NiO 含量的复合材料，研究了氧化镍（NiO）/碳纳米管（CNT）复合材料的氧化机理和热稳定性。NiO 在复合材料中 CNT 的氧化中起到催化剂的作用。在低于 CNT 正常氧化温度的温度下，NiO 还原为镍，CNT 就可以被氧化，即使在真空中也是如此。这种相变通过原位加热 TEM 观察得到了直接证实。在空气中，CNT 的还原与气态 O₂分子的再氧化同时发生，NiO 保持其相态。随着 NiO 含量的增加，由于 NiO 负载产生的 CNT 缺陷，复合材料的热稳定性降低。
