Composite particles of carbon nanotubes (CNTs) and titanium dioxide (TiO2) were prepared by a sol-flux method. Characterization of TiO2/CNTs nanocomposite was performed by X-ray powder diffraction (XRD), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The results show that TiO2 nanocrystals (mixed anatase and rutile) are successfully deposited on the surface of CNTs, forming a granular coating with a thickness of about 2 nm. It is possible that the growth of TiO2 on the surface of CNTs is implemented by anchoring TiO2 through hydroxyl and carboxylic functional groups. In the presence of TiO2/CNTs nanocomposite, the peak temperature of the high-temperature decomposition of ammonium perchlorate (AP) decreased by 52.5 °C, better than other samples including the one of simply mixed TiO2 and CNTs. The catalytic influence is evident even with 1% catalyst concentration. The thermal kinetic constant for the catalytic decomposition of AP is computed using model free (isoconversional) Flynn–Wall–Ozawa approach. It shows that although the two exothermic decomposition peaks merged into one, the low-temperature decomposition stage still exists, and accounts for about thirty percent of the whole reaction.

中文翻译：

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TiO2/CNTs纳米复合材料的制备及其对高氯酸铵热分解的催化性能

碳纳米管 (CNTs) 和二氧化钛 (TiO2) 的复合颗粒是通过溶胶通量法制备的。通过 X 射线粉末衍射 (XRD)、透射电子显微镜 (TEM) 和 X 射线光电子能谱 (XPS) 对 TiO2/CNTs 纳米复合材料进行表征。结果表明，TiO2纳米晶（混合锐钛矿和金红石）成功沉积在CNT表面，形成约2nm厚的颗粒状涂层。TiO2 在 CNTs 表面的生长可能是通过羟基和羧基官能团锚定 TiO2 来实现的。在 TiO2/CNTs 纳米复合材料的存在下，高氯酸铵 (AP) 的高温分解峰值温度降低了 52.5°C，优于其他样品，包括 TiO2 和 CNTs 的简单混合之一。即使催化剂浓度为 1%，催化影响也很明显。AP 催化分解的热动力学常数使用无模型（等转化）Flynn-Wall-Ozawa 方法计算。表明虽然两个放热分解峰合二为一，但仍存在低温分解阶段，约占整个反应的百分之三十。