MXenes are a class of two-dimensional materials with potential applications in the fields such as thermal management and high-temperature materials. In this study, the transitions of Ti3C2Tx MXene are investigated during thermal annealing via x-ray photoelectron spectroscopy and two-dimensional correlation spectroscopy. The thermal evolution of MXene samples occurs as two distinct processes in different temperature regions: process I (from 25 to 500 °C) and process II (from 500 to 777 °C). In process I, the terminal groups of MXene are reduced, and fluorine (–F) terminal groups are released. Four different pathways are identified with C–Ti–O and C–C as probable final products. In process II, the reaction resulting in the removal of –F species and decomposition of the Ti3C2 region in the MXene is observed. These results provide insight into the thermal decomposition behavior of Ti3C2Tx MXene, which can assist in the design of MXene-based materials with specific functionalities.

中文翻译：

---

使用 XPS 和二维相关光谱跟踪 Ti3C2TX MXene 的热动力学

MXenes是一类二维材料，在热管理、高温材料等领域具有潜在的应用前景。在这项研究中，通过 X 射线光电子能谱和二维相关光谱研究了 Ti3C2TX MXene 在热退火过程中的跃迁。MXene 样品的热演化在不同温度区域以两个不同的过程发生：过程 I（从 25 到 500 °C）和过程 II（从 500 到 777 °C）。在过程 I 中，MXene 的末端基团被还原，氟 (-F) 末端基团被释放。确定了四种不同的途径，其中 C-Ti-O 和 C-C 可能是最终产物。在过程 II 中，观察到导致去除 –F 物质和 MXene 中 Ti3C2 区域分解的反应。