【摘要】 近年来石墨烯导热膜在高性能手机等电子产品里获得了广泛的应用。通过加热的方式还原氧化石墨烯是一种被应用于石墨烯导热膜批量制备的商业方法，但其原子尺度上的结构演化过程并不很清楚。本文利用球差校正扫描透射电镜原位观测了氧化石墨烯在加热条件下还原的微观结构演化，结果表明，氧化石墨烯在还原初期会释放大量气体从而形成丝状网络结构，且层间距会随着还原进程而减小，经过高温石墨化的还原氧化石墨烯能够具有稳定的结构。本论文的研究揭示了氧化石墨烯在还原过程的微观结构演化，为指导优化还原氧化石墨烯基导热膜的制备和应用提供了有参考价值的信息。更多还原

【Abstract】 Graphene thermal films are widely used in electronic devices, such as cell phone, due to their ultrahigh thermal conductivity. Heating-induced reduction of graphene oxide is a common commercial method for bulk production of these films. However, the atomic-scale mechanisms behind the structural evolution during the reduction process remain largely unexplored. In this study, we use aberration-corrected scanning transmission electron microscopy(STEM) to observe the microstructural evolution of graphene oxide during in-situ heating. Our findings showed that, upon initial reduction, graphene oxide formed a filamentous network structure due to the release of substantial gas. Additionally, the interlayer spacing decreased progressively as reduction proceeded. When subjected to high-temperature graphitization, the reduced graphene oxide retained a stable structure. This study provides key insights into the structural evolution during the reduction of graphene oxide, offering valuable guidance for optimizing the fabrication of graphene thermal films.更多还原