Significant progresses have been made toward the understanding of graphene growth on metal substrates via chemical vapor deposition method. Cu and Ni are the most studied catalysts for producing high‐quality graphene. Among the transitional metal group, Fe also has the potential as a substrate for growth of graphene. However, the complexity of phase transformation in Fe and the thermodynamically preferable formation of iron carbide at the ambient temperature limit extensive use of Fe for graphene growth. Herein, the concurrent formation of graphene and Fe₃C by optimizing the growth time and cooling rate in graphene growth on Fe substrate is reported. Also, the influence of Fe phases (ferrite and austenite) on the graphene growth is studied. Graphene grain growth on Fe substrate is observed via ultrahigh temperature confocal microscope. The in situ observation confirms that graphene grains are grown around the Fe grain boundaries during the cooling process. The systematic study provides a profound insight into graphene growth on Fe substrate and thus paves a way toward development of graphene‐based steel products for various applications.

中文翻译：

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控制渗碳工艺获得石墨烯-Fe3C-Fe复合材料

通过化学气相沉积法在理解石墨烯在金属基底上的生长方面已经取得了重大进展。铜和镍是生产高质量石墨烯的研究最多的催化剂。在过渡金属基团中，Fe还具有作为石墨烯生长底物的潜力。然而，Fe中相变的复杂性以及在环境温度下热力学上优选的碳化铁的形成限制了Fe在石墨烯生长中的广泛使用。在此，同时形成石墨烯和Fe ₃据报道，通过优化Fe基体上石墨烯生长的生长时间和冷却速率可得到C。此外，研究了铁相（铁素体和奥氏体）对石墨烯生长的影响。通过超高温共聚焦显微镜观察到石墨烯在铁基体上的生长。原位观察证实，在冷却过程中，石墨烯晶粒在Fe晶界周围生长。这项系统的研究提供了对在Fe基体上石墨烯生长的深刻见解，从而为开发用于各种应用的石墨烯基钢产品铺平了道路。