【作者】 曾梦琪； 谭丽芳； 王娇； 陈林锋； 付磊；

【Author】 Mengqi Zeng;Tan;Wang;Chen;Fu;College of Chemistry and Molecular Science,Wuhan University;

【机构】 化学与分子科学学院,武汉大学；

【摘要】 我们发现仅需将生长温度提至催化剂熔点之上,即可十分容易地在一个很大的生长窗口下制备高质量的均匀单层石墨烯。以常用的石墨烯生长催化剂铜为例,与固态铜体相中的低碳含量不同,我们发现液态铜体相中能包埋大量的催化裂解的碳原子。在液态冷却的过程中,固化的表面是由准原子级平整的液态表面演化而来,故而极端平滑,能从中获得低缺陷的均匀单层石墨烯,而在表层之下的额外的碳原子会由于表层金属晶格的固化而被牢牢地锁于体相中,即其下的液相充当了一个缓冲剂,故而在液态铜上的石墨烯生长严格遵循了表面自限制效应,并且具有极大的可控制备均匀单层石墨烯的窗口。更为重要的是,我们发现不仅是铜,其他液态金属(如镓、铟)也有类似的现象。使用液态金属无需复杂的基底前处理和精确的生长参数控制,即可简便地在大窗口下制备大面积高质量的石墨烯膜。更多还原

【Abstract】 We obtain uniform monolayer graphene of high quality easily at a large growth window only by increasing the temperature to the melting point of the catalyst. Taken usually used Cu as example, catalytically-decomposed carbon atoms are embedded in liquid metals compared to the low carbon solubility in solid metals(e.g. Cu). During cooling, solidified Cu surface derived from the quasi-atomic smooth liquid surface can lead to low-defect graphene. The carbon precipitation is blocked by frozen metal lattices and the underlying liquid bulk acts as a container to buffer the excess carbon supply. Therefore, the growth of graphene follows the self-limiting process and it is robust to variations in growth conditions. What’s more, other liquid metals(Ga and In) also show similar catalytic behaviors. Without complex pretreatments and precise control of the growth conditions, the use of liquid metals provide an access to obtain uniform graphene with simplicity, scalability and a large growth window.更多还原