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New achievement of nano letters:in situ discovery of abnormal etching and regrowth behavior of graphene in confined space

Author:zhuhanbin source:China Science Daily

Xuxiaozhi, a researcher at the school of physics and Telecommunications Engineering of South China Normal University, cooperated with Zhu Jun Wang, a professor at Shanghai University of science and technology, liukaihui, a professor at Peking University, and Ding Feng, a professor at Ulsan Institute of science and technology in South Korea, and made important progress in the study of low dimensional materials’ confinement catalysis. Abnormal etching and regrowth behaviors of graphene in the confinement space were found in situ. Relevant research was recently published in nano letters.

Two dimensional confined space has atomic scale gaps, strong material interactions and unique nano microenvironment. This confined space often allows reactions that cannot occur under conventional conditions. Therefore, it has great potential in the fields of material science and catalysis. In order to further explore its application in the field of catalysis, it is extremely necessary to study and understand the real catalytic behavior in the two-dimensional confined system. However, up to now, the understanding of the restricted catalytic process is still based on the late analysis of the result feedback, lacking in-situ visualization research technology and system.

Using the two-dimensional confinement system composed of double-layer graphene and copper substrate as the research model, the researchers visually studied its abnormal etching and growth behavior in situ:first, the lower graphene limited by copper and upper graphene showed interesting abnormal Etching Behavior (more than ten times faster than the upper graphene); Second, at a lower temperature (~530 ℃), the carbon etched in the lower layer can be transported in the limited interface and transferred to the upper graphene lattice with a very high efficiency (about 12%), realizing graphene growth without carbon source supply.

This research work reveals the dynamic process of abnormal catalysis in two-dimensional confined space, provides direct evidence for the research of catalysis in confined system, and paves the way for the design of high-efficiency catalysts in the future.

Professor Zhu Jun Wang, liangzhihua, a postgraduate student of South China Normal University, and kongxiao of the Korean Academy of basic sciences are the co first authors of the paper. Researcher xuxiaozhi, Professor liukaihui and Professor Ding Feng are the co corresponding authors. South China Normal University is the first unit. It is reported that xuxiaozhi is a top-notch young talent introduced by the school of physics and Telecommunications Engineering of South China Normal University in 2019, mainly engaged in the research of low dimensional materials and surface physics.

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