Yunna Guo
(, ), Hantao Cui
(, ), Zhangran Ye
(, ), Xixi Qin
(, ), Peng Jia
(, ), Lei Deng
(, ), Chongchong Ma
(, ), Chao Tai
(, ), Liqiang Zhang
(, ), Bin Wen
(, )
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By employing electron beam irradiation combined with heating at 650°C in an oxygen atmosphere (0.01 mbar), controllable fabrication of 2DAC is achieved. In this process, the raw diamond sheet first transforms into graphite, and as the reaction goes on, the amount of graphite increases, eventually transitioning into 2DAC. First-principles calculations indicate that it is an energy-favorable process from diamond to graphite. Although there is an energy barrier for graphite-to-amorphous carbon transition, electron beam irradiation induces numerous defects that can overcome this barrier. This method not only fabricates 2DAC with atomic precision but also provides <i>in-situ</i> analysis of its formation process. The research findings contribute to a fundamental understanding of the formation process of 2DAC and offer new insights for the preparation of 2D ultrathin amorphous materials.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":773,"journal":{"name":"Science China Materials","volume":"67 12","pages":"4059 - 4064"},"PeriodicalIF":6.8000,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Atomic processing of two-dimensional amorphous carbon\",\"authors\":\"Yunna Guo \\n (, ), Hantao Cui \\n (, ), Zhangran Ye \\n (, ), Xixi Qin \\n (, ), Peng Jia \\n (, ), Lei Deng \\n (, ), Chongchong Ma \\n (, ), Chao Tai \\n (, ), Liqiang Zhang \\n (, ), Bin Wen \\n (, )\",\"doi\":\"10.1007/s40843-024-3100-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Two-dimensional amorphous carbon (2DAC) materials possess characteristics such as high conductivity, high flexibility, and chemical stability, making them promising for applications in electronics, sensors, catalysts, superconductors, energy storage, and energy conversion. However, it is still a challenge to directly synthesize 2DAC till now. Meanwhile, many controversies exist in their formation process and structure. Therefore, this article utilizes a top-down etching method to prepare 2DAC in environmental transmission electron microscope (ETEM). By employing electron beam irradiation combined with heating at 650°C in an oxygen atmosphere (0.01 mbar), controllable fabrication of 2DAC is achieved. In this process, the raw diamond sheet first transforms into graphite, and as the reaction goes on, the amount of graphite increases, eventually transitioning into 2DAC. First-principles calculations indicate that it is an energy-favorable process from diamond to graphite. Although there is an energy barrier for graphite-to-amorphous carbon transition, electron beam irradiation induces numerous defects that can overcome this barrier. This method not only fabricates 2DAC with atomic precision but also provides <i>in-situ</i> analysis of its formation process. 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Atomic processing of two-dimensional amorphous carbon
Two-dimensional amorphous carbon (2DAC) materials possess characteristics such as high conductivity, high flexibility, and chemical stability, making them promising for applications in electronics, sensors, catalysts, superconductors, energy storage, and energy conversion. However, it is still a challenge to directly synthesize 2DAC till now. Meanwhile, many controversies exist in their formation process and structure. Therefore, this article utilizes a top-down etching method to prepare 2DAC in environmental transmission electron microscope (ETEM). By employing electron beam irradiation combined with heating at 650°C in an oxygen atmosphere (0.01 mbar), controllable fabrication of 2DAC is achieved. In this process, the raw diamond sheet first transforms into graphite, and as the reaction goes on, the amount of graphite increases, eventually transitioning into 2DAC. First-principles calculations indicate that it is an energy-favorable process from diamond to graphite. Although there is an energy barrier for graphite-to-amorphous carbon transition, electron beam irradiation induces numerous defects that can overcome this barrier. This method not only fabricates 2DAC with atomic precision but also provides in-situ analysis of its formation process. The research findings contribute to a fundamental understanding of the formation process of 2DAC and offer new insights for the preparation of 2D ultrathin amorphous materials.
期刊介绍:
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.