The migration of metal atoms through carbon onions
The migration of metal atoms through carbon onions
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DOI：
10.1016/s0009-2614(98)00705-2
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发表时间：
1998-08-14
影响因子：
2.8
通讯作者：
Ajayan, PM
中科院分区：
文献类型：
--
作者：
Banhart, F;Redlich, P;Ajayan, PM
金属纳米晶体如钴或金在高温电子辐照下被球形石墨壳包裹。辐射促进碳洋葱的剧烈收缩。这种收缩迫使金属原子通过壳层向外迁移，即使没有进一步的辐射。这导致封装的晶体逐渐但完全地移位。在电子显微镜中的原位观察允许封装的晶体的收缩和原子通过壳的迁移被监测。实验表明，球形弯曲的石墨烯层对金属原子是可渗透的。(C)1998 Elsevier Science B.V.保留所有权利。
Metallic nanocrystals such as cobalt or gold are encapsulated by spherical graphitic shells under high-temperature electron irradiation. The irradiation promotes a heavy contraction of the carbon onions. The contraction forces the metal atoms to migrate outwards through the shells, even without further irradiation. This leads to a gradual but complete displacement of the encapsulated crystals. In-situ observation in an electron microscope allows shrinkage of the encapsulated crystals and migration of the atoms through the shells to be monitored. The experiment shows that spherically curved graphene layers are permeable to metal atoms. (C) 1998 Elsevier Science B.V. All rights reserved.