Stability of Graphene Edges under Electron Beam: Equilibrium Energetics versus Dynamic Effects
详细信息 查看全文
- 作者：Jani Kotakoski ; David Santos-Cottin ; Arkady V. Krasheninnikov
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：January 24, 2012
- 年：2012
- 卷：6
- 期：1
- 页码：671-676
- 全文大小：2279K
- 年卷期：v.6,no.1(January 24, 2012)
- ISSN：1936-086X
文摘
Electron beam of a transmission electron microscope can be used to alter the morphology of graphene nanoribbons and create atomically sharp edges required for applications of graphene in nanoelectronics. Using density-functional-theory-based simulations, we study the radiation hardness of graphene edges and show that the response of the ribbons to irradiation is not determined by the equilibrium energetics as assumed in previous experiments, but by kinetic effects associated with the dynamics of the edge atoms after impacts of energetic electrons. We report an unexpectedly high stability of armchair edges, comparable to that of pristine graphene, and demonstrate that the electron energy should be below 50 keV to minimize the knock-on damage.