Observing the evolution of graphene layers at high current density

Graphene has demonstrated its potential in several practical applications owing to its remarkable electronic and physical properties. In this study, we successfully fabricated a suspended graphene device with a width down to 20 nm. The morphological evolution of graphene under various electric field...

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Bibliographic Details
Published in:Nano research 2016-12, Vol.9 (12), p.3663-3670
Main Authors: Huang, Chun-Wei, Chen, Jui-Yuan, Chiu, Chung-Hua, Hsin, Cheng-Lun, Tseng, Tseung-Yuen, Wu, Wen-Wei
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Breakdown
Carrying capacity
Chemistry and Materials Science
Condensed Matter Physics
Current density
Devices
Electric fields
Electronics
Evolution
Graphene
Materials Science
Nanostructure
Nanotechnology
Nanotubes
Ostwald ripening
Ostwald熟化
Physical properties
Research Article
Surface diffusion
击穿机理
形态演变
物理性质
电场作用
石墨
透射电子显微镜
高电流密度
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Summary:Graphene has demonstrated its potential in several practical applications owing to its remarkable electronic and physical properties. In this study, we successfully fabricated a suspended graphene device with a width down to 20 nm. The morphological evolution of graphene under various electric field effects was systematically examined using an in-situ transmission electron microscope （TEM）. The hourglass-shaped graphene sample instantly broke apart at 7.5 mA, indicating an impressive breakdown current density. The current-carrying capacity was calculated to be -1.6 × 10^9 A.cm-2, which is several orders higher than that of copper. The current-carrying capacity depended on the resistivity of graphene. In addition, atomic volume changes occurred in the multilayer graphene samples due to surface diffusion and Ostwald ripening （OR）, indicating that the breakdown mechanism is well approximated by the electric field. This study not only provides a theory to explain the breakdown behavior but also presents the effects on materials contacted with a graphene layer used as the transmission path.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-016-1237-0