In-situ TEM study of the dynamic behavior of the graphene-metal interface evolution under Joule heating

The dynamic behavior of the interface between few layer graphene（FLG） and tungsten metal tips under Joule heating has been studied by in-situ transmission electron microscopy（TEM） method. High-resolution and real-time observations show the tungsten tip ‘swallow＇ carbon atoms of the FLG and ‘spit＇ gr...

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Bibliographic Details
Published in:Science China. Technological sciences 2016-07, Vol.59 (7), p.1080-1084
Main Authors: Wei, JiaKe, Xu, Zhi, Wang, Hao, Wang, WenLong, Bai, XueDong
Format: Article
Language:English
Subjects:
Engineering
动态行为
原位透射电镜
扩散机制
演化
焦耳加热
石墨
透射电子显微镜
金属界面
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Summary:The dynamic behavior of the interface between few layer graphene（FLG） and tungsten metal tips under Joule heating has been studied by in-situ transmission electron microscopy（TEM） method. High-resolution and real-time observations show the tungsten tip ‘swallow＇ carbon atoms of the FLG and ‘spit＇ graphite shells at its surface. The tip was carbonized to tungsten carbide（WC, W2 C and WCx） after this process. A carbon diffusion mechanism has been proposed based on the diffusion of carbon atoms through the tungsten tip and separation from the surface of the tip. After Joule heating, the initial FLG-metal mechanical contact was transformed to FLG-WCx-W contact, which results in significant improvement on electrical conductivity at the interface.
ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-016-6084-4