期刊
ACS NANO
卷 10, 期 1, 页码 1539-1545出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b07098
关键词
graphene; defect; healing; electrochemical deposition; flexible and stretchable electronics
类别
资金
- Graphene Materials and Components Development Program of MOTIE/KEIT [10044412]
- Basic Science Research Program - National Research Foundation under Ministry of Science, ICT & Future Planning, Korea [2015R1A1A1A05001115]
- Nano-Material Technology Development Program - National Research Foundation under Ministry of Science, ICT & Future Planning, Korea [2012M3A7B4049807]
- Global Ph.D. Fellowship Program - National Research Foundation under Ministry of Science, ICT & Future Planning, Korea [2013H1A2A1032731]
- High-Risk High-Return research project, KAIST
Graphene produced by chemical-vapor-deposition inevitably has defects such as grain boundaries, pinholes, wrinkles, and cracks, which are the most significant obstacles for the realization of superior properties of pristine graphene. Despite efforts to reduce these defects during synthesis, significant damages are further induced during integration and operation of flexible and stretchable applications. Therefore, defect healing is required in order to recover the ideal properties of graphene. Here, the electrical and mechanical properties of graphene are healed on the basis of selective electrochemical deposition on graphene defects. By exploiting the high current density on the defects during the electrodeposition, metal ions such as silver and gold can be selectively reduced. The process is universally applicable to conductive and insulating substrates because graphene can serve as a conducting channel of electrons. The physically filled metal on the defects improves the electrical conductivity and mechanical stretchability by means of reducing contact resistance and crack density. The healing of graphene defects is enabled by the solution-based room temperature electrodeposition process, which 'broadens the use of graphene as an engineering material.
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