Electrochemistry at the Edge of a Single Graphene Layer in a Nanopore

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• 作者：Shouvik Banerjee ; Jiwook Shim ; Jose Rivera ; Xiaozhong Jin ; David Estrada ; Vita Solovyeva ; Xueqiu You ; James Pak ; Eric Pop ; Narayana Aluru ; Rashid Bashir
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：January 22, 2013
• 年：2013
• 卷：7
• 期：1
• 页码：834-843
• 全文大小：589K
• 年卷期：v.7,no.1(January 22, 2013)
• ISSN：1936-086X

文摘

We study the electrochemistry of single layer graphene edges using a nanopore-based structure consisting of stacked graphene and Al₂O₃ dielectric layers. Nanopores, with diameters ranging from 5 to 20 nm, are formed by an electron beam sculpting process on the stacked layers. This leads to a unique edge structure which, along with the atomically thin nature of the embedded graphene electrode, demonstrates electrochemical current densities as high as 1.2 脳 10⁴ A/cm². The graphene edge embedded structure offers a unique capability to study the electrochemical exchange at an individual graphene edge, isolated from the basal plane electrochemical activity. We also report ionic current modulation in the nanopore by biasing the embedded graphene terminal with respect to the electrodes in the fluid. The high electrochemical specific current density for a graphene nanopore-based device can have many applications in sensitive chemical and biological sensing, and energy storage devices.

Keywords:

Nanopores; graphene; graphene electrochemistry; nanobio sensors; stacked graphene