Electrochemistry at the edge of a single graphene layer in a nanopore.
Electrochemistry at the edge of a single graphene layer in a nanopore.
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DOI：
10.1021/nn305400n
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发表时间：
2013-01-22
期刊：
影响因子：
17.1
通讯作者：
Bashir, Rashid
中科院分区：
文献类型：
--
作者：
Banerjee, Shouvik;Shim, Jiwook;Rivera, Jose;Jin, Xiaozhong;Estrada, David;Solovyeva, Vita;You, Xueqiu;Pak, James;Pop, Eric;Aluru, Narayana;Bashir, Rashid
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 unique edge structure which, along with the atomically thin nature of the embedded graphene electrode, demonstrates electrochemical current densities as high as 1.2 × 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.
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