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arXiv 1206.4199cond-mat.mes-hallphysics.bio-ph
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用于DNA测序的双层石墨烯横向接触

Bilayer Graphene Lateral Contacts for DNA Sequencing

Yuhui He, Makusu Tsutsui, Ralph H. Scheicher, Masateru Taniguchi, Tomoji Kawai

摘要:

DNA通过具有嵌入电极的纳米孔的易位是新的快速廉价测序方法的中心,该方法允许通过其不同的电子结构区分四种核碱基。然而,DNA中核苷酸之间的亚纳米分离需要超尖锐的探针。在这里,我们提出了一种由双层石墨烯中形成的纳米孔组成的器件架构,其中两层充当单独的电触点。石墨烯0.34 nm的层间距离非常适合与单个核碱基进行电耦合,避免了制造亚纳米精度探针的困难。顶部和底部石墨烯电极从相同的横向侧接触靶分子,消除较小的嘧啶碱基和较大的嘌呤碱基之间的数量级隧穿电流变化。我们证明,将分子操作技术,使拟议的设备测序单链DNA,它甚至提供了双链DNA测序的前景。

英文摘要:

Translocation of DNA through a nanopore with embedded electrodes is at the centre of new rapid inexpensive sequencing methods which allow distinguishing the four nucleobases by their different electronic structure. However, the subnanometer separation between nucleotides in DNA requires ultra-sharp probes. Here, we propose a device architecture consisting of a nanopore formed in bilayer graphene, with the two layers acting as separate electrical contacts. The 0.34 nm interlayer distance of graphene is ideally suited for electrical coupling to a single nucleobase, avoiding the difficulty of fabricating probes with subnanometer precision. The top and bottom graphene electrodes contact the target molecule from the same lateral side, removing the orders-of-magnitude tunneling current variations between smaller pyrimidine bases and larger purine bases. We demonstrate that incorporating techniques for molecular manipulation enables the proposed device to sequence single-stranded DNA and that it offers even the prospect of sequencing double-stranded DNA.

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