DNA-石墨烯在纳米间隙中的相互作用
DNA-Graphene Interactions During Translocation Through Nanogaps
摘要：
我们研究了双链DNA如何通过石墨烯纳米间隙易位。纳米间隙是用一种新的毛细管力诱导的石墨烯纳米间隙形成技术制造的。由于这里讨论的间隙的不同形状，纳米间隙的DNA易位特征与用圆形纳米孔获得的DNA易位特征在性质上不同。易位时间和电导值变化$\sim 100$ %，我们认为这是由局部间隙宽度变化引起的。我们还观察到指数松弛电流的痕迹。我们认为，DNA易位后石墨烯膜的缓慢弛豫可能是负责任的。我们得出结论，DNA-石墨烯相互作用是重要的，需要考虑石墨烯纳米间隙为基础的设备。这项工作进一步开辟了直接读取单分子活性和可能测序的新途径。
英文摘要：
We study how double-stranded DNA translocates through graphene nanogaps. Nanogaps are fabricated with a novel capillary-force induced graphene nanogap formation technique. DNA translocation signatures for nanogaps are qualitatively different from those obtained with circular nanopores, owing to the distinct shape of the gaps discussed here. Translocation time and conductance values vary by $\sim 100$%, which we suggest are caused by local gap width variations. We also observe exponentially relaxing current traces. We suggest that slow relaxation of the graphene membrane following DNA translocation may be responsible. We conclude that DNA-graphene interactions are important, and need to be considered for graphene-nanogap based devices. This work further opens up new avenues for direct read of single molecule activitities, and possibly sequencing.
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