Journal
ACS NANO
Volume 5, Issue 11, Pages 8842-8851Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn202989w
Keywords
graphene nanopore; DNA detection; molecular dynamics simulation
Categories
Funding
- National Institutes of Health [P41-RR005969, R01 GM073655]
- National Science Foundation [PHY0822613]
- TeraGrid Resource Allocation Committee [MCA935028]
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Nanopore-based single-molecule detection and analysis have been pursued intensively over the past decade. One of the most promising applications in this regard is DNA sequencing achieved through DNA translocation-induced blockades in ionic current. Recently, nanopores fabricated in graphene sheets were used to detect double-stranded DNA. Due to its subnanometer thickness, graphene nanopores show great potential to realize DNA sequencing at single-base resolution. Resolving at the atomic level electric field-driven DNA translocation through graphene nanopores is crucial to guide the design of graphene-based sequencing devices. Molecular dynamics simulations, in principle, can achieve such resolution and are employed here to investigate the effects of applied voltage, DNA conformation, and sequence as well as pore charge on the translocation characteristics of DNA. We demonstrate that such simulations yield current characteristics consistent with recent measurements and suggest that under suitable bias conditions A-T and G-C base pairs can be discriminated using graphene nanopores.
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