Stick–Slip Motion of ssDNA over Graphene

We have performed molecular dynamics simulations of nanomanipulation experiments on short single-stranded DNA chains elastically driven on a graphene surface. After a brief transient, reproducible stick–slip cycles are observed on chains made by 10 units of thymine, cytosine, adenine, and guanine. T...

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Published in:The journal of physical chemistry. B 2018-01, Vol.122 (2), p.840-846
Main Authors: Vilhena, J. G, Gnecco, Enrico, Pawlak, Rémy, Moreno-Herrero, Fernando, Meyer, Ernst, Pérez, Rubén
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description We have performed molecular dynamics simulations of nanomanipulation experiments on short single-stranded DNA chains elastically driven on a graphene surface. After a brief transient, reproducible stick–slip cycles are observed on chains made by 10 units of thymine, cytosine, adenine, and guanine. The cycles have the periodicity of the graphene substrate, and take place via an intermediate stage, appearing as a dip in the sawtooth variations of lateral force recorded while the chains are manipulated. Guanine presents remarkable differences from the other bases, since a lower number of nucleotides are prone to stick to the substrate in this case. Nevertheless, the magnitudes of static friction and lateral stiffness are similar for all chains (30 pN and 0.7 N/m per adsorbed nucleotide respectively).
doi_str_mv 10.1021/acs.jpcb.7b06952
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title Stick–Slip Motion of ssDNA over Graphene
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