The effects of geometry and stability of solid-state nanopores on detecting single DNA molecules.
The effects of geometry and stability of solid-state nanopores on detecting single DNA molecules.
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DOI:
10.1088/0957-4484/26/4/044001
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发表时间:
2015-01-30
期刊:
影响因子:
3.5
通讯作者:
Li J
中科院分区:
文献类型:
--
作者:
Rollings R;Graef E;Walsh N;Nandivada S;Benamara M;Li J
In this work we use a combination of 3D-TEM tomography, energy filtered TEM, single molecule DNA translocation experiments, and numerical modeling to show a more precise relationship between nanopore shape and ionic conductance and show that changes in geometry while in solution can account for most deviations between predicted and measured conductance. We compare the structural stability of Ion Beam Sculpted (IBS), IBS-annealed, and TEM drilled nanopores. We demonstrate that annealing can significantly improve the stability of IBS made pores. Furthermore, the methods developed in this work can be used to predict pore conductance and current drop amplitudes of DNA translocation events for a wide variety of pore geometries. We discuss that chemical dissolution is one mechanism of the geometry change for SiNx nanopores and show that small modification in fabrication procedure can significantly increase the stability of IBS nanopores.
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