Electronic signatures of all four DNA nucleosides in a tunneling gap.

Electronic signatures of all four DNA nucleosides in a tunneling gap.
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DOI:
10.1021/nl1001185
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发表时间:
2010-03-10
期刊:
影响因子:
10.8
通讯作者:
Lindsay S
Lindsay S
中科院分区:
材料科学1区
文献类型:
--
作者:
Chang S;Huang S;He J;Liang F;Zhang P;Li S;Chen X;Sankey O;Lindsay S

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Nucleosides diffusing through a 2 nm electron-tunneling junction generate current spikes of sub-millisecond duration with a broad distribution of peak currents. This distribution narrows 10-fold when one of the electrodes is functionalized with a reagent that traps nucleosides in a specific orientation with hydrogen bonds. Functionalizing the second electrode reduces contact resistance to the nucleosides, allowing them to be identified via their peak currents according to deoxyadenosine > deoxycytidine > deoxyguanosine > thymidine, in agreement with the order predicted by a density functional calculation.
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