Recognition tunneling.
Recognition tunneling.
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DOI:
10.1088/0957-4484/21/26/262001
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发表时间:
2010-07-02
期刊:
影响因子:
3.5
通讯作者:
Huang S
中科院分区:
文献类型:
--
作者:
Lindsay S;He J;Sankey O;Hapala P;Jelinek P;Zhang P;Chang S;Huang S
Single molecules in a tunnel junction can now be interrogated reliably using chemically-functionalized electrodes. Monitoring stochastic bonding fluctuations between a ligand bound to one electrode and its target bound to a second electrode (“tethered molecule-pair” configuration) gives insight into the nature of the intermolecular bonding at a single molecule-pair level, and defines the requirements for reproducible tunneling data. Simulations show that there is an instability in the tunnel gap at large currents, and this results in a multiplicity of contacts with a corresponding spread in the measured currents. At small currents (i.e. large gaps) the gap is stable, and functionalizing a pair of electrodes with recognition reagents (the “free analyte” configuration) can generate a distinct tunneling signal when an analyte molecule is trapped in the gap. This opens up a new interface between chemistry and electronics with immediate implications for rapid sequencing of single DNA molecules.
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