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
Huang S
中科院分区:
材料科学3区
文献类型:
--
作者:
Lindsay S;He J;Sankey O;Hapala P;Jelinek P;Zhang P;Chang S;Huang S

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现在可以使用化学功能化电极可靠地询问隧道结中的单个分子。监测与一个电极结合的配体和与第二个电极结合的靶之间的随机键合波动(“拴系分子对”配置),可以深入了解单个分子对水平上的分子间键合的性质,并定义了可再现隧道数据的要求。模拟结果表明,在大电流的隧道间隙中存在不稳定性,并且这导致在测量的电流中具有相应的扩散的多个接触。在小电流(即大间隙)下,差距是稳定的,并且当分析物分子被捕获在差距中时,用识别试剂官能化一对电极(“游离分析物”配置)可以产生明显的隧穿信号。这为化学和电子学之间开辟了一个新的接口,直接影响到单个DNA分子的快速测序。
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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