Force-controlled lifting of molecular wires
Force-controlled lifting of molecular wires
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DOI：
10.1103/physrevb.84.035435
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发表时间：
2011-07-25
影响因子：
3.7
通讯作者：
Tautz, F. S.
中科院分区：
文献类型：
--
作者：
Fournier, N.;Wagner, C.;Tautz, F. S.
用调频原子力和隧道显微镜将单个分子线从表面上抬起，可以同时监测线结构和接触的演变，并进行传输电导实验。特别是，临界点，其中个别债券的表面被打破和不稳定性，导线是倾向于改变其接触配置可以确定在力梯度和耗散响应的交界处。这种额外的机械信息可以用于明确地确定真正的分子线的电导，即通过点状“鳄鱼夹”与每个电极接触但在其他方面是自由的分子的电导。
Lifting a single molecular wire off the surface with a combined frequency-modulated atomic force and tunneling microscope it is possible to monitor the evolution of both the wire configuration and the contacts simultaneously with the transport conductance experiment. In particular, critical points where individual bonds to the surface are broken and instabilities where the wire is prone to change its contact configuration can be identified in the force gradient and dissipation responses of the junction. This additional mechanical information can be used to unambiguously determine the conductance of a true molecular wire, that is, of a molecule that is contacted via a pointlike "crocodile clip" to each of the electrodes but is otherwise free.