The mechanics-modulated tunneling spectrum and low-pass effect of viscoelastic molecular monolayer
The mechanics-modulated tunneling spectrum and low-pass effect of viscoelastic molecular monolayer
复制标题
粘弹性单分子层的力学调制隧道谱和低通效应
DOI：
10.1063/1.5003766
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发表时间：
2017
期刊：
影响因子：
1.6
通讯作者：
Yue Zheng
中科院分区：
文献类型：
--
作者：
Y. Chen;X. Y. Zhang;J. Shao;J. Yu;B. Wang;Yue Zheng
了解分子中力诱导的电导波动对于构建具有高稳定性的分子器件至关重要。虽然分子的刚度通常被认为是稳定的电导所需要的，但我们证明了粘弹性分子中的机械拖动结合了分子电导的抗噪声性和机械可控性。通过导电原子力显微镜测量和理论建模，发现粘弹性Azurin单层在低频激励下具有与施加机械脉冲的持续时间和强度相对应的谱状电导模式。在高频激励下，通过拖曳耗散防止电导波动，使分子结具有抗机械噪声的电稳健性。
Understanding the force-induced conductance fluctuation in molecules is essential for building molecular devices with high stability. While stiffness of molecule is usually considered to be desirable for stable conductance, we demonstrate mechanical dragging in viscoelastic molecules integrates both noise resistance and mechanical controllability to molecular conductance. Via conductive atomic force microscope measurement and theoretical modeling, it’s found that viscoelastic Azurin monolayer has spectrum-like pattern of conductance corresponding to the duration and strength of applied mechanical pulse under low-frequency excitation. Conductance fluctuation is prevented under high-frequency excitation by dragging dissipation, which qualifies molecular junction with electric robustness against mechanical noise.