Piezoresistivity in single DNA molecules.
Piezoresistivity in single DNA molecules.
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DOI：
10.1038/ncomms9032
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发表时间：
2015-09-04
影响因子：
16.6
通讯作者：
Tao N
中科院分区：
文献类型：
--
作者：
Bruot C;Palma JL;Xiang L;Mujica V;Ratner MA;Tao N
压阻是材料的基本性质，已经发现许多器件应用。在这里，我们报告在双螺旋DNA分子的压阻。通过研究不同序列和长度的单DNA分子的电导和压阻的依赖关系，并进行分子轨道计算，我们证明了DNA的压阻是由力引起的相邻碱基间π-π电子耦合和空穴跳跃激活能的变化引起的.我们描述的结果，热激活的跳跃模型与梯形的力学模型的DNA提出的de Gennes。压阻在微机电系统中有许多应用，但在分子水平上的压阻材料尚未得到证实。在这里，Bruot等人在双螺旋DNA分子中显示了这种效应，这是由于相邻碱基之间在机械力作用下的电子耦合。
Piezoresistivity is a fundamental property of materials that has found many device applications. Here we report piezoresistivity in double helical DNA molecules. By studying the dependence of molecular conductance and piezoresistivity of single DNA molecules with different sequences and lengths, and performing molecular orbital calculations, we show that the piezoresistivity of DNA is caused by force-induced changes in the π–π electronic coupling between neighbouring bases, and in the activation energy of hole hopping. We describe the results in terms of thermal activated hopping model together with the ladder-based mechanical model for DNA proposed by de Gennes. Piezoresistivity finds many applications in micro-electromechanical systems, but a piezoresistive material at a molecular level has not yet been demonstrated. Here, Bruot et al. show this effect in double helix DNA molecules due to the electronic coupling between neighbouring bases upon mechanical force.