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首页> 外文期刊>Physical review >Suppression of single-molecule conductance fluctuations using extended anchor groups on graphene and carbon-nanotube electrodes
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Suppression of single-molecule conductance fluctuations using extended anchor groups on graphene and carbon-nanotube electrodes

机译：使用石墨烯和碳纳米管电极上的扩展锚定基团抑制单分子电导波动

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摘要

Devices formed from single molecules attached to noble-metal electrodes exhibit large conductance fluctuations, which inhibit their development as reproducible functional units. We demonstrate that single molecules with planar anchor groups attached to carbon-based electrodes are more resilient to atomic-scale variation in the contacts and exhibit significantly lower conductance fluctuations. We examine the conductance of a 2,6-dibenzylamino core-substituted naphthalenediimide chromophore attached to carbon electrodes by either phenanthrene anchors or more extended anchor groups, which include oligophenylene ethynylene spacers. We demonstrate that for the more spatially extended anchor groups conductance fluctuations are significantly reduced. The current-voltage characteristic arising from long-range tunneling is found to be strongly nonlinear with pronounced conductance suppression below a threshold voltage of approximately 2.5 V.
机译：由附着在贵金属电极上的单分子形成的器件表现出较大的电导波动，这会阻碍其发展为可复制的功能单元。我们证明具有连接到碳基电极的平面锚定基团的单个分子对接触中的原子尺度变化更具弹性，并且表现出明显更低的电导波动。我们研究了通过菲锚或更多扩展的锚基（包括低聚亚苯基乙炔间隔基）连接到碳电极上的2,6-二苄基氨基核取代的萘二酰亚胺发色团的电导。我们证明，对于在空间上扩展的锚组，电导波动显着降低。发现远程隧道产生的电流-电压特性是强烈非线性的，在低于约2.5 V的阈值电压时具有明显的电导抑制作用。

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