Contactless experiments on individual DNA molecules show no evidence for molecular wire behavior
Contactless experiments on individual DNA molecules show no evidence for molecular wire behavior
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DOI：
10.1073/pnas.122610899
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发表时间：
2002-06-25
影响因子：
11.1
通讯作者：
Baró, AM
中科院分区：
文献类型：
--
作者：
Gómez-Navarro, C;Moreno-Herrero, F;Baró, AM
分子被视为分子线 (MW) 的基本要求是能够以相当低的电阻传输电荷。我们进行了两项实验，首先测量从电极到分子的电荷转移，其次测量MW的介电响应。后一个实验不需要与分子的任一端接触。根据我们的实验，我们得出结论，吸附的单个 DNA 分子具有与云母、玻璃和氧化硅基材相似的电阻率。因此，吸附的 DNA 不是导体，不应将其视为 MW 应用的可行候选者。对其他纳米线（包括单壁碳纳米管）的并行研究显示出预期的导电性。
A fundamental requirement for a molecule to be considered a molecular wire (MW) is the ability to transport electrical charge with a reasonably low resistance. We have carried out two experiments that measure first, the charge transfer from an electrode to the molecule, and second, the dielectric response of the MW. The latter experiment requires no contacts to either end of the molecule. From our experiments we conclude that adsorbed individual DNA molecules have a resistivity similar to mica, glass, and silicon oxide substrates. Therefore adsorbed DNA is not a conductor, and it should not be considered as a viable candidate for MW applications. Parallel studies on other nanowires, including single-walled carbon nanotubes, showed conductivity as expected.