沉积在不连续金属纳米颗粒阵列上的DNA分子的长程电子输运
Long range electronic tranport in DNA molecules deposited across a disconnected array of metallic nanoparticles
摘要：
我们详细报告了我们的实验上的传导$λ$ DNA分子在很宽的温度范围内沉积在几纳米厚的铂膜狭缝。这些绝缘狭缝制造使用聚焦离子束蚀刻和其特征在于广泛使用近场和电子显微镜。该表征揭示了作为离子蚀刻的结果，狭缝内部存在金属Ga纳米颗粒。在沉积了$λ$ DNA分子后，使用我们详细描述的协议，一些狭缝变得导电，并在低温下表现出超导波动。我们认为，所观察到的传导是由于沿DNA分子的运输，与镓纳米粒子存在于狭缝中的相互作用。在低温下，当Ga变成超导体时，因此可以观察到诱导超导性。这些结果表明，微小的金属颗粒可以很容易地将载流子转移到附着的DNA分子上，并提供了一个可能的和解，这是以前关于DNA分子可以导电的长度的明显矛盾的实验结果。
英文摘要：
We report in detail our experiments on the conduction of $λ$ DNA molecules over a wide range of temperature deposited across slits in a few nanometers thick platinum film. These insulating slits were fabricated using focused ion beam etching and characterized extensively using near field and electron microscopy. This characterization revealed the presence of metallic Ga nanoparticles inside the slits, as a result of the ion etching. After deposition of $λ$ DNA molecules, using a protocol that we describe in detail, some of the slits became conducting and exhibited superconducting fluctuations at low temperatures. We argue that the observed conduction was due to transport along DNA molecules, that interacted with the Ga nanoparticles present in the slit. At low temperatures when Ga becomes superconducting, induced superconductivity could therefore be observed. These results indicate that minute metallic particles can easily transfer charge carriers to attached DNA molecules and provide a possible reconciliation between apparently contradictory previous experimental results concerning the length over which DNA molecules can conduct electricity.
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