纳米尺度下DNA的绝缘行为
Insulating behavior of lambda-DNA on the micron scale
摘要：
我们研究了DNA共价键合到金电极的导电性的DNA。使用DNA聚合酶将巯基修饰的dTTP掺入噬菌体DNA的“粘性”末端。对这种分子的双探针测量提供了一个硬下限，即在高达20伏的偏置电位下电阻率ρ>10^6（欧姆·厘米），这与最近声称的中到高电导率相冲突。通过直接成像，我们证明了测量后分子的存在。我们强调在这些测量中消除盐残留的重要性。
英文摘要：
We have investigated the electrical conductivity of lambda-DNA using DNA covalently bonded to Au electrodes. Thiol-modified dTTP was incorporated into the `sticky' ends of bacteriophage lambda-DNA using DNA polymerase. Two-probe measurements on such molecules provide a hard lower bound for the resistivity ρ>10^6 (Ohm cm) at bias potentials up to 20 volts, in conflict with recent claims of moderate to high conductivity. By direct imaging, we show that the molecules are present after the measurements. We stress the importance of eliminating salt residues in these measurements.
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