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Identifying the mechanism of biosensing with carbon nanotube transistors

机译：识别碳纳米管晶体管的生物传感机制

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Carbon nanotube transistors have outstanding, potential for electronic detection of biomolecules in solution. The physical mechanism underlying sensing however remains controversial, which hampers full exploitation of these promising nanosensors. Previously suggested mechanisms are electrostatic gating, changes in gate coupling, carrier mobility changes, and Schottky barrier effects. We argue that each mechanism has its characteristic effect on the liquid gate potential dependence of the device conductance. By studying both the electron and hole conduction, the sensing mechanisms can be unambiguously identified. From extensive protein-adsorption experiments on such devices, we find that electrostatic gating and Schottky barrier effects are the two relevant mechanisms, with electrostatic gating being most reproducible. If the contact region is passivated, sensing is shown to be dominated by electrostatic gating, which demonstrates that the sensitive part of a nanotube transistor is not limited to the contact region, as previously suggested. Such a layout provides a reliable platform for biosensing with nanotubes.
机译：碳纳米管晶体管具有杰出的潜力，可用于电子检测溶液中的生物分子。然而，感测背后的物理机制仍然存在争议，这阻碍了对这些有前途的纳米传感器的充分利用。先前提出的机制是静电门控，栅极耦合变化，载流子迁移率变化和肖特基势垒效应。我们认为每种机制对器件电导的液栅电势依赖性都有其独特的影响。通过研究电子和空穴的传导，可以明确地确定传感机制。通过在此类设备上进行广泛的蛋白质吸附实验，我们发现静电门控和肖特基势垒效应是两个相关的机制，其中静电门控的再现性最高。如果接触区被钝化，则表明感应被静电门控所支配，这表明纳米管晶体管的敏感部分不限于接触区，如先前所建议的。这样的布局为纳米管的生物传感提供了可靠的平台。

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