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Carbon nanotube field-effect transistors functionalized with self-assembly gold nanocrystals

机译：自组装金纳米晶体功能化的碳纳米管场效应晶体管

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Self-assembly gold nanocrystals (Au-NCs) are formed on the surface of single-walled carbon nanotubes (SWNTs) on a platform of field-effect transistors by electron-beam evaporation and post-rapid thermal annealing processes. Strong oscillations in the SWNT channel (similar to 2000 nm long) current occur below 150 K. The Raman scattering from the SWNTs suggests that the electronic structure of the SWNTs has been significantly altered by the strong Coulombic interaction with the attached Au-NCs. Two possible mechanisms are presented to explain the observations: (1) the charging process of Au-NCs is dominated by the Coulomb blockade effect. Thus the electrostatic potential of the charged Au-NCs modifies the Schottky barrier at the SWNT/Au electrode contacts, and subsequently affects the SWNT channel current (or the Schottky barrier modulation) and (2) the charged Au-NCs serve as scattering centers, which modify the local potential along the SWNT channel and then induce the oscillations in the current (i.e. energy band modulation).
机译：自组装金纳米晶体（Au-NC）通过电子束蒸发和快速后热退火工艺在场效应晶体管平台上的单壁碳纳米管（SWNT）的表面上形成。在低于150 K的电流下，SWNT通道中的强振荡（类似于2000 nm长）发生。来自SWNT的拉曼散射表明，SWNT的电子结构已因与附着的Au-NC的强库仑相互作用而显着改变。提出了两种可能的机制来解释这些观察结果：（1）Au-NC的充电过程受库仑阻塞效应支配。因此，带电的Au-NC的静电势会修改SWNT / Au电极触点处的肖特基势垒，并随后影响SWNT通道电流（或肖特基势垒调制），并且（2）带电的Au-NC充当散射中心，它们改变了沿SWNT通道的局部电势，然后在电流中引起振荡（即能带调制）。

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