Origin of giant ionic currents in carbon nanotube channels.
Origin of giant ionic currents in carbon nanotube channels.
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DOI：
10.1021/nn202115s
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发表时间：
2011-09-27
期刊：
影响因子：
17.1
通讯作者：
Lindsay, Stuart
中科院分区：
文献类型：
--
作者：
Pang, Pei;He, Jin;Park, Jae Hyun;Krstic, Predrag S.;Lindsay, Stuart
碳纳米管内的流体流动非常显著：水和气体的传输几乎没有摩擦，而较小的通道尺寸导致了离子的选择性传输。最近，已经制造出一种装置，其中一个狭窄的单壁碳纳米管跨越分隔电解液储存库的障碍物。流经这些设备的离子电流大约比根据电解液的体电阻率预测的大两个数量级。如果试管同时带电并优先输送阴离子或阳离子，则电渗透可以驱动这些大的过剩电流。通过建立一个嵌入在流体势垒中的栅电极的纳米流体场效应晶体管，我们证明了管子携带负电荷，多余的电流由阳离子携带。用Poisson-Nernst-Planck-Stokes方程准确地预测了过电流的大小及其受栅电极的控制。
Fluid flow inside carbon nanotubes is remarkable: transport of water and gasses is nearly frictionless and the small channel size results in selective transport of ions. Very recently, devices have been fabricated in which one narrow single-walled carbon nanotube spans a barrier separating electrolyte reservoirs. Ion current through these devices is about two orders of magnitude larger than predicted from the bulk resistivity of the electrolyte. Electroosmosis can drive these large excess currents if the tube is both charged and transports anions or cations preferentially. By building a nanofluidic field-effect transistor with a gate electrode embedded in the fluid barrier, we show that the tube carries a negative charge and the excess current is carried by cations. The magnitude of the excess current, and its control by a gate electrode is correctly predicted by the Poisson-Nernst-Planck-Stokes equations.
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