Coherence Resonance in a Single-Walled Carbon Nanotube Ion Channel
Coherence Resonance in a Single-Walled Carbon Nanotube Ion Channel
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DOI：
10.1126/science.1193383
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发表时间：
2010-09-10
期刊：
影响因子：
56.9
通讯作者：
Strano, Michael S.
中科院分区：
文献类型：
--
作者：
Lee, Chang Young;Choi, Wonjoon;Strano, Michael S.
生物离子通道能够从固有的噪声和随机成分产生相干和振荡信号，用于使用随机共振进行超灵敏的辨别，这是一个尚未在人造类似物中证明的概念。我们发现，单壁碳纳米管演示了在特定范围的电场，是相干共振的签名，通过其内部的电渗流的振荡。当单个阳离子分配到纳米管中时，观察到随机孔阻塞，从而阻碍了原本稳定的质子电流。所观察到的振荡发生，因为孔隙阻塞和质子扩散限制在孔隙口之间的耦合。结果说明了简单的离子传输如何在固有的噪声环境中产生相干波形，并指出了基于该平台的新型纳米反应器，传感器和纳米流体通道。
Biological ion channels are able to generate coherent and oscillatory signals from intrinsically noisy and stochastic components for ultrasensitive discrimination with the use of stochastic resonance, a concept not yet demonstrated in human-made analogs. We show that a single-walled carbon nanotube demonstrates oscillations in electroosmotic current through its interior at specific ranges of electric field that are the signatures of coherence resonance. Stochastic pore blocking is observed when individual cations partition into the nanotube obstructing an otherwise stable proton current. The observed oscillations occur because of coupling between pore blocking and a proton-diffusion limitation at the pore mouth. The result illustrates how simple ionic transport can generate coherent waveforms within an inherently noisy environment and points to new types of nanoreactors, sensors, and nanofluidic channels based on this platform.