Asymmetric properties of ion current 1/f noise in conically shaped nanopores

被引：22
|
作者：
Powell, Matthew R. [1 ]
Martens, Craig [2 ]
Siwy, Zuzanna S. [1 ]
机构：
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[2] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA
来源：
CHEMICAL PHYSICS | 2010年 / 375卷 / 2-3期
基金：
美国国家科学基金会;
关键词：
Nanopore; Power spectra; 1/f noise; Biosensing; CURRENT RECTIFICATION; TRANSPORT; MEMBRANE; MODEL;
D O I：
10.1016/j.chemphys.2010.06.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We study ion currents in single rectifying conically shaped nanopores of various opening diameters and analyze the 1/f spectral behavior of the current fluctuations. The 1/f noise characteristics show an asymmetry with respect to the externally applied voltage. When in the high conductance state, the normalized 1/f noise associated with ion current signals increases with applied voltage, while in the low conductance state the 1/f noise shows equilibrium, voltage-independent fluctuations. The pore diameter and salt concentration play a direct role in defining these noise properties and influence the frequency range of the 1/f noise occurrence. We describe this behavior for a range of nanopore diameters and electrolyte concentrations. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：529 / 535
页数：7
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