Noise Properties of Rectifying Nanopores

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Ion currents through three types of rectifying nanoporous structures are studied and compared for the first time: conically shaped polymer nanopores, glass nanopipettes, and silicon nitride nanopores. Time signals of ion currents are analyzed by power spectrum. We focus on the low-frequency range where the power spectrum magnitude scales with frequency, f, as 1/f. Glass nanopipettes and polymer nanopores exhibit non-equilibrium 1/f noise, thus the normalized power spectrum depends on the voltage polarity and magnitude. In contrast, 1/f noise in rectifying silicon nitride nanopores is of equilibrium character. Various mechanisms underlying the voltage-dependent 1/f noise are explored and discussed, including ... continued below

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PDF-file: 26 pages; size: 1.6 Mbytes

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Powell, M R; Sa, N; Davenport, M; Healy, K; Vlassiouk, I; Letant, S E et al. February 18, 2011.

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Ion currents through three types of rectifying nanoporous structures are studied and compared for the first time: conically shaped polymer nanopores, glass nanopipettes, and silicon nitride nanopores. Time signals of ion currents are analyzed by power spectrum. We focus on the low-frequency range where the power spectrum magnitude scales with frequency, f, as 1/f. Glass nanopipettes and polymer nanopores exhibit non-equilibrium 1/f noise, thus the normalized power spectrum depends on the voltage polarity and magnitude. In contrast, 1/f noise in rectifying silicon nitride nanopores is of equilibrium character. Various mechanisms underlying the voltage-dependent 1/f noise are explored and discussed, including intrinsic pore wall dynamics, and formation of vortices and non-linear flow patterns in the pore. Experimental data are supported by modeling of ion currents based on the coupled Poisson-Nernst-Planck and Navier Stokes equations. We conclude that the voltage-dependent 1/f noise observed in polymer and glass asymmetric nanopores might result from high and asymmetric electric fields inducing secondary effects in the pore such as enhanced water dissociation.

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PDF-file: 26 pages; size: 1.6 Mbytes

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  • Journal Name: Journal of Physical Chemistry C, vol. 115, n/a, April 12, 2011, pp. 8775-8783; Journal Volume: 115

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  • Report No.: LLNL-JRNL-474233
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1021548
  • Archival Resource Key: ark:/67531/metadc833757

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  • February 18, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 6, 2016, 2:07 p.m.

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Powell, M R; Sa, N; Davenport, M; Healy, K; Vlassiouk, I; Letant, S E et al. Noise Properties of Rectifying Nanopores, article, February 18, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc833757/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.