1/f noise in solid-state nanopores is governed by access and surface regions

Journal article (2019)

Authors

A. Fragasso Kavli institute of nanoscience Delft, BN/Cees Dekker Lab - AS
S. Pud Kavli institute of nanoscience Delft, QN/Kavli Nanolab Delft - AS
C. Dekker Kavli institute of nanoscience Delft, BN/Cees Dekker Lab - AS
Research Group
BN/Cees Dekker Lab (AS) (TU Delft)
Copyright: © 2019 A. Fragasso, S. Pud, C. Dekker
DOI
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https://doi.org/10.1088/1361-6528/ab2d35
Nanopores Ion transport 1/f noise Access resistance Hooges model
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Published Date

2019

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

BN/Bionanoscience

Research Group

BN/Cees Dekker Lab

Abstract

The performance of solid-state nanopores as promising biosensors is severely hampered by low-frequency 1/f noise in the through-pore ionic current recordings. Here, we develop a model for the 1/f noise in such nanopores, that, unlike previous reports, accounts for contributions from both the pore-cylinder, pore-surface, and access regions. To test our model, we present measurements of the open-pore current noise through solid-state nanopores of different diameters (1-50 nm). To describe the observed trends, it appears essential to include the access resistance in the modeling of the 1/f noise. We attribute a different Hooge constant for the charge carrier fluctuations occurring in the bulk electrolyte and at the pore surface. The model reported here can be used to accurately analyze different contributions to the nanopore low-frequency noise, rendering it a powerful tool for characterizing and comparing different membrane materials in terms of their 1/f noise properties.