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Nanobubbles in solid-state nanopores.

R M M Smeets1, U F Keyser, M Y Wu

  • 1Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|October 10, 2006
PubMed
Summary
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Gaseous nanobubbles in solid-state nanopores are identified as the primary noise source. A simple nanobubble model explains conductance variations and noise in nanopore measurements.

Area of Science:

  • Nanotechnology
  • Materials Science
  • Physics

Background:

  • Solid-state nanopores are crucial for various applications, but their performance is often limited by noise.
  • Understanding the sources of noise in nanopores is essential for improving device sensitivity and reliability.

Purpose of the Study:

  • To identify the dominant noise source in solid-state nanopores.
  • To investigate the ionic conductance behavior and low-frequency noise variations in nanopores.
  • To develop a model explaining the observed conductance profiles and noise characteristics.

Main Methods:

  • Ionic conductance measurements of solid-state nanopores using an infrared laser.
  • Analysis of low-frequency noise and current power spectral density.
  • Development and application of a cylindrical nanopore model with a nanobubble.

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Main Results:

  • Nanometer-sized gaseous bubbles (nanobubbles) were identified as the dominant noise source.
  • Significant variations (up to 5 orders of magnitude) in conductance and noise were observed.
  • An unexpected double-peak ionic conductance profile was measured and explained by the nanobubble model.

Conclusions:

  • Nanobubbles are the primary cause of noise in solid-state nanopores.
  • A simple nanobubble model accurately predicts conductance profiles and noise variations.
  • This finding advances the understanding and potential control of noise in nanopore devices.