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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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An apparatus based on an atomic force microscope for implementing tip-controlled local breakdown.

T St-Denis1, K Yazda1, X Capaldi1

  • 1Physics Department, McGill University, 3600 rue University, Montreal, Quebec H3A 2T8, Canada.

The Review of Scientific Instruments
|January 3, 2020
PubMed
Summary
This summary is machine-generated.

We developed a new method called tip-controlled local breakdown (TCLB) to fabricate tiny solid-state nanopores. This technique allows for better control over nanopore size and integration with other devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Solid-state nanopores are crucial for single biomolecule sensing.
  • Current fabrication methods for nanopores face challenges in integration with complex device architectures.
  • Advanced fabrication techniques are needed for precise nanopore engineering.

Purpose of the Study:

  • To introduce and detail the tip-controlled local breakdown (TCLB) method for solid-state nanopore fabrication.
  • To demonstrate improved control over nanopore size and alignment capabilities.
  • To facilitate the integration of nanopores into larger nanofluidic and electronic systems.

Main Methods:

  • Utilized an atomic force microscope (AFM) tip in contact with a silicon nitride membrane over an electrolyte reservoir.
  • Applied voltage bias to the AFM tip to induce dielectric breakdown and form a nanopore.
  • Implemented a current limiting circuit to precisely control pore formation and diameter.

Main Results:

  • Successfully fabricated solid-state nanopores using the TCLB approach.
  • Achieved smaller and more controlled nanopore diameters through current limiting.
  • Demonstrated the ability to align fabricated nanopores with pre-existing topographical features on membranes.

Conclusions:

  • The tip-controlled local breakdown (TCLB) method offers a precise and controllable approach for fabricating solid-state nanopores.
  • TCLB facilitates the integration of nanopores into advanced device architectures.
  • This technique holds significant potential for single biomolecule sensing and nanofluidic applications.