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Origami nanogap electrodes for reversible nanoparticle trapping.

Itir Bakis Dogru-Yuksel1, Allard P Mosk1, Sanli Faez1

  • 1Nanophotonics, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CC Utrecht, The Netherlands. i.b.dogruyuksel@uu.nl.

Nanoscale
|April 9, 2024
PubMed
Summary

We developed an easy desktop method to create origami-based nanogap indium tin oxide (ITO) particle traps. This technique simplifies fabrication and effectively traps nanoparticles using electric fields.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Microfluidics

Background:

  • Traditional methods for creating nanogap devices often involve complex and expensive lithographic techniques.
  • Developing facile and scalable fabrication methods for nanodevices is crucial for their widespread application.

Purpose of the Study:

  • To present a simplified desktop fabrication method for origami-based nanogap indium tin oxide (ITO) electrokinetic particle traps.
  • To demonstrate the effective trapping of nanoparticles using these novel nanogap structures.

Main Methods:

  • Fabrication of nanogap ITO electrodes by bending ITO thin films on PET substrates.
  • Controlled introduction of nanocracks using cut-sharp edges to form nanogaps.
  • Analysis of trapping conditions and electrode performance using optical microscopy and electrokinetic impedance spectroscopy.

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Main Results:

  • Successful creation of an array of parallel nanogaps through controlled nanocracking.
  • Demonstrated effective trapping of small nanoparticles within the nanogaps under alternating electric potential.
  • Identified conditions for reversible trapping and optimal performance of the nanogap ITO electrodes.

Conclusions:

  • The facile desktop fabrication method offers a simplified alternative to traditional lithography for creating nanogap ITO particle traps.
  • These origami-based nanogap ITO electrodes show significant potential for use in active electro-actuated traps within microfluidic systems.