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Creating compact and microscale features in paper-based devices by laser cutting.

Md Almostasim Mahmud1, Eric J M Blondeel2, Moufeed Kaddoura2

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Summary

This study presents a CO2 laser fabrication method for creating ultra-small features in paper-based microfluidic devices. This technique enables high-density, low-volume bioassays on a single device, reducing reagent costs.

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Area of Science:

  • Microfluidics
  • Materials Science
  • Biotechnology

Background:

  • Paper-based microfluidic devices offer low-cost diagnostics but are limited by feature size.
  • Miniaturization is key to increasing test density and reducing sample volume requirements.

Purpose of the Study:

  • To develop a CO2 laser fabrication method for creating compact and microscale features in paper-based microfluidic devices.
  • To achieve the smallest reported features and narrowest barriers for paper-based devices.
  • To demonstrate the capability for high-density multiplexed assays.

Main Methods:

  • Utilized a CO2 laser cutting/engraving machine on foil-backed paper.
  • Optimized laser parameters (power, speed) to create hydrophobic barriers and channels.
  • Characterized barrier width (39 ± 15 μm) and channel width (128 ± 30 μm).

Main Results:

  • Achieved the narrowest hydrophobic barriers and smallest features reported for paper-based microfluidic devices.
  • Demonstrated effective prevention of cross-barrier bleeding with the created barriers.
  • Enabled eight tests on a single bioassay device using only 2 μL of sample fluid volume.

Conclusions:

  • The CO2 laser method is effective for fabricating high-density, low-volume paper-based microfluidic devices.
  • This technique is suitable for mass production of inexpensive, miniaturized diagnostic devices.
  • Miniaturized devices significantly reduce sample and reagent volumes, enhancing cost-effectiveness.