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Bundled carbon nanotube-based sensor on paper-based microfluidic device.

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A novel paper-based microfluidic device integrates bundled carbon nanotube (CNT) sensors for electrical pH measurement. This low-cost, disposable sensor enables passive fluid transport and chemical analysis, suitable for developing regions.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Microfluidics

Background:

  • Paper-based analytical devices offer low cost and disposability.
  • Carbon nanotubes (CNTs) possess unique electrical properties suitable for sensing.
  • Integrating sensing with fluidics on a single substrate is crucial for microfluidic devices.

Purpose of the Study:

  • To develop a paper-based microfluidic device integrating bundled carbon nanotube (CNT) sensors.
  • To demonstrate the device's capability for electrical pH measurement of solutions.
  • To showcase a platform for low-cost, portable chemical sensing.

Main Methods:

  • Fabrication of bundled CNT-based sensors on paper substrates via vacuum filtration.
  • Definition of hydrophilic microfluidic channels using polydimethylsiloxane (PDMS).
  • Passive transport of aqueous solutions through the paper substrate by wicking.
  • Electrical resistance measurement of the CNT sensor to determine pH.

Main Results:

  • Successful fabrication of a single-piece paper device combining fluidic channels and CNT sensors.
  • Demonstrated electrical pH measurement of solutions within a range of pH 3 to 11.
  • Passive fluid transport achieved through the hydrophilic paper channels.
  • Correlation between solution pH and the sensor's electrical resistance change.

Conclusions:

  • The developed paper-based microfluidic device offers a low-cost, flexible, and disposable platform for chemical sensing.
  • The device is suitable for analytical applications in resource-limited settings and harsh environments.
  • The CNT-based sensor's potential for functionalization suggests broad applicability for various chemical and biological assays with high sensitivity and specificity.