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Paper as Active Layer in Inkjet-Printed Capacitive Humidity Sensors.

Cristina Gaspar1, Juuso Olkkonen2, Soile Passoja3

  • 1Printed Functional Solutions, VTT Technical Research Centre of Finland, Espoo 02044, Finland. chg12706@fct.unl.pt.

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Summary
This summary is machine-generated.

This study presents an inkjet-printed humidity sensor using paper as the sensing material. The developed capacitive sensor demonstrates a sensitivity of 2 pF/RH% and a fast response time, suitable for smart labels.

Keywords:
humidity sensorinkjet printingnanoparticlespapersilver

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Printable Electronics

Background:

  • Relative humidity (RH) monitoring is crucial for various applications, including smart packaging and environmental sensing.
  • Traditional RH sensors can be expensive and complex to manufacture.
  • There is a need for low-cost, easily fabricated RH sensors.

Purpose of the Study:

  • To develop and demonstrate an inkjet-printed capacitive relative humidity sensor.
  • To utilize paper as a sustainable and cost-effective sensing material.
  • To evaluate the sensor's performance for potential use in smart labels.

Main Methods:

  • Inkjet printing of silver interdigitated electrodes onto a paper substrate.
  • Fabrication of a capacitive sensor utilizing the paper as the sensing medium.
  • Characterization of sensor response to varying relative humidity levels and temperature.

Main Results:

  • A functional proof-of-concept for an inkjet-printed RH sensor was successfully fabricated.
  • The sensor exhibited a sensitivity of approximately 2 pF/RH%.
  • The sensor demonstrated a consistent and relatively fast response time (4-5 minutes) across a temperature range of 3-85 °C.

Conclusions:

  • Inkjet printing offers a viable method for fabricating low-cost RH sensors on paper substrates.
  • The paper-based capacitive sensor shows promising performance for smart label applications.
  • This technology enables the development of sustainable and integrated environmental monitoring solutions.