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Structural Colored Based Humidity Sensor Consisting of High Resolution 3D Printed Photonic Crystal Coated with

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  • 1Graz University of Technology, Institute of Electrical Measurement and Sensor Systems, Inffeldgasse 33 / I, Graz, 8010, Austria.

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Summary

This study introduces photonic crystals for humidity sensing, overcoming limitations of electronic sensors. The novel approach uses 3D printing and hydrogels to detect humidity via visible color changes.

Keywords:
hydrogelinitiated chemical vapor depositionnanostructuresoptical sensortwo‐photon‐polymerization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optical Engineering

Background:

  • Electronic humidity sensors are standard but have drawbacks like slow response times and safety concerns in explosive environments.
  • Photonic crystals offer a promising optical alternative for humidity measurement.
  • Hydrogels are adaptable for various environmental conditions, making them suitable for sensing applications.

Purpose of the Study:

  • To develop an alternative humidity sensing technology using photonic crystals.
  • To overcome the limitations of current electronic humidity sensors.
  • To demonstrate a novel fabrication method combining 3D printing and thin-film deposition.

Main Methods:

  • Utilizing ultra-fast two-photon polymerization (2PP) printing to create large-area, high-precision 3D templates.
  • Applying chemical vapor deposition (iCVD) for coating templates with a 20 nm thin film of humidity-responsive hydrogel (p(HEMA)).
  • Employing optical detection by observing color changes in the visible spectrum.

Main Results:

  • Successful fabrication of stable, periodic, large-area 3D photonic crystal structures.
  • Demonstration of humidity detection through observable color changes in the printed hydrogel films.
  • Pushing the limits of 2PP technology for advanced material fabrication.

Conclusions:

  • Photonic crystals present a viable optical method for humidity sensing, addressing limitations of electronic sensors.
  • The combined 2PP and iCVD approach enables precise fabrication of humidity-responsive photonic structures.
  • This technology holds potential for diverse sensing applications requiring fast and safe humidity detection.