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Photochromic Sensors for Paper Marking.

Elżbieta Sąsiadek-Andrzejczak1, Malwina Jaszczak-Kuligowska1, Mariusz Dudek2

  • 1Department of Mechanical Engineering, Informatics and Chemistry of Polymer Materials, Faculty of Materials Technologies and Textile Design, Lodz University of Technology, Żeromskiego 116, 90-543 Lodz, Poland.

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Summary

New UV radiation sensors for paper turn pink when exposed to UVA light, with reversible color changes. These sensors offer potential for marking, security, and UV dosimetry applications on paper products.

Keywords:
UV radiation sensorUV retarderpaper markingpaper securingphotochromic sensorsecurity element

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Area of Science:

  • Materials Science
  • Analytical Chemistry

Background:

  • Paper products require methods for marking, security, and UV radiation monitoring.
  • Existing UV sensors may lack reversibility or specific applications for paper-based materials.

Purpose of the Study:

  • To develop and characterize reversible UV radiation sensors for paper applications.
  • To investigate the influence of a UV retarder on sensor performance.
  • To explore potential applications in document security and UV dosimetry.

Main Methods:

  • Fabrication of UV sensors on paper substrates.
  • Analysis of color change kinetics using reflectance spectrophotometry.
  • Chemical and morphological characterization via Raman Spectroscopy and Scanning Electron Microscopy (SEM).
  • Structural analysis using X-ray Micro-Computed Tomography (µCT).

Main Results:

  • Sensors exhibit reversible pink color change upon UVA exposure.
  • A UV retarder was successfully implemented to modulate sensor response.
  • Spectrophotometry confirmed dose-dependent color changes.
  • Raman Spectroscopy, SEM, and µCT provided insights into material composition and structure.

Conclusions:

  • Reversible UV sensors on paper are feasible for marking and security.
  • The developed sensors can quantify UVA radiation dose on paper products.
  • Potential applications include anti-counterfeiting, decorative elements, and UV dosimetry.