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Updated: Jan 13, 2026

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Development and Characterization of Near-Infrared Detectable Twin Dye Patterns on Polyester Packaging for Smart

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Researchers developed smart polyester materials with hidden near-infrared (NIR) dyes for covert tagging. These NIR-functionalized materials enable low-cost object identification and tracking in smart packaging applications.

Keywords:
BPW83 sensorNIR absorbanceNIR light emitting diodesnear-infrared (NIR)polyester textilesspectroscopytwin dyes

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Polymer Chemistry

Background:

  • Near-infrared (NIR) functionalities in smart materials enable covert tagging and object identification.
  • Polyester materials offer a versatile platform for integrating optical properties.

Purpose of the Study:

  • To develop and characterize polyester packaging surfaces with embedded twin dyes for NIR spectral tagging.
  • To evaluate the feasibility of low-cost NIR absorbance sensing for object identification.

Main Methods:

  • Direct-to-Film (DTF) transfer method to print spectrally matched twin dyes onto polyester substrates.
  • NIR absorbance spectroscopy (400-900 nm) and a custom photodiode-based detection system for characterization.
  • Real-world detection using commercial NIR cameras and custom software for code recognition.

Main Results:

  • Twin dye patterns exhibited selective NIR absorption, invisible under visible light.
  • Correlated absorbance contrast between dye pairs confirmed suitability for spectral tagging.
  • Successful non-contact identification and spatial localization of NIR codes in a detection scenario.

Conclusions:

  • Developed a low-cost, scalable approach for smart packaging using optically detectable twin dyes.
  • Demonstrated the effectiveness of accessible NIR imaging systems for identifying spectral tags.
  • Highlighted the potential of these smart polyester materials for covert tagging and object identification.