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Emerging Inkjet-Compatible Anti-Counterfeiting Inks Based on Microfluidic-Synthesized NIR PbS/CdS Quantum Dots.

Andi Magattang Gafur Muchlis1, Chong-Ci Hu1, Hoang-Duy Nguyen2

  • 1Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 10608, Taiwan.

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Summary

Researchers developed a microfluidic method for synthesizing lead sulfide/cadmium sulfide (PbS/CdS) quantum dots (QDs) for near-infrared (NIR) applications. This technique enables scalable production of stable NIR emissive inks for covert anti-counterfeiting solutions.

Keywords:
PbS/CdS quantum dotsanti-counterfeitinginkjet printingmicrofluidic synthesisnear-infrared

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Lead sulfide (PbS) quantum dots (QDs) exhibit promising near-infrared (NIR) emission properties.
  • Core-shell PbS/CdS QDs offer enhanced stability and tunable optical characteristics via cation exchange.
  • Industrial demand necessitates scalable synthesis methods for PbS/CdS QDs.

Purpose of the Study:

  • To develop a microfluidic platform for the large-scale, controlled synthesis of PbS and PbS/CdS QDs.
  • To produce stable, NIR-emissive inks from synthesized QDs for anti-counterfeiting applications.
  • To demonstrate a covert optical security mechanism using NIR-emissive inkjet-printed materials.

Main Methods:

  • Utilized a microfluidic device for precise control over synthesis parameters (flow rates, mixing, temperature, residence time).
  • Synthesized PbS QDs with tunable wavelengths (1200-1600 nm) and PbS/CdS core-shell QDs via cation exchange (Pb²⁺ → Cd²⁺).
  • Formulated an oily hydrophobic ink by dissolving QDs in octadecene-octane with polyethylene and assessed inkjet printability.

Main Results:

  • Achieved highly monodisperse PbS and PbS/CdS QDs with consistent optical properties.
  • PbS/CdS QD synthesis completed in 5 minutes, showing a 150 nm blue-shift and stable fwhm of 223 nm.
  • Successfully printed invisible NIR emissive patterns using inkjet printers, detectable only under NIR imaging.

Conclusions:

  • Microfluidic synthesis offers superior control for producing uniform QDs with desired optical properties.
  • The developed NIR-emissive ink and printing method provide a novel, low-cost, high-security anti-counterfeiting solution.
  • This covert optical security approach leverages NIR emission for advanced identification and authentication.