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Stable versus Temporally Sensitive Optical Security Tags from Metal Nanoparticles
Maha Ibrar1, Megan Knobeloch1, Nayana Christudas Beena1
1Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States.
Nano Letters
|March 17, 2025
Summary
Researchers developed optical security tags using metal nanoparticles to combat counterfeit goods. Gold nanorod tags offer the best temporal and thermal stability, indicating potential for anti-counterfeiting applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Counterfeit goods pose significant economic and safety risks.
- Developing robust security tags is crucial for product authentication.
Purpose of the Study:
- Establish design principles for stable and temporally sensitive optical security tags.
- Compare the performance of Ag-based nanorods, polymer-coated Ag-based nanorods, and Au nanorods for security tag applications.
Main Methods:
- Fabricated optical security tags using Ag-based nanorods, polymer-coated Ag-based nanorods, and Au nanorods.
- Created physically unclonable functions and unique images with nanoparticles.
- Monitored colorimetric dark-field scattering responses over time and under thermal stress.
Main Results:
- Ag-based nanorod tags exhibited the greatest color change and thermal responsiveness.
- Polymer-coated Ag-based nanorods showed intermediate stability.
- Au nanorod tags demonstrated superior temporal and thermal stability, attributed to lower surface oxidation sensitivity.
Conclusions:
- Nanoparticle composition and surface modification are key to designing optical security tags.
- These tags can serve as indicators of time, structural integrity, and tampering.
- Gold nanorods present a promising material for highly stable optical security applications.
