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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.

|March 17, 2025

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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.

Keywords:

anticounterfeit gold metal nanoparticles nanorods plasmonics sensing

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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.