IIT Guwahati develops nanomaterial technology to combat counterfeiting

Researchers at the Indian Institute of Technology Guwahati have developed an advanced nanomaterial-based technology aimed at strengthening protection against counterfeit currency, forged documents and fake products.

The breakthrough, published in Advanced Optical Materials, uses specially engineered perovskite nanocrystals that produce highly secure light-emitting patterns resistant to heat, chemicals, and environmental damage.

Scientists say the innovation could significantly improve anti-counterfeiting systems at a time when modern forgery techniques are becoming increasingly sophisticated and capable of replicating conventional security features with high precision.

The IIT Guwahati team designed the nanocrystals using a unique double-layer protective coating that preserves their optical performance while improving stability. The material emits highly pure and intense colours with narrow emission ranges, creating precise optical signatures that are difficult to duplicate.

Researchers explained that these properties allow the technology to function as a “4D anti-counterfeiting” system, adding an extra layer of authentication complexity beyond visible security markings.

Using direct laser writing technology, the team successfully created microscopic security patterns without requiring lithographic masks. The process achieved resolutions between 10 and 40 micrometres, enabling highly detailed patterns capable of storing encoded information for secure identification and verification.

According to the researchers, the intricate designs and specialised material behaviour make replication extremely challenging for counterfeiters, as they would need to reproduce not only the visible patterns but also the unique optical and environmental responses of the nanocrystals.

Beyond security applications, the technology may also find use in next-generation consumer electronics. Scientists noted that the same nanocrystal-based approach could support the development of micro-LED displays for smartphones, wearable devices and augmented reality systems.

Experts believe the innovation has the potential to transform authentication systems across sectors such as banking, pharmaceuticals, luxury goods and official documentation. If adopted widely, it could contribute to establishing more advanced global standards for anti-counterfeiting technologies.

However, researchers also acknowledged that large-scale adoption may depend on manufacturing costs, industry integration and regulatory support. Industry observers suggest that collaboration between research institutions, policymakers and private companies will be essential for translating the laboratory breakthrough into commercial and public security applications.