Intelligent fabric integrated with CdSe/ZnS quantum dots and NFC antennas for authentication under specific illumination

We need better techniques to discern the difference between real and phoney things than just QR codes and holograms, which are easy to reproduce. This research introduces an innovative dual-layer security approach for smart textiles, combining the concealed optical fingerprints of cadmium selenide/zinc sulphide (CdSe/ZnS) core-shell quantum dots (QDs) with the explicit digital identification of Near-Field Communication (NFC) technology. We manufactured high-quality QDs using the hot-injection approach. They displayed strong photoluminescence that peaked at 610 nm and a quantum yield of 65%. Then we sewed them to polyester threads and put them in a cotton cloth with an NFC tag inside. The authentication mechanism needs to do two things to be sure: First, a smartphone checks the digital signature by reading the NFC tag's unique identity. If it works, the user is next requested to shine UV light on the fabric to make sure that the QD-based photoluminescent pattern is there and appears the way it should. The results reveal that the functionalised material still has more than 85% of its initial luminous intensity after five washes. This means that it will last in real life. Because it employs a cryptographic digital key and a physical unclonable function (PUF) based on the nanomaterial’s unique optical features, the system is significantly secure. This makes it too hard and expensive for those who produce fake things to get around. This innovation establishes a good foundation for future anti-counterfeiting solutions by merging nanotechnology and digital authentication on a single textile platform.

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