Packaging Material for Non-Destructive Food Quality Detection

The packaging material is constructed as a composite structure comprising a flexible base layer, adhesive layer, transparent conductive layer, and nanostructured layer. Each layer contributes specific properties: the flexible base layer provides mechanical strength and flexibility, the adhesive layer ensures bonding, the transparent conductive layer enables electrical conductivity and optical transparency, and the nanostructured layer (containing silver nanoparticles) provides spectral signal amplification through surface plasmon resonance. This composite structure simultaneously achieves food protection and spectral detection enhancement.

The spectral signal amplification capability is built into the packaging material during manufacturing, before the food is packaged. The nanostructured layer with silver nanoparticles is pre-formed on the packaging surface, creating a ready-to-use detection interface. When spectral detection is needed, the system can immediately detect food quality through the intact packaging without requiring sample preparation or package destruction, thus eliminating time loss and sample waste.

The packaging material is divided into four distinct functional layers: flexible base layer, adhesive layer, transparent conductive layer, and nanostructured layer. This segmentation allows each layer to be optimized and manufactured separately using appropriate techniques (such as sputtering for the conductive layer and nanoparticle deposition for the nanostructured layer), then assembled into the final composite structure. This modular approach manages manufacturing complexity while achieving high detection sensitivity.