A High-Performance Film for Detecting Malachite Green

The residual malachite green (MG) in aquatic products poses a severe threat to human health, thus an urgent need exists for the establishment of a rapid and accurate analytical method. In this work, a high-performance film based on a nano-network structure was developed for the highly sensitive detection of MG. This film employed the nanonetwork structure as its sensing substrate, and the network structure with a high specific surface area enabled efficient enrichment of MG molecules. The silver nanoparticles uniformly modified on the surface could produce a remarkable localized surface plasmon resonance effect, thereby significantly enhancing the signals of MG molecules adsorbed on its surface. The results showed that the film exhibited a low limit of detection (LOD) of 8.8 pM for MG, with a linear range from 10 to 5000 pM. In the detection of aquatic products, this film successfully achieved the rapid and accurate determination of MG in aquatic products, showing an excellent potential for practical applications. The nanonetwork-structured film developed in this work provides a reliable and sensitive technical solution for the trace detection of MG in aquatic products.