Flexible Au tape-based SERS sensor for atmospheric microplastic detection

The analysis of microplastics is important due to their widespread presence and potential health impacts. While most research has focused on investigating microplastics in aqueous environments, real-time atmospheric detection methods remain limited. Herein, we introduce an innovative flexible sensor for rapid detection of atmospheric microplastics using surface-enhanced Raman scattering (SERS). Our sensor, composed of Au nanoparticle (AuNP) tapes fabricated via a novel “drop-coating and peel-off” method, demonstrates exceptional SERS performance. The size, morphology, and electromagnetic field enhancement of the AuNP tape were comprehensively characterized using multiple techniques, including scanning electron microscopy, transmission electron microscopy, UV–vis spectroscopy, atomic force microscopy, and the finite-difference time-domain method. To explore the sensor's capability for MP discrimination, Raman spectra of multiple MP types were analyzed using principal component analysis, which effectively distinguished their unique spectral fingerprints. Owing to its high transparency and sensitivity, the AuNP tape enables reliable identification of multi-component microplastics in atmospheric environment. This study bridges a critical gap in microplastic research and enhances our understanding of microplastic pollution. • SERS substrate streamlines efficient detection of atmospheric microplastics. • Gold nanoparticles for enhancement, flexible substrate, and sensitive analysis. • Superior sensitivity with direct-contact microplastic detection. • Enhanced SERS technology for microplastic monitoring.