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Portable surface acoustic wave sensor systems for microplastic detection in beverages
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Researchers developed a portable surface acoustic wave sensor system capable of detecting microplastics in beverages in real time. The device uses a piezoelectric substrate with a biocompatible aluminum transducer and provides a simple LED readout indicating contamination levels. The study addresses a critical gap in consumer safety by offering a compact, field-deployable alternative to the bulky laboratory instruments typically used for microplastic analysis.
Abstract The escalating global plastic production (~ 390 million tons in 2022) and subsequent environmental release of microplastics necessitate urgent advancements in real-time detection technologies. While optical methods (Raman spectroscopy, FTIR) dominate current microplastic analysis, their reliance on bulky instrumentation limits field applications. This study presents a portable surface acoustic wave (SAW) sensor system for real-time microplastic detection in beverages. A biocompatible aluminum interdigital transducer (IDT) array (40 pairs, 30 μm gap) was fabricated on piezoelectric substrates (InGaN and PMN-PT), with SU-8 passivation selectively exposing sensing regions to minimize liquid-phase interference. Material characterization confirmed substrate crystallinity and composition, revealing InGaN’s superior sensitivity, estimated to be ~ 0.168 MHz/(mg/mL) than the PMN-PT-based device. The integrated system employs an InGaN-based oscillator circuit resonating at 39.06 MHz, enabling standalone operation without external signal generators. A threshold-driven LED interface (red/green for ≥ / < 0.25 mg) provides intuitive readouts, while universal printed circuit board (PCB) integration ensures portability. This work demonstrates a scalable platform for on-site microplastic monitoring, addressing critical gaps in consumer safety and environmental health.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.