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<p>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&#xa0;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&#xa0;MHz/(mg/mL) than the PMN-PT-based device. The integrated system employs an InGaN-based oscillator circuit resonating at 39.06&#xa0;MHz, enabling standalone operation without external signal generators. A threshold-driven LED interface (red/green for ≥ / &lt; 0.25&#xa0;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.</p>

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Portable surface acoustic wave sensor systems for microplastic detection in beverages

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月22日

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  • Jeong Hyeon Kim,
  • Min Jae Hwang,
  • Ha Yoon Jo,
  • So Yeon Choi,
  • Seong Hyeon Park,
  • Haneol Lee

摘要

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.