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Microfluidic Sensor for Microplastic Detection in Saline Freshwater: Enhancements by Wheatstone Bridge and MXene-Coated Electrodes
Summary
Researchers developed a microfluidic sensor combining a Wheatstone bridge circuit and MXene-coated microwire electrodes to detect microplastics in saline freshwater, achieving a three-fold improvement in sensor response compared to unenhanced designs. The Wheatstone bridge improved signal stability by detecting minute resistance changes while MXene coatings enhanced particle capture efficiency, addressing the critical problem of reduced sensor performance in high ionic-strength environments.
This study presents a novel microfluidic sensor configuration that integrates a Wheatstone bridge and MXene-coated microwires to enhance the electrophoretic accumulation and detection of microplastics in freshwater with varying salinity. Compared to an equivalent setup lacking these enhancements, the proposed design achieves a three-fold improvement in sensor response. This advancement addresses a critical limitation of previous microplastic sensors, which typically exhibit reduced performance in high ionic strength environments. The Wheatstone bridge improves signal stability and precision by enabling the detection of minute resistance changes associated with microplastic accumulation. Simultaneously, the MXene coating increases particle capture efficiency by providing a high-surface-area electrode interface with strong affinity for microplastics. Together, these innovations enable sensitive, stable, and scalable detection of microplastics across a freshwater salinity range of 0–1000 ppm NaCl.