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    Disposable Piezoresistive MEMS Airflow Sensor for Chronic Respiratory Disease Detection
    (Ieee-Inst Electrical Electronics Engineers Inc, 2025) Aygul, Beril; Ulgaz, Sena; Yilmaz, Berkay; Akcan, Omer Gokalp; Erdil, Kuter; Gokdel, Yigit Daghan
    This paper details the design, fabrication, and characterization of a novel disposable MEMS airflow sensor, employing Bare Conductive electric paint deposited on Whatman 3MM chromatography paper through silk screen printing. The sensor achieves rapid fabrication within 30 minutes. It demonstrates a sensitivity of 1.8 kPa(-1) , a resolution of 27.6 kPa, and a limit of detection (LoD) of 48.94 kPa, with an operational pressure range from 27.6 to 137.9 kPa. An electronic readout circuit transduces electrical resistance variations into voltage signals, which are monitored via a digital multimeter and analyzed on a PC. The sensor's disposable nature mitigates nosocomial infection risks and enhances hygiene, making it ideal for monitoring respiratory conditions such as asthma and COPD. With a material cost of under 0.1, the sensor is highly suitable for scalable, cost-sensitive biomedical applications. Experimental validation confirms the reliability and precision of this proof-of-concept device in airflow measurement. 2024-0148
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    Flexible printed circuit board for biomolecule weight sensing
    (Iop Publishing Ltd, 2025) Ulgaz, Sena; Yilmaz, Berkay; Aygul, Beril; Akcan, O. Gokalp; Erdil, Kuter; Gokdel, Y. Dadhan
    This work presents the design, implementation, and characterization of a piezoresistive force sensor integrated into a flexible printed circuit board (FlexPCB). We propose a flexPCB-based MEMS sensing system with graphite as the sensing element and polyimide as the principal substrate material, intended for disposable and low-cost applications. The sensor, which was manufactured using a conventional PCB technique and silk-screen printing, can detect biomolecules attached to nanomagnetic particles with an apparent weight of 0.209 V/V mg-1 when exposed to an applied magnetic field. Within a detection range of 0-80 mu g, the sensor delivers a resolution of 10 mu g and a limit of detection of 21.16 mu g. While the detection limit reflects the weight of the nanomagnetic particle, the actual sensitivity to the biomolecule is substantially higher, allowing the system to detect lower biomolecule quantities effectively.