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    Printable transistors for wearable sweat sensing

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    Author
    Rudolph, Melanie
    Harris, Jonathan
    Ratcliff, Erin L.
    Affiliation
    Univ Arizona, Dept Mat Sci & Engn
    Issue Date
    2019-05-02
    Keywords
    organic bioelectronics
    organic electrochemical transistor
    wearable printable sensors
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Melanie Rudolph, Jonathan K. Harris, and Erin L. Ratcliff "Printable transistors for wearable sweat sensing", Proc. SPIE 11020, Smart Biomedical and Physiological Sensor Technology XVI, 110200N (2 May 2019); https://doi.org/10.1117/12.2518890
    Journal
    SMART BIOMEDICAL AND PHYSIOLOGICAL SENSOR TECHNOLOGY XV
    Rights
    © 2019 SPIE
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Human performance monitoring (HPM) devices for sweat sensing in both civilian and military uses necessitate chemical sensors with low limits of detection, rapid read out times, and ultra-low volumes. Electronic and electrochemical sensing mechanisms for biomarker identification and quantification are attractive for overall ease of use, including robust, portable, fast readout, and simple operation. Transistors have the high signal gain required to sense low concentrations (μM to pM) at low volumes (μL to nL) in real-time (<1 minute), metrics not achievable by benchtop analytical techniques. Two main challenges currently prohibit the realization of transistor-based biosensors: i) the need for printed devices for low-cost, disposable sensors; and ii) the need to overcome diminished sensitivity in high ionic strength solutions. In this proof-of-concept work, we demonstrate organic electrochemical transistors (OECT) as a promising low cost, printable device platform for electrochemical detection of biomarkers in high ionic strength environments. This work focuses on how the materials choice and functionality impacts the electrochemical and sensor and transducer performance and determining the feasibility of reducing the size of the sensor to nanoliter volume detection. Initial studies target dopamine. Detection limits for simple electrochemical approaches using platinum or glassy carbon electrodes remain relatively high (~ 1-10 ng/mL or 50 nM). Using an OECT, we demonstrate an initial detection level of dopamine at ~ 10 pg/mL achieved without any selective binding modifications to the gate electrode at gate voltages below 1 V.
    ISSN
    0277-786X
    DOI
    10.1117/12.2518890
    Version
    Final published version
    Sponsors
    Air Force Research Laboratory [F A8650-13-2-731 1]; Defense and Security Research Institute through the Technology and Research Initiative FUND (TRIF) of Arizona
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2518890
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