PROJECT TITLE :
Adhesive RFID Sensor Patch for Monitoring of Sweat Electrolytes
Wearable digital health devices are dominantly found in rigid type factors like bracelets and pucks. An adhesive radio-frequency identification (RFID) sensor bandage (patch) is reported, which will be made completely intimate with human skin, a definite advantage for chronological monitoring of biomarkers in sweat. In this demonstration, a business RFID chip is adapted with minimum parts to allow potentiometric sensing of solutes in sweat, and surface temperature, as read by an Android smartphone app with 96% accuracy at 50 mM Na+ ( in vitro tests). All circuitry is solder-reflow integrated on a standard Cu/polyimide versatile-electronic layer together with an antenna, but while conjointly allowing electroplating for easy integration of exotic metals for sensing electrodes. Optional paper microfluidics wick sweat from a sweat porous adhesive allowing flow to the sensor, or the sensor can be directly contacted to the skin. The wearability of the patch has been demonstrated for up to seven days, and includes a protecting textile which provides a feel and appearance similar to a normal Band-Aid. Applications embrace hydration monitoring, however the basic capability is extendable to different mM ionic solutes in sweat (Cl−, K+, Mg2+, NH4+, and Zn2+). The planning and fabrication of the patch are provided in full detail, as the fundamental components might be helpful in the planning of alternative wearable sensors.
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