Development of a low-power, long-term sweat sensor patch that imitates sensory neurons NatureComms
. An agarose hydrogel solution was molded using a 3D-printed plastic master mold engraved with a truncated cone with a height of 1 mm, a bottom diameter of 1.5 mm, and a top diameter of 0.5 mm. Onto that molded hydrogel template, solutions of AgNWs and CNTs were sequentially spray-coated through a pre-patterned mask. The AgNWs and CNTs formed nanonetworks on the hydrogel surface, and the surfactants and impurities in the solution were removed through the hydrogel’s pores.
The dynamic range of the sensor with regard to ionic concentration was examined by testing various ionic concentrations at a fixed flow rate of 0.5 μL/min: 92.7 mM , 48.4 mM , 12.8 mM , and 2.4 mM .A flexible copper-clad laminate composed of a thin film of copper/PI/copper that served as the substrate of the FPCB, electroplated copper with a thickness of 10 μm, and a cover layer were used to fabricate the wireless sensor system.
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