Wearable Circuits Sintered at Room Temperature Directly on the Skin Surface for Health Monitoring

Wearable Circuits Sintered at Room Temperature Directly on the Skin...

Abstract

Abstract Image

A soft body area sensor network presents a promising direction in wearable devices to integrate on-body sensors for physiological signal monitoring and flexible printed circuit boards (FPCBs) for signal conditioning/readout and wireless transmission. However, its realization currently relies on various sophisticated fabrication approaches such as lithography or direct printing on a carrier substrate before attaching to the body. Here, we report a universal fabrication scheme to enable printing and room-temperature sintering of the metal nanoparticle on paper/fabric for FPCBs and directly on the human skin for on-body sensors with a novel sintering aid layer. Consisting of polyvinyl alcohol (PVA) paste and nanoadditives in the water, the sintering aid layer reduces the sintering temperature. Together with the significantly decreased surface roughness, it allows for the integration of a submicron-thick conductive pattern with enhanced electromechanical performance. Various on-body sensors integrated with an FPCB to detect health conditions illustrate a system-level example.

Supporting Information


The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.0c11479.

  • Details on the materials, experimental procedures, designs of paper-based FPCB using the SL900A chip, pattern designs of sensors and characterization results of the contact angle, AFM, XRD, SEM, sheet resistance, PPG voltage measuring, and EMG/ECG signal testing (PDF)

Wearable Circuits Sintered at Room Temperature Directly on the Skin Surface for Health Monitoring


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