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Optimization of CE2 ink mixture and fabrication parameters. (A) Illustration outlining primary fabrication steps of the piezoresistive sensor array. (B) Optical microscope images and surface characterization of the bare and printed IDEs. (C) Resistivity of printed CE2 when mixed at different ratios of carbon-epoxy ink and PDMS (n = 10). (D) Overall height of the sensor when printing 1–5 layers (n = 10). (E) Resistivity of printed CE2 when printing 1–5 layers (n = 10).
