Fig. 20: Paper-based resistive electrochemical sensors.
From: Paper-based flexible electronic devices: processing, integration, and applications

a Paper-based biosensor fabrication. b Schematic representation of TNF-α/IL-6 detection protocol for paper-based electrodes. c EIS characterization of IL-6 detection in human serum from 2 pg/mL to 200 ng/mL. d Charge transfer resistance with uncertainty plot for IL-6 concentration from 2 pg/mL to 200 ng/mL189.