Multifunctional Flexible Graphene Oxide/Bacterial Cellulose Composite Paper Platforms for Realtime Monitoring Sweat and Strain in Wearable Device

Abstract

Multifunctional flexible wearable sweat sensors could provide comprehensively in-suit information about heanth for the real-time diagnostics, but the mismatch among various functional parts compromised their stable performance under operation. We report a stable, multifunctional and scalebale paper-based flexible sensing platform for the improved performance for in-suit sweat stimulating and analyzing of sweat as well as the monitoring of body motion. The welded honeycomb structure of composite paper  formed in the direct laser writing can provide the reversible and pricise response in resistance during bending. The internal confined space containning the bacterial cellulose can induce a electrostatic enrichment of hydrogen ions in sweat, thus enhancing the sensitivity (68 mV pH-1) to break Nerst limitation. In addition, the controlled joule heating effect and the nano-fluid channels of the papers can help generate and rapidly transfer the sweat, further facilitating a casual and rapid responsive detection.

Keywords: paper electronics, laser patterning, graphene oxide, strain sensor, sweat pH sensor