Integrated Smart Janus Textile Bands for Self-pumping Sweat Sampling and Analysis.

Wearable sweat sensors have spearheaded the thrust toward personalized health monitoring with continuous, real-time and molecular-level insight in a noninvasive manner. However, effective sweat sampling still remains a huge challenge. Here we introduce an intelligent Janus textile band that bridges the gap between self-pumping sweat collection, comfortable epidemic microclimate and sensitive electrochemical biosensing via an integrated wearable platform. The dominant sweat sampling configuration is a textile with Janus-wettability, which is fabricated by electrospinning hydrophobic polyurethane (PU) nanofiber array onto superhydrophilic gauze. Based on a contact-pumping model, the Janus textile can unidirectionally and thoroughly transport sweat from skin (hydrophobic side) to embedded electrode surface (hydrophilic side) with epidemic comfort. On-body experiment reveals that the sensitive detection of multiple biomarkers including glucose, lactate, K+ and Na+ is achieved in the pumped sweat. Such smart Janus textile bands can effectively drain epidermal sweat to targeted assay sites via interface modifications, representing a reinforced and controlled biofluids analysis pathway with physiological comfort.