Unlocking pomegranate-structured wireless sensors with superhigh sensitivity via room-temperature water-driven rapid solidification of conductive pathways

Abstract

Human health and food safety are global challenges, seriously endangering the sustainable development of human and society. Owing to high sensitivity and excellent mechanical properties, traditional film-based wireless sensor devices can capture human physiological signals, but it is hard to make a breakthrough in simultaneous real-time monitoring of food spoilage. Concretely, due to difficult-to-control molecular behavior and the conflict between rapid solidification and order structure, the fabrication of film-based sensor device with orderly conductive pathways remains a great obstacle. Herein, a scale‐producible room-temperature water-driven strategy is employed to manufacture pomegranate-structured film-based sensor devices with fast-solidified orderly conductive pathways for simultaneous detecting human physiology and spoilage gas signals by assembling multi-branched cellulose nanofiber (MCNF), polyaniline (PANI) and multi-walled carbon nanotube (CNT) via multiple bonds. Surprisingly, the superhigh sensitive sensor devices can be successfully integrated into a wireless heart rate monitor and smart packaging monitoring system for real-time monitoring human physiological and food spoilage gas signals. Therefore, this strategy enables molecular ordering by room-temperature water-driving, which resolves the conflict between fast solidification and ordered structure, and provides a new paradigm to address health management and food packaging issues.