Silk Fibroin‐Regulated Nanochannels for Flexible Hydrovoltaic Ion Sensing

• DOI: 10.1002/adma.202310260
• Publication Date: 2023-12-20T09:47:11Z
• Authors: Changlei Ge; Yongfeng Wang; Mingxu Wang; Zhuo Zheng; Shuqi Wang; Yaping Kong; Qiang Gao; Mengyuan Liu; Fuqin Sun; Lianhui Li; Ting Zhang
• Keywords: Fibroin; Electrospinning

Abstract The evaporation‐induced hydrovoltaic effect based on ion‐selective nanochannels can theoretically be employed for high‐performance ion sensing; yet, the indeterminate ion‐sensing properties and acquisition of high sensing performance are rarely explored. Herein, a controllable nanochannel regulation strategy flexible devices with highly sensitive abilities is presented across wide concentration range. By multiple dip‐coating silk fibroin (SF) an electrospinning nylon‐66 nanofiber (NNF) film, surface polarity enhancement, fibers size precision ≈25 nm, nanostructure firm binding achieved simultaneously. resultant freestanding device exhibits open circuit voltage up to 4.82 V in deionized water, range 10 −7 0 m, ultrahigh sensitivity as 1.37 dec −1 , which significantly higher than traditional solid‐contact electrodes (SC‐ISEs). fabricated ion‐sensitive successfully applied wearable human sweat electrolyte environmental trace‐ion monitoring, thereby confirming potential application sensing.