| 초록 |
Transepidermal water loss (TEWL) is a water emission from the human skin. Because TEWL is sensitive to damage on skin layer, it has been utilized for evaluation of skin barrier function. Despite the importance of TEWL monitoring, TEWL detection is still in the early stages with bulky and rigid equipment. Here, we demonstrate a stretchable hydration sensor to monitor TEWL based on a porous thermoplastic polyurethane (TPU) film coated with ion-conductive polyvinyl alcohol (PVA)/lithium chloride (LiCl) composite. The stretchable hydration sensor shows a high relative current change (∆I/I0 ~105) under a wide humidity range (from 10% to 95% RH) and endures strain up to 50%. For a proof-of-concept demonstration, stretchable hydration sensor precisely detects the change in TEWL in response to various external treatments. Finally, non-contact sensing through water loss detection is shown with the sensor array, making it suitable for use in touchless human-machine interfaces. |
