  Next-generation touch panels are poised to benefit from the use of
stretchable and transparent soft ionic conductors, but these materials face
several challenges in practical application, including structural damage, loss
of functionality, and device stratification, particularly in extreme
environments. To address these challenges, in this work, a biocompatible,
transparent, self-adhesive gelatin-PAA-based organic hydrogel (PC-OH) was
developed, the gel can adhere to the skin in both air and underwater conditions
and also anti-freezing, anti-drying, fast self-healable (with a self-healing
time of less than 4s in air and underwater), long-term stable for up to 7 days
at a wide range of temperatures, highly stretchable, and conductive over a wide
temperature range. Using this organic hydrogel, an organic hydrogel-based
surface capacitive touch system has been developed that can detect finger touch
position in wet environments and over a wide temperature range, demonstrating
its ability to sense finger touch position. The wearable touch panel has been
successfully demonstrated through the ability to write text, draw figures, and
play electronic games, showcasing its potential use in various applications.
This breakthrough has significant implications for the development of
next-generation touch panels, particularly in the healthcare, sports, and
entertainment industries, where reliable and versatile human-machine interfaces
are essential.
