3. Conclusion
In summary, we construct a multistage micro-structured multifunctional
ionic skin (MM i-skin) that features high sensitivity, excellent
responsiveness (46 ms), great durability, and its superior sensing
performance has been vastly improved over previous pressure ionic skin.
As a capacitive function ionic skin (C-iskin), it was initially applied
to monitor subtle vital physiological signals including breathing, voice
recognition, and pulse. As the outstanding contribution of this work, a
self-powered wearable health monitoring device using different
properties of the same material to achieve two different energy supply
modes was devised, that is piezoelectric self-powered ion skin (P-iskin)
and thermoelectric self-powered ion skin (T-iskin), aiming at
eliminating dependence on external power supply. P-iskin shows great
potential for real-time monitoring of human joint activities.
Furthermore, the T-iskin based on the low-order thermal energy from the
temperature difference between the human body and the environment, which
is used for real time monitoring of human joint activities. Therefore,
the utilization of own low-order energy proposed in this study provides
great reference significance for the construction of self-powered
wearable health monitoring devices as well as solving the energy crisis,
realizing real-time self-health monitoring and the building of smart
medical systems.