Abstract: Ultrathin, stretchable, and breathable epidermal electronics are of great
significance for wearable and implantable health-monitoring devices owing
to their unique skin-conformable and skin-friendly capabilities. However, the
poor gas permeability of planar substrates with thicknesses of microns to millimeters,
in conjunction with the existing tedious and expensive fabrication
methods, has severely limited the realization of high-performance epidermal
electronic devices. Here, a novel bubble blowing method is proposed to fabricate
a 150-nm-thick, stretchable (62%), breathable (water vapor transmission
rate = 580.18 g m−2 d−1), and transparent (83% at 550 nm) epidermal electrode
based on a freestanding thermoplastic elastomer (TPE) nanomembrane.
The ultrathin epidermal electrode can be conformably attached to human
skin for high-quality electromyogram signal recording. Moreover, the device
is also demonstrated as a bionic electronic eardrum (vibration sensor) to
detect sound with ultrahigh sensitivity (969.3 kPa−1) and high signal-to-noise
ratios (51 dB at maximum) over the wide frequency range of 0–22 000 Hz.
The proposed epidermal electronic device provides a novel avenue for future
conformal wearable medical devices, human–computer interfaces, and
implantable acoustic equipment.

Full artical: https://www.onlinelibrary.wiley.com/doi/10.1002/aelm.202000306