SIGNAL (programming language)

Engineering

Materials science

Coating

Computer science

Physical chemistry

Electrical impedance

Nanotechnology

Mathematics

Mathematical analysis

Transmittance

Composite material

Conformal map

Chemistry

Programming language

Electrode

Optoelectronics

Electrical engineering

Electrical conductor

ACS Applied Materials & Interfaces

Long-term, real-time, and comfortable epidermal electronics are of great practical importance for healthcare monitoring and human–machine interaction. However, traditional physiological signal monitoring confined by the specific clinical sites and unreliability of the epidermal electrodes leads to great restrictions on its application. Herein, we constructed a solution-processed submicron (down to 230 nm), free-standing, breathable sandwich-structured hybrid electrode composed of a silver nanowire network with a conductive polymer film, which is conformal, water-permeable, and noninvasive to the skin while achieving good signal acquisition ability. The free-standing hybrid electrode is prepared via an in situ capillary force lift-off process and can be transferred onto complex surfaces. The whole process is a complete solution process that facilitates large-area preparation and application. The light-weight hybrid electrodes exhibit high optical transmittance, high electrical conductivity, and high gas/ion permeability. When the hybrid electrodes are attached onto the skin, the imperceptible films show high conformality with low electrical impedance, thus exhibiting significantly improved electrocardiology and electromyogram signal monitoring performance compared to that of the commercial gel electrodes.

Solution-Processed Submicron Free-Standing, Conformal, Transparent, Breathable Epidermal Electrodes