An Ultra-Conductive and Patternable 40 nm-Thick Polymer Film for Reliable Emotion Recognition.

Understanding psychology is an important task in modern society which helps predict human behavior and provide feedback accordingly. Monitoring of weak psychological and emotional changes requires bioelectronic devices to be stretchable and compliant for unobtrusive and high-fidelity signal acquisition. Thin conductive polymer film has been regarded as an ideal interface; however, it is very challenging to be simultaneously balance mechanical robustness and opto-electrical property. Here, we report a 40 nm-thick film based on photolithographic double-network conductive polymer mediated by graphene layer, which concurrently enables stretchability, conductivity and conformability. Photolithographic polymer and graphene endow the film photopatternability, enhance stress dissipation capability, as well as improving opto-electrical conductivity (4458 S cm -1 @ > 90% transparency) through molecular rearrangement by π-π, electrostatic interaction and hydrogen bonding. We further apply the film onto corrugated facial skin, monitor the subtle electromyogram, and perform machine learning algorithm to understand complex emotions, indicating the outstanding ability for stretchable and compliant bioelectronics. This article is protected by copyright. All rights reserved.