Fig. 3: E-skin-based HWDs.

a A graphene electronic tattoo (GET) embossed on the forearm. b A comparison of ECG acquired using GET and commercial ECG monitor from chest. c EMG signals using GET from forearm. d EEG values using GET from forehead and frequency response of EEG during open and closed eyes condition highlighting the presence of alpha waves during eyes closed. Reproduced with permission from Ameri et al.33 Copyright © ACS Nano, 2017.