fig6

Figure 6. Electrophysiological sensors. (A) Image of a 3D-comb structured electrode; (B) EEG signals recorded during eye-blinking. Reproduced with permission from ref^[152]. Copyright 2020, The Author(s); (C) Images of the structure and elements of the EEG earphone (left) and time-frequency analysis of EEG spectrogram from awake to drowsiness states (right). Reproduced with permission from ref^[158]. Copyright 2018, American Chemical Society; (D) Stencil printing of the electronic ink (top) and the resulting electrode drawn directly on the skin (bottom); (E) Images of EP sensor (left) and recorded ECG signals (right) without and with applied strain. Reproduced with permission from ref^[160]. Copyright 2020, The Author(s); (F) Analog voltage signals obtained from the Ag microflakes and EGaIn droplets-based ECG patch. Reproduced with permission from ref^[161]. Copyright 2022, The Authors. Advanced Materials Technologies published by Wile-VCH GmbH; (G) Image of a nanocomposite electrode laminated on the forearm under applied strain (left). EMG signals measured with nanocomposite (middle) and Ag/AgCl gel electrode (right) before and after wearing for 8 h. Reproduced with permission from ref^[162]. Copyright 2022, The Author(s); (H) Image of the skin-mounted sensor using patterned nanomembranes (left) and the recorded EMG data from three channels (right). Reproduced with permission from ref^[44]. Copyright 2021, The American Association for the Advancement of Science. AgNWs: Silver nanowires; CNTs: carbon nanotubes; ECG: electrocardiogram; EEG: electroencephalogram; EGaIn: Eutectic gallium-indium; EMG: electromyogram; PDMS: polydimethylsiloxane.