Fig. 4

Skin-like, or ‘‘epidermal’’, electronic system. a Image of a system with integrated electrodes, semiconductor components, and wireless devices in a multifunctional format (left). These systems can conformally laminate onto surface of the skin (center). The spectrograms show recorded EEG data that correspond to an awake subject when the eyes are closed and open.⁸ Reprinted with permission from Kim et al.⁸ Copyright 2011 American Association for the Advancement of Science. b Images a multifunctional epidermal device with capabilities in both sensing and stimulation, mounted on the forearm under stretching (left). Image of the devices on the bicep and tricep, for the purpose of controlling the angles of the elbow of a robotic arm (center). Corresponding EMG signals from two devices during alternation between flexion and extension of the elbow angle of the robotic arm. Reprinted with permission from Xu et al.⁸⁰ Copyright 2016 WILEY-VCH. c Image of a stretchable prosthetic skin equipped with Si NM-based temperature, strain, and pressure sensor arrays (left). Examples of operation of the prosthetic limb: images of typing a keyboard and grasping a ball using prosthetic hand (center). Plots of corresponding responses of the SiNM pressure sensor (right). Reprinted with permission from Kim et al.⁸¹ Copyright 2014 Nature Publishing Group