Intelligent and Multifunctional Graphene Nanomesh Electronic Skin with High Comfort

Abstract

As the aging population increases in many countries, electronic skin (e‐skin) for health monitoring has been attracting much attention. However, to realize the industrialization of e‐skin, two factors must be optimized. The first is to achieve high comfort, which can significantly improve the user experience. The second is to make the e‐skin intelligent, so it can detect and analyze physiological signals at the same time. In this article, intelligent and multifunctional e‐skin consisting of laser‐scribed graphene and polyurethane (PU) nanomesh is realized with high comfort. The e‐skin can be used as a strain sensor with large measurement range (>60%), good sensitivity (GF≈40), high linearity range (60%), and excellent stability (>1000 cycles). By analyzing the morphology of e‐skin, a parallel networks model is proposed to express the mechanism of the strain sensor. In addition, laser scribing is also applied to etch the insulating PU, which greatly decreases the impedance in detecting electrophysiology signals. Finally, the e‐skin is applied to monitor the electrocardiogram, electroencephalogram (EEG), and electrooculogram signals. A time‐ and frequency‐domain concatenated convolution neural network is built to analyze the EEG signal detected using the e‐skin on the forehead and classify the attention level of testers.

Gas‐Permeable Organic Electrochemical Transistor Embedded with a Porous Solid‐State Polymer Electrolyte as an on‐Skin Active Electrode for Electrophysiological Signal Acquisition

“…Clear PQRST waveforms were also observed and the SNR was calculated to be 29.0 dB, which is comparable with or higher than those using the active electrodes [ 12,25 ] and higher than those using the passive electrodes. [ 40,41 ] From the results, we can see that the RH level on the skin surface satisfies the requirements of the OECT device. The ECG signals were simultaneously acquired and amplified using the OECT as the active electrode.…”

Curved Photodetectors Based on Perovskite Microwire Arrays via In Situ Conformal Nanoimprinting

“…However, the as-prepared MWCs are of high quality and suitable for the fabrication of high-performance optoelectronic devices. As shown in Figure 5d-f and Figure S28, Supporting Information, the MWC-based PD fabricated in situ on a sphere with a radius of 5 mm exhibits a very good performance with an R up to 195 A W −1 , a D* value up to 1.2 × 10 13 Jones, an EQE up to 66 000%, and a response time as low as 3.2 ms (P inut = 1.2 × 10 -5 mW cm −2 ). The performance of this spherical substrate-based device is comparable to that of planar substrate-based devices, indicating the growth of a high-quality crystal structure on a non-expandable curved surface.…”

“…[ 5–10 ] In the medical field, the implantation of curved optoelectronic devices on complex surfaces of the skin or artificial organs is important for biological information monitoring. [ 11–13 ] In aerospace engineering, conformal antenna arrays and sensors attached to the irregular surface of an aircraft can effectively reduce the space required for antenna installation, weight of the aircraft, air resistance, and radar scattering area. [ 14–16 ] Nonconformal optical elements with curved structures are essential components of nonconformal optical systems, [ 17–19 ] such as, curved surface imagers.…”

Breathable Electronic Skins for Daily Physiological Signal Monitoring

“…and chemical physiological signals (glucose, ethanol, electrolytes, etc.). Besides, there are also multifunctional breathable e-skins for detecting multiple physiological signals [ 5 ]. According to different physiological signals or multiple physiological signals monitoring requirements, the functional materials, structures, and fabricating processes of breathable e-skins are various.…”