Biologically Emulated Flexible Sensors With High Sensitivity and Low Hysteresis: Toward Electronic Skin to a Sense of Touch

Abstract

Recently, flexible pressure sensors (FPSs) have attracted intensive attention owing to their ability to mimic and function as electronic skin. Some sensors are exploited with a biological structure dielectric layer for high sensitivity and detection. However, traditional sensors with bionic structures usually suffer from a limited range for high‐pressure scenes due to their high sensitivity and high hysteresis in the medium pressure range. Here, a reconfigurable flea bionic structure FPS based on 3D printing technology, which can meet the needs of different scenes via tailoring of the dedicated structural parameters, is proposed. FPS exhibits high sensitivity (1.005 kPa−1 in 0–1 kPa), wide detection range (200 kPa), high repeatability (6000 cycles in 10 kPa), low hysteresis (1.3%), fast response time (40 ms), and very low detection limit (0.5 Pa). Aiming at practical application implementation, FPS has been correspondingly placed on a finger, elbow, arm, neck, cheek, and manipulators to detect the actions of various body parts, suggestive of excellent applicability. It is also integrated to make a flexible 3 × 3 sensor array for detecting spatial pressure distribution. The results indicate that FPS exhibits a significant application potential in advanced biological wearable technologies, such as human motion monitoring.

Highly Sensitive and Wide-Range Flexible Bionic Tactile Sensors Inspired by the Octopus Sucker Structure

“…Wearable electronic skins have attracted wide attention as artificial intelligence advanced due to their various valuable application prospects, such as human–computer interaction, − soft robotics, , and healthcare monitoring. ,,− Devices for human motion detection are among the most popular devices because of the useful information they can provide to the user . Thus, subsequent research on flexible tactile sensors should be able to detect pressures from a few pascals to several hundred kilopascals, low pressure of muscle movements, relatively low pressure of finger touch, and high pressure of plantar pressure, as well as high sensitivity and mechanical reliability.…”

“…Thus, subsequent research on flexible tactile sensors should be able to detect pressures from a few pascals to several hundred kilopascals, low pressure of muscle movements, relatively low pressure of finger touch, and high pressure of plantar pressure, as well as high sensitivity and mechanical reliability. Flexible tactile sensors can be classified as capacitive, − piezoresistive, ,, piezoelectric, , and triboelectric. , Among these, capacitive tactile sensors have low power consumption, temperature insensitivity, high sensitivity, fast response times, low hysteresis, and the capability to reproduce the sensing behavior of the skin with respect to sensitivity, exhibiting broad application prospects.…”

Bioinspired Dual‐Mode Stretchable Strain Sensor Based on Magnetic Nanocomposites for Strain/Magnetic Discrimination

“…As wearable electronic devices are rapidly developing, the preparation of flexible sensors has opened up broad prospects, such as electronic skin, [1][2][3][4][5][6] health monitoring, [7][8][9][10][11][12][13][14][15][16] and intelligent robots. [17][18][19][20][21][22][23][24] Flexible sensors detect various external stimuli, including strain, pressure, and magnetic field, by monitoring the response signal.…”

Silent Speech Recognition with Strain Sensors and Deep Learning Analysis of Directional Facial Muscle Movement

“…Soft electronics have attracted a lot of attention with the ever-growing demand for wearable devices due to their capability of maintaining electrical function and performance under mechanical deformations. − Consequently, various types of soft sensors that can form conformal interfaces with human skin have been reported, and their high potential for detecting motion and sensing human biosignals such as blood flow and breathing have been demonstrated. − Diverse soft sensors, such as mechanical, − temperature, , and electrocardiogram sensors , are continuously being developed and studied for wearable applications that are otherwise difficult to implement with conventional rigid sensors. Furthermore, these applications are being expanded to human motion recognition, such as gesture, , exercise, − and eye tracking …”