Breathable, Degradable Piezoresistive Skin Sensor Based on a Sandwich Structure for High‐Performance Pressure Detection

Abstract

Wearable intelligent sensor materials have broad application prospects for human health detection and robot kinematics. 3D structure sensors have the advantages of high sensitivity, a wide detection range, and high strength, as is widely reported in existing research. Here, a sandwich structure involving an encapsulation layer, a 3D conductive network, and an encapsulation layer is prepared. Polyaniline acts as an active conductive filler for the 3D conductive network, while silk fibroin and poly (lactic‐co‐glycolic acid) are used to form a network for carrying conductive materials. Additionally, K‐carrageenan is added to encapsulate the 3D conductive network and prepare a high‐performance green skin sensor. The sensor exhibits high sensitivity (2.54 kPa−1) and a wide linear detection range (165.3 kPa). In addition, the pressure sensor possesses excellent durability (>2000 cycles) and a fast response time of 160 ms. Moreover, the sensor is compatible and biodegradable and encapsulated by a nontoxic water‐soluble polymer. On this basis, skin sensors for health monitoring systems and intelligent interactive systems are reported, thus enabling future applications in medical detection and human–machine interaction.

Highly sensitive active-powering pressure sensor enabled by integration of double-rough surface hydrogel and flexible batteries

“…In this work, the sensor exhibited a response time of 356 ms and a recovery time of 355 ms (Supplementary Fig. 6), limited by the multiple responsiveness of the sensor 11 .…”

“…Therefore, wearable pressure sensors are important for muscle motion analysis, sign language translation, breath monitoring, flexible electronic skins, and speech recognition applications [5][6][7][8] . There are four types of wearable sensors with different sensing mechanisms: i) piezo capacitance 3,9 , ii) triboelectricity 5 , iii) piezoresistivity [10][11][12] , and iv) piezoelectricity 13 . Among these, wearable piezoresistive pressure sensors offer advantages of low cost, easy signal collection, and low power consumption, among other interesting characteristics 12 .…”

Serpentine‐Inspired Strain Sensor with Predictable Cracks for Remote Bio‐Mechanical Signal Monitoring

“…[1][2][3][4][5][6][7] The piezoresistive sensors have been widely developed because of the easy signal acquisition, simple fabrication, and cost-effectiveness. [8][9][10] Despite the excellent comprehensive performance, high sensitivity, and wide sensing range are still the continuous pursuits of piezoresistive sensors. [11][12][13][14][15] The change in the resistance of piezoresistive sensors induced by subjected stress can be converted into electrical signals.…”

Soft, Multifunctional, Robust Film Sensor Using a Ferroelectret with Significant Longitudinal and Transverse Piezoelectric Activity for Biomechanical Monitoring

“…3,12,13 To date, diverse flexible force sensors have been fabricated from a variety of sensitive materials. 14 Based on the working mechanisms of the sensing elements, flexible force sensors can be classified mainly into piezoresistive, 15 capacitive, 16 triboelectric, 17 and piezoelectric sensors. 18 The piezoresistive and capacitive force sensors are in high need of additional energy supplies to maintain operations, resulting in energy and cost issues for large-scale practical applications.…”