Flame‐Retardant PEDOT:PSS/LDHs/Leather Flexible Strain Sensor for Human Motion Detection

Abstract

Flexible piezoresistive sensors have demonstrated great potential in human–motion–detection applications. However, it still remains a challenge to fabricate strain sensors with high sensitivity, broad sensing range, and good linear response to strain. In this report, a simple and scalable fabrication strategy is developed to construct high performance strain sensors by using leather as the substrates to filtrate poly(3,4‐ethylenedioxythiophene): poly(4‐styrenesulfonate) (PEDOT:PSS) modified layered double hydroxides (LDHs) suspensions. The naturally aligned collagen fibers in leather enable size selection for the 2D conductive materials and as such dual‐conductive pathways are effectively formed on the surface and in the matrix of leather. Due to the unique design of conductive networks, the prepared sensor possesses high gauge factor (maximum value of 2326.84), tunable strain range (0–70%), fast tensile response time (160 ms), and good stability in 1000 stretching‐relaxing/compression‐relaxing cycles, making it suitable for various human motion detections including coughing and large‐scale motions of joint bending. In addition, the incorporated LDHs is a non‐toxic flame retardant, which is helpful to reduce electronic fire risk and can bring added value to the sensor.

Highly Stretchable, Highly Sensitive, and Antibacterial Electrospun Nanofiber Strain Sensors with Low Detection Limit and Stable CNT/MXene/CNT Sandwich Conductive Layers for Human Motion Detection

“…In addition, electrical stability of the CNT/MXene/CNT/TPU strain sensor is further characterized by the I – V curve under different stretching (Figure S6) and the Δ R / R 0 -strain curve at different stretching rates (Figure S7), which enable the sensor to accurately and timely transmit the signals captured in human motion detection to back-end processing equipment. Additionally, the performances of the CNT/MXene/CNT/TPU strain sensor and recent crack-based strain sensors are compared in terms of sensing range and sensitivity (Figure h), ,,− and the detailed parameters are shown in Table S1. It can be found that crack-based strain sensors are generally unable to combine a wide sensing range and high sensitivity.…”

Ti3C2Tx MXene Nanosheet-Functionalized Leathers for Versatile Wearable Electronics

“…24 Fabricated leather consists of collagen fiber bundles and still inherits the nanomicro structure from an animal skin. 25 The special hierarchical structure endows leather with biocompatibility and softness similar to those of human skin as well as excellent durability and breathability, making it suitable for long-time contact with human skin without irritation and discomfort. 26 Thus, leather has the potential to become an ideal flexible substrate for wearable electronics.…”

Hollow Nanospheres of Red Phosphorus for Fireproof Flexible Sensors Fabricated via 3D Printing

“…The results from the limiting oxygen index test, vertical burning test, and microscale combustion calorimetric analysis indicated that the obtained sensor possessed desirable flame retarding properties. 4 PA also endowed good flame retardancy for conductive polymer-based sensors, for example a polyaniline sensor is capable of selfextinguishing in 20 s after ignition by doping with PA. 5 Apart from PA, two-dimensional nanomaterials, such as MXene 6 and layered double hydroxides, 7 could provide self-extinguishment ability or shortened burning time when heated by the flame for a short time. Despite this, the current reports mainly examine the flame-retardant properties of the CPC-based sensors separately from the sensing ability, while the smooth operation just in the fire seems to be more valuable in the practical application for the sensors.…”