Conductive Porous MXene for Bionic, Wearable, and Precise Gesture Motion Sensors

Abstract

Reliable, wide range, and highly sensitive joint movement monitoring is essential for training activities, human behavior analysis, and human-machine interfaces. Yet, most current motion sensors work on the nano/microcracks induced by the tensile deformation on the convex surface of joints during joint movements, which cannot satisfy requirements of ultrawide detectable angle range, high angle sensitivity, conformability, and consistence under cyclic movements. In nature, scorpions sense small vibrations by allowing for compression strain conversion from external mechanical vibrations through crack-shaped slit sensilla. Here, we demonstrated that ultraconformal sensors based on controlled slit structures, inspired by the geometry of a scorpion’s slit sensilla, exhibit high sensitivity (0.45%deg-1), ultralow angle detection threshold (~15°), fast response/relaxation times (115/72 ms), wide range (15° ~120°), and durability (over 1000 cycles). Also, a user-friendly, hybrid sign language system has been developed to realize Chinese and American sign language recognition and feedback through video and speech broadcasts, making these conformal motion sensors promising candidates for joint movement monitoring in wearable electronics and robotics technology.

Progress in Microtopography Optimization of Polymers-Based Pressure/Strain Sensors

“…More recently, with the development of 1D nano/micro particles or 2D materials such as Fe 2 O 3 particles, reduced graphene oxide, carbon nanofibers, MXene, etc. [ 130 , 131 , 132 , 133 , 134 , 135 , 136 ], Li et al [ 137 ] successfully combined MXene with aerogel to increase its conductivity in order to assemble an interdigital sensor system, as shown in Figure 4 c. The 3D porous MXene aerogel was composed of MXene nanosheets and cellulose nanofibers, which provide enough conductive channels with and without an external force. Finally, the 3D MXene aerogel was encapsulated in a PU layer to integrate a pressure-sensing device with self-healing properties.…”

Advanced Bio‐Inspired Mechanical Sensing Technology: Learning from Nature but Going beyond Nature

“…The sensor was intended to be utilized in wearable electronics and robots to detect joint mobility. [124] An all-purpose stretchable strain sensor with high-density nano-crack structure developed by Jeon et al has been used for whole-body motion state detection. [28] As shown in Figure 13a, the flexible glove sensor was used for hand motion detection.…”

A super water-resistant MXene sponge flexible sensor for bifunctional sensing of physical and chemical stimuli

“…[7][8][9] In recent years, conductive and hydrophilic MXene are promising candidates for the fabrication of highperformance sensors. [10][11][12][13][14][15] Due to the current human requirements for various aspects such as integration of sensor functions, multi-functional sensor devices have become one of the research hotspots. Therefore, MXene as an excellent conductive material is likely to be used in multifunctional sensors, such as humidity or pressure sensors.…”