Piezoresistive Sensor Containing Lamellar MXene-Plant Fiber Sponge Obtained with Aqueous MXene Ink

Abstract

Sustainable biomass materials are promising for low-cost wearable piezoresistive pressure sensors, but these devices are still produced with time-consuming manufacturing processes and normally display low sensitivity and poor mechanical stability at low-pressure regimes. Here, an aqueous MXene ink obtained by simply ball-milling is developed as a conductive modifier to fabricate the multiresponsive bidirectional bending actuator and compressible MXene-plant fiber sponge (MX-PFS) for durable and wearable pressure sensors. The MX-PFS is fabricated by physically foaming MXene ink and plant fibers. It possesses a lamellar porous structure composed of one-dimensional (1D) MXene-coated plant fibers and two-dimensional (2D) MXene nanosheets, which significantly improves the compression capacity and elasticity. Consequently, the encapsulated piezoresistive sensor (PRS) exhibits large compressible strain (60%), excellent mechanical durability (10 000 cycles), low detection limit (20 Pa), high sensitivity (435.06 kPa −1 ), and rapid response time (40 ms) for practical wearable applications.

Recent Advances in Flexible Pressure Sensors Based on MXene Materials

“…Chen et al developed water-based MXene ink obtained through simple ball milling as a conductive modifier to manufacture compressible MXene plant fiber sponge (MX-PFS) for durable and wearable pressure sensors. [93] MX-PFS is made by physically foaming MXene ink and plant fibers. It has a layered porous structure composed of 1D MXene coated plant fibers and 2D MXene nanosheets, significantly improving the sensing performance of the sensor.…”

Coaxial Graphene/MXene Microfibers with Interfacial Buffer-Based Lightweight Distance Sensors Assisting Lossless Grasping of Fragile and Deformable Objects

“…Among the fresh generation of intelligent electrosensing materials, two-dimensional (2D) materials with a foam structure have attracted great attention in the field of intelligent sensing because of their low cost and light weight. − Graphene and MXene as the typical carbon-based 2D materials show great application prospects in piezoresistive sensors with flexibility and compressibility performance. − However, it is difficult for pure graphene foam to achieve high sensitivity and stability without additional additives or structural design due to poor conductivity and mechanical strength. , Although the pure MXene material itself has good electrical conductivity, it is difficult to process it into self-supporting foam because of its intrinsic weak gelation capability, which remarkably limits its wide application . Here, by combining the advantages of reduced graphene oxide (rGO) and MXene materials with the coaxial structure design, we constructed an ultra-fine and lightweight coaxial heterogeneous microfiber.…”

Strain Sensors Made of MXene, CNTs, and TPU/PSF Asymmetric Structure Films with Large Tensile Recovery and Applied in Human Health Monitoring

“…On the introduction of a variety of conductive fillers, the polymer matrix can also be structured to further obtain polymorphic conductive networks, further optimizing the performance of the sensor. The polymer matrix is constructed into porous, sandwich, tile-like accumulation, and other states to obtain structures by electrospinning, ,, foaming, , template , , and other preparation processes. Dong et al prepared a sensor containing a variety of conductive fillers and a sandwich structure by combining electrospinning and vacuum filtration, which had a wide sensing range of up to 330%, sensitivity of up to 2911 (GF), and excellent stability (2600 tensile cycles at 50% strain).…”