1. Article overview
In recent decades, due to the broad application prospects in portable mobile electronic devices and human motion monitoring, flexible wearable devices have been extensively studied. MXene is a new type of 2D nanomaterial, which is constantly developing and growing. Its superior properties include excellent electrical conductivity, abundant surface functional groups, unique layered structure, large surface area and hydrophilicity, making it a flexible wearable device Potential candidate materials. Many pioneering works are devoted to the development of flexible composite materials based on MXene with various functions and design structures.
Based on this, this review summarizes the latest developments in MXene-based flexible composite materials in wearable devices, focusing on the preparation strategies, working mechanisms, performance and applications of sensors, supercapacitors and electromagnetic interference shielding materials. In addition, the end of the article also discusses current challenges and future prospects.

Two, graphic guide


The advantages of MXene-based composite materials and their applications in wearable devices include a-e) wearable sensors, f-h) wearable EMI shielding materials and i-k) wearable supercapacitors.


a) Schematic diagram of the preparation process of the fibrous MXene strain sensor.
b) Schematic diagram of the spinning process of MXene/PU fiber.
c) Preparation method of MXene/CNTs interlayer.
d) Schematic diagram of MXene/graphene/PDMS strain sensor in different stretched states.
e) Schematic diagram of conductive, antifreeze and self-healing MXene-based nanocomposite organic hydrogel.


a) Schematic diagram of MXene/SWCNT/PVP film with dendritic-layered structure.
b) Making airlaid paper pressure sensor with MXene.
c) The pressure-sensitive model of the MXene-sponge sensor obtained.
d) Schematic diagram of the manufacture of MXene/BC carbon aerogel.
e) Design and assembly of MXene pressure sensor with bionic spines microstructure.
f) Schematic diagram of MXene composite material used in wearable capacitive pressure sensors.


a) The wet spinning method is based on the flow chart of the hybrid fiber of MXene.
b) Manufacturing process diagram of rGO/MXene fiber composite material.
c) Illustration of MXene/BC mixed paper and stretchable super capacitor.
d) MXene-based structure for energy storage, energy harvesting and sensors.


a) Schematic diagram of MXene/PPy ink.
b) Preparation of PET textile coated with hydrophobic MXene/PPy.
c) Manufacture of silk textiles decorated with MXene/AgNWs.
d-i) SEM images of (MA) 20 filaments under various magnifications.

3. Future research trends
1) Overcome the shortcomings of MXene, such as stability, high cost and low-volume production;
2) Optimize the design strategy of composite materials based on MXene.
3) Combining different types of materials to optimize the design of complex structures to further improve flexibility and tensile and compressive strength.
4) Develop multi-functional, high-performance integrated sensors.
5) In-depth understanding of the relationship between the structure and performance of MXene-based flexible materials.
6) Wearable comfort (such as breathability/sweat permeability) and better user experience
7) Further optimize the non-contact and human-computer interaction of wearable devices.