Recently, there has been a huge demand for flexible pressure sensors in various fields, including smart wearable textiles, health detection, and electronic skin. Flexible pressure sensors have been developed with high sensitivity, wide sensing range, rapid response time, and excellent cycling stability. Currently, emerging conductive materials include two-dimensional transition metal carbides and nitrides (MXenes). These materials have attracted immense attention in the field of flexible pressure sensors due to their high electrical conductivity, large specific surface area, and satisfactory hydrophilicity. This review highlights different preparation methods of MXene composites. It also summarizes the nanostructure design of pressure-sensitive materials to improve the performance of flexible pressure sensors for soft electronics applications. This review provides a comprehensive overview of the progress of MXene composites and their prospects in the area of flexible pressure sensors and summarizes the applications and challenges of these sensors in intelligent wearables. This review also proposes some suggestions for developing a new generation of intelligent textiles.

Blended electromagnetic shielding (EMS) fabrics of cotton/stainless steel/polyester have been widely applied. The porous structure of the fabric is the guarantee of its good comfort performance, but it also hinders the improvement of shielding efficiency and the endowing of wave absorption performance. To solve the above problems, this paper proposes a mixed resistance field based on fabric pores by the construction of multi-layer MXenes. Ti3AlC2 is etched by hydrochloric acid and lithium fluoride to generate hydrofluoric acid in situ to prepare multi-layer Ti3C2T x. The finishing experiments are designed to finish the fabric around the pores with Ti3C2T x impregnation. The enhancement effect and mechanism of the mixed resistance field on the shielding effectiveness and wave absorbing properties of the fabric are analyzed. The result shows that the multi-layer Ti3C2T x for textile finishing is prepared quickly and effectively using the proposed method. The micro media of the Ti3C2T x in the dispersion are adsorbed on the surface of various fibers, most of which are cotton fibers. The shielding effectiveness of the finished EMS fabric is improved significantly in the frequency ranges of 6.57–14 GHz and 11.97–18 GHz. The wave absorbing performances in the frequency range of 11.97–18 GHz are excellent. It is proved that the effect of the mixed resistance field of the pores was satisfactory. This paper provides a new way for the application of Ti3C2T x in EMS fabric, solves the disadvantages caused by pores, and can provide a reference for the design and production of wave absorbing EMS fabric.

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With the rapid development of wearable electronic textiles, the study of flexible wearable energy storage devices has been pushed to the forefront. The discovery of two-dimensional (2D) MXene materials provides ideas and materials for the study of flexible wearable energy storage devices. Combining the excellent properties of MXene with a fiber/ fabric can provide a good strategy for flexible energy storage equipment and other functional fibers and fabrics. This paper reviews the fabrication of MXene-based fibers/fabrics and their research progress as flexible supercapacitors (SCs). First, this paper discusses the preparation, properties, and development of 2D MXene materials. Then, five methods for manufacturing MXene-based fibers are summarized, and the fiber properties are analyzed, which is very important for the further application of MXene-based fibers. Furthermore, the assembly and performance analysis of MXene-based flexible fiber SCs, fabric SCs, and other types of SCs are reviewed. Finally, the potential, challenges, and future opportunities for the preparation of MXene-based fibers and flexible fiber/fabric SCs are discussed.

Knitted electromagnetic shielding fabric is widely used for its excellent extensibility and permeability. However, the influence law and mechanism of the effect of needle loops on the shielding effectiveness of fabrics is still unclear. In this paper, we designed five kinds of knitted fabrics. They are plain single jersey, ‘1 × 1’ rib knitted fabric, ‘2 × 2’ rib knitted fabric, interlock knitted fabric, and full Milano structure. The shielding effectiveness adopts the flange coaxial test. Based on the electromagnetic theory principle, the influence law and mechanism of needle loop arrangement form, needle loop length, metal material, and metal amount on the shielding effectiveness of knitted fabrics were analyzed. Therefore, it can be concluded that the arrangement of needle loops dramatically influences the frequency band and shielding performance of knitted fabrics. When there is fewer intermeshing points of needle loops, the less is the shielding effectiveness of the fabric. The needle loop’s length mainly affects the shielding effectiveness of knitted fabric. The small needle loop length has great shielding effectiveness on knitted fabric. Metallic yarns with high amounts and low -resistance are beneficial for improving the shielding effect of the clothing. It provides a reference for the design, production, and related research of electromagnetic shielding knitted fabrics.