MXene‐Induced Flexible, Water‐Retention, Semi‐Interpenetrating Network Hydrogel for Ultra‐Stable Strain Sensors with Real‐Time Gesture Recognition

Abstract

As water‐saturated polymer networks, hydrogels are a growing family of soft materials that have recently become promising candidates for flexible electronics application. However, it remains still difficult for hydrogel‐based strain sensors to achieve the organic unity of mechanical properties, electrical conductivity, and water retention. To address this challenge, based on the template, the excellent properties of MXene nanoflakes (rich surface functional groups, high specific surface area, hydrophilicity, and conductivity) are fully utilized in this study to prepare the P(AA‐co‐AM)/MXene@PDADMAC semi‐interpenetrating network (semi‐IPN) hydrogel. The proposed hydrogel continues to exhibit excellent strain response and flexibility after 30 days of storage at room temperature, and its performance do not decrease after 1100 cycles. Considering these characteristics, a hydrogel‐based device for converting sign language into Chinese characters is successfully developed and optimized using machine learning. Therefore, this study provides novel insight and application directions for hydrogel families.

Multi-interface Combination of Bimetallic Selenide and V4C3Tx MXene for High-Rate and Ultrastable Sodium Storage Devices

“…Recently, two-dimensional (2D) transition metal–carbon nitrides (MXenes) attracted considerable attention for electrochemical energy storage applications due to its layered structures, charming electrical conductivities, abundant functional groups, and high specific surface areas. , Among them, V 4 C 3 T x stands out because of its multilayered structure, which provides better thermal stability and higher electrical conductivity than other MXene materials (Figure S1 and Supplementary Note S1). , However, random distribution of terminal groups (such as hydroxyl and fluorine anions) on the MXene surface leads to an uneven surface charge distribution, which hinders interfacial cross-linking between adjacent MXene sheets .…”

Binary Ni–Cu nanocomposite-modified MXene-adorned 3D-nickel foam for effective overall water splitting and supercapacitor applications

“…Due to the presence of oxygenated groups in MXene, the peak for the hydrogen bond was observed at 2068 cm −1 , while the peak at 2330 cm −1 corresponds to the hydroxyl group. The peaks observed at around 1504 cm −1 correspond to the asymmetric stretching vibrations of the carboxyl functional group on MXene, 38,39 whereas the peaks at 470 cm −1 , 540 cm −1 and 601.8 cm −1 correspond to the Ni–O vibration, Cu–O vibration, 40 and deformation vibration of the Ti–O bond, respectively. 41 It was determined that the vibrations of the adsorbed CO 2 were responsible for the peaks centred at 2113 cm −1 .…”

Industrially Scalable Textile Sensing Interfaces for Extended Artificial Tactile and Human Motion Monitoring without Compromising Comfort

“…Prolonged monitoring of biomechanics across extensive regions of the human body is critical to assess comprehensive physiological performance for early prevention and treatment of diseases and is also essential for customized service by individual behavior patterns. The development of wearable tactile sensors with excellent flexibility and skin-compatibility enables the convenient measurement of human biomechanical signals, showing great application prospects in health care, , biometric monitoring, − and human–machine interactions. , Advances in flexible materials, − structure design, − and layered composites , have paved the way for the evolution and innovation of tactile sensors and flexible electronics. However, current tactile sensors made from flexible membrane materials are confronted with the concurrent challenge of fulfilling the demands for conformability, breathability, and moisture permeability to ensure prolonged wearing comfort.…”