Novel nano-carbon airgel elastic connections based on the material prepared MXene nanosheet

With the development of flexible devices and wearable devices, flexible carbon material has been widespread concern national researchers. Although various methods have been developed at present is obtained having good compressibility, elasticity carbon material, prepared in both high compression, high resilience, fatigue, a wide range of linear carbon material sensitivity remain very challenging. MXene as a novel nano-dimensional sheet materials having a high specific surface area, good conductivity and mechanical strength advantage, stored in the sensor, energy, and aspects of the electrocatalytic like having an electromagnetic shielding potential applications. However, due to the lack of a sufficiently strong interaction between nanosheets, leading to build MXene macro structure material with good mechanical properties with a great challenge. Recently, South China University of New Zhong et al in MXene (Ti3C2) nanosheet as matrix materials, bacterial cellulose (Bacterial Cellulose; BC), a new elastic carbon airgel (FIG. 1) nano-connecting material was prepared. Since BC has a high length / diameter ratio, the freeze-drying process may be entangled with each other by connecting the MXene sheet to form a continuous, ordered lamellar structure. In addition, hydrogen bonding between the BC and BC between MXene and increases the mechanical properties of the composite airgel. Due to these structural characteristics, not only the carbon airgel having ultra-high compressibility (compression limit of 99%, corresponding to full compression), the lower elastic fatigue resistance (at 50% strain, after 100,000 compression cycles highly conserved 93.3 % stress retention 73.6%), and having a wide range of linear sensitivity (stress and strain in the range of 0-10 kPa and linear 0-95%) and ultra-high ability to detect small distortion, slight pressure (stress detection limit of 1.0, respectively, Pa). After the carbon airgel is assembled into a simple electronic device can be realized on vocal sound, sensitive detection of motion and other human biological pulse beat signal, shows an important application in the pressure sensing value, wearable electronic devices, etc. . Related papers published in Chemistry of Materials, first author of the paper for Chenze Hong, Zhong Lin new, Peng Xinwen common Corresponding author. Figure 2 shows that pure carbon airgel MXene disordered structure fragments (FIG. 2A), and the compression performance is poor (FIG. 2d). BC is connected to nano-sheet MXene nano material, carbon airgel composite forms a continuous, ordered sheetLayer structure (FIG. 2C); the structure has excellent compression performance (FIG. 2F), at 99% strain may be compression cycle more than 100 times, at 50% strain cycle compression kept its original height after 100,000, exhibited excellent compressibility and fatigue resistance (FIG. 3). Thanks to the unique lamellar structure and the excellent mechanical properties of the carbon airgel is not only high sensitivity, linearity, wide linear range (0-10 Pa linear sensitivity 12.5 kPa-1), and the stress detection to small limit up to 1.0 Pa, having excellent sensor properties (FIG. 4). The removal of human joint activity, pulse rate pronunciation and sensitively detecting and after assembling a simple sensor. Document link: Compressible, Elastic, and Pressure-Sensitive CarbonAerogels Derived from 2D Titanium Carbide Nanosheets and Bacterial Cellulosefor Wearable Sensors.Chem.Mater.2019,31,9,3301-3312