High flexibility and wide sensing range human health monitoring sensors based on Ti3C2Tx MXene/CNTs/WPU/CNFs composite ink film

Abstract

The traditional wearable sensor has the problem of insufficient sensing coefficient and sensing range. In order to solve these problems, this paper innovatively prepared CNTs and MXene monodisperse waterborne slurry mixed with waterborne thermoplastic polyurethane and nanocellulose to prepare composite ink. The monodisperse CNTs and MXene have good conductive network construction ability, so that when the content of CNTs and MXene in the ink is as low as 0.08%, a stable sensing conductive network can still be formed (conductivity 127s/cm). The low addition of nanomaterials are cost saving along with the influence in conductivity which made the experiment to implement the bonding strength and viscous attributes of the inkjet in printing. The mechanical properties of the composite ink film sensor assembled by ink and medical fabric can be carried out by digital spraying printing technology. The results show that the sensitivity of the MXene/CNTs/WPU/CNFs ink sensor in the tensile test is up to 43.61, and the sensor resistance still shows a linear change under the strain of 0–89%. At the same time, after 2100 fatigue tests, the sensor resistance change remains stable. Finally, the MXene/CNTs/WPU/CNFs ink sensor has also been successful in human monitoring. From monitoring small changes such as finger bending and cervical spine bending to monitoring large movements such as arm flexion and knee bending, the corresponding electrical response can be obtained in time respectively. Therefore, the MXene/CNTs/WPU/CNFs ink sensor has the characteristics of high sensitivity, real-time monitoring and recording, which shows that the research has broad application prospects in the future development.