3. Conclusion
In conclusion, MXene/PDA film-based flexible pressure sensors with low
health risk and high sensitivity are successfully prepared via dopamine
intercalation polymerization. The dopamine molecule embedded in MXene
nanosheets not only increases the layer spacing of MXene but also acts
as a linker to form a 3D cross-linked structure, effectively improving
the mechanical and pressure-sensing performance of the device. The
sensor has excellent sensitivity (S1=24.7kPa-1;
S2=138.8 kPa-1) and a relatively short
response/recovery time (<100ms/<50 ms). Flexible
pressure sensors can be safely applied to human skin to collect various
human vital signs, including biological signs that show tiny
deformations, for example, finger bending, pulse, facial expressions and
vocalization. This demonstrates the immense potential of MXene/PDA-based
sensing materials for artificial skin and wearable devices.