Piezoelectricity in monolayer MXene for nanogenerators and piezotronics

The piezoelectric properties of two-dimensional (2D) materials have been widely studied due to their broad application prospects. MXene, one of the well-known 2D material members, is predicted to be a highly directional piezoelectric material with a non-centrosymmetric lattice structure. Here, the first experimental study of piezoelectric responses of the monolayer Ti(3)C(2)Tx MXene is reported, showing that the cyclic strain excites stable oscillating piezoelectric voltage and current outputs. The functional groups on the surface of the MXene break the inversion symmetry of lattice structures to possess piezoelectric properties. The piezoelectricity in the armchair direction of the Ti(3)C(2)Tx MXene sheet exhibits an intrinsic current output of 0.3 nA at 1.08% tensile strain, corresponding to the 6.5 mW/m(2) power density and the 11.15% conversion efficiency, which are all higher than that of previous reported 2D materials. Further, theoretical calculations of the MXene have explained the origin of piezoelectric polarizations among the multi-atomic structure and the surface functional groups. The discovery of the piezo-MXene can lead to the foundation for the understanding and applications of the Ti(3)C(2)Tx MXene in powering nanodevices and stretchable electronics.

Automated summary

This study reports the first experimental investigation of the piezoelectric responses of monolayer Ti(3)C(2)Tx MXene, showing high current output and conversion efficiency in the armchair direction. The theoretical calculations also explain the origin of the piezoelectric properties in MXene, providing a foundation for future applications in nanodevices and stretchable electronics.