Interfacial piezoelectric polarization locking in printable Ti3C2Tx MXene-fluoropolymer composites

NA Shepelin and PC Sherrell and EN Skountzos and E Goudeli and JZ Zhang and VC Lussini and B Imtiaz and KAS Usman and GW Dicinoski and JG Shapter and JM Razal and AV Ellis, NATURE COMMUNICATIONS, 12, 3171 (2021).

DOI: 10.1038/s41467-021-23341-3

Piezoelectric fluoropolymers convert mechanical energy to electricity and are ideal for sustainably providing power to electronic devices. To convert mechanical energy, a net polarization must be induced in the fluoropolymer, which is currently achieved via an energy-intensive electrical poling process. Eliminating this process will enable the low- energy production of efficient energy harvesters. Here, by combining molecular dynamics simulations, piezoresponse force microscopy, and electrodynamic measurements, we reveal a hitherto unseen polarization locking phenomena of poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) perpendicular to the basal plane of two-dimensional (2D) Ti3C2Tx MXene nanosheets. This polarization locking, driven by strong electrostatic interactions enabled exceptional energy harvesting performance, with a measured piezoelectric charge coefficient, d(33), of -52.0 picocoulombs per newton, significantly higher than electrically poled PVDF-TrFE (approximately -38 picocoulombs per newton). This study provides a new fundamental and low-energy input mechanism of poling fluoropolymers, which enables new levels of performance in electromechanical technologies. Fluoropolymers are state-of-the-art flexible piezoelectric materials, yet require massive energy inputs to function. Here, the authors show that the electrostatic field around a 2D material leads to polarization orientation and maximized piezoelectric performance, without external energy input.

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