Large piezoelectric response in ferroelectric/multiferroelectric metal oxyhalide MOX₂ (M = Ti, V and X = F, Cl and Br) monolayers

Abstract

Flexible two-dimensional (2D) piezoelectric materials are promising for applications in wearable electromechanical nano-devices such as sensors, energy harvesters, and actuators. A large piezo-response is required for any practical applications. Based...

Multiferroicity in 2D MSX2 (M = Nb and Zr; X = Cl, Br, and I)

“…MSX 2 has four atoms in a unit cell, including one metal atom (M = Zr and Nb), one sulfur atom and two halogen atoms (X = Cl, Br, and I). Similar to 2D TiOX 2 , VOX 2 , and VOXY, 4,53 in-plane off-center displacement of metal atoms leads to multiferroic behavior. The FE phases with the space group of Pmm2 (No.…”

“…2D multiferroics have been attracting much attention due to their promising properties such as high spontaneous FE polarization, [1][2][3][4] photovoltaic effects, [5][6][7][8] and high-temperature magnetism. 9 FE materials, such as BiFeO 3 10 and BaTiO 3 , [11][12][13] have demonstrated outstanding potential for memory storage and integrated microelectrons.…”

Hybrid Piezo-Capacitive Multimodal Sensors Based on Polyurethane–Poly(vinylidene fluoride) Nanofibers for Wearable E-Textiles

“…Therefore, they can also be utilized as temperature sensors . There are many kinds of piezoelectric materials, mainly ceramics, polymers, and 2D materials like MoS 2 . Most commonly used ceramic materials, such as KNN, ZnO, BaTiO 2 , and PZT, have extremely high piezoelectric coefficients while also being extremely brittle and some of them being harmful to the environment.…”

Novel Piezoelectricity in Two-Dimensional Metallic/Semimetallic Materials with Out-of-Plane Polarization

“…18 2D multiferroelectric material VOX 2 (X = F, Cl, and Br) monolayer can couple its piezoelectricity with ferroelectricity and ferromagnetism, which is promising for self-powered, flexible, and wearable piezo-devices. 19 Third, piezoelectricity can be combined with a nontrivial band topology. For example, large piezoelectric coefficients were predicted in InXO (X = Se, Te) monolayers, a kind of quantum spin Hall insulators with nonzero Z 2 topological invariants.…”

“…For example, 12 M 2 CT 2 MXenes were predicted to possess ferroelectric (or antiferroelectric) phases and piezoelectricity . 2D multiferroelectric material VOX 2 (X = F, Cl, and Br) monolayer can couple its piezoelectricity with ferroelectricity and ferromagnetism, which is promising for self-powered, flexible, and wearable piezo-devices . Third, piezoelectricity can be combined with a nontrivial band topology.…”