Prediction of two-dimensional ferroelectric metal Mxenes

Article

Wijethunge, Dimuthu, Zhang, Lei and Du, Aijun. 2021. "Prediction of two-dimensional ferroelectric metal Mxenes." Journal of Materials Chemistry C. 9 (34), pp. 11343-11348. https://doi.org/10.1039/D1TC02213J
Article Title

Prediction of two-dimensional ferroelectric metal Mxenes

ERA Journal ID201060
Article CategoryArticle
AuthorsWijethunge, Dimuthu, Zhang, Lei and Du, Aijun
Journal TitleJournal of Materials Chemistry C
Journal Citation9 (34), pp. 11343-11348
Number of Pages6
Year2021
PublisherThe Royal Society of Chemistry
Place of PublicationUnited Kingdom
ISSN2050-7526
2050-7534
Digital Object Identifier (DOI)https://doi.org/10.1039/D1TC02213J
Web Address (URL)https://pubs.rsc.org/en/content/articlelanding/2021/tc/d1tc02213j/unauth
Abstract

Metals with spontaneous electric polarization have exhibited fascinating characteristics that could improve the performance of nanoelectronics. As of yet, only a few metals with electrical polarization (polar metals) have been discovered. Most of those polar metals are bulk materials, thus, the polarization direction cannot be switched using an external electric field. Here, using first principles calculations, we demonstrate that 2D Nb2NF2, which belongs to the Mxene family, has good reversible out-of-plane electrical polarization and the characteristics of a metal. The ground state structure of ferroelectric 2D Nb2NF2 is unique and a 2D material with such a ground state structure has not been reported elsewhere. Furthermore, 72 2D surface functionalized Mxene compositions (M2XS2:M = Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and Mn; X = C and N; S = O, OH and F) were investigated and only 2D Nb2NF2 showed dynamic and thermal stability in the novel ground state. However, there is a large variety of Mxenes to be explored, therefore, the identified ferroelectric ground state will pave the way to discover novel 2D ferroelectric Mxenes with various attributes. Showing metallicity and ferroelectricity simultaneously, 2D Nb2NF2 can play a major role in designing next generation materials with extraordinary properties.

Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020401807. Nanomaterials
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