A synergetic stabilization and strengthening strategy for two-dimensional ordered hybrid transition metal carbides

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F18%3A10240141" target="_blank" >RIV/61989100:27640/18:10240141 - isvavai.cz</a>

Alternative codes found

RIV/61989100:27740/18:10240141 RIV/61989100:27740/18:10242320

Result on the web

<a href="https://pubs.rsc.org/en/Content/ArticleLanding/2018/CP/C8CP06458J#!divAbstract" target="_blank" >https://pubs.rsc.org/en/Content/ArticleLanding/2018/CP/C8CP06458J#!divAbstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c8cp06458j" target="_blank" >10.1039/c8cp06458j</a>

Result language

angličtina

Original language name

A synergetic stabilization and strengthening strategy for two-dimensional ordered hybrid transition metal carbides

Original language description

Two-dimensional (2D) transition metal carbides (MXenes) exhibit excellent thermodynamic stability and remarkable mechanical strength and flexibility, as well as rich functionality, which attract considerable interest due to their potential application for high-performance flexible and stretchable devices. However, premature phonon instability of some non-hybrid MXenes was recently found to intrinsically limit their strength and flexibility, evoking passionate curiosity in pursuing an effective solution for more impressive mechanical properties. In this work, on the basis of an alloying strengthening mechanism, a combinational strategy is proposed to build ordered hybrid M2MC2O2 (M = Mo, W; M = Ti, Zr, Hf) with remarkable dynamic stability and superior mechanical properties by hindering the premature phonon instability originating from the outer transition metals. By means of comprehensive screening, symmetrical-Mo2TiC2O2 is interestingly found to possess excellent stability at equilibrium and outstanding tolerance to phonon instability during straining compared to its Ti counterpart, being attributed to the character of the robust Mo-d(z)(2) and O-p(z) hybridization. Although similar optical phonon soft modes appear in Ti3C2O2 and Mo2TiC2O2 under multiple loadings, the latter is much stiffer during straining. An in-depth analysis of deformed electronic structures reveals that a strain-induced increasing density of states in the vicinity of the Fermi level mainly composed of Mo-d(z)(2) states facilitates the fatal phonon softening in Mo2TiC2O2 under biaxial tension, while differing from the mechanical instability in Ti3C2O2 triggered by a Peierls transition. Our findings provide a novel stabilization and strengthening strategy for 2D materials, and pave a new way for searching for 2D material candidates in designing flexible devices.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

—

Volume of the periodical

20

Issue of the periodical within the volume

47

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

29684-29692

UT code for WoS article

000452484800008

EID of the result in the Scopus database

2-s2.0-85058173766