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Title: Computational Dissection of Two-Dimensional Rectangular Titanium Mononitride TiN: Auxetics and Promises for Photocatalysis

Journal Article · · Nano Letters

Recently, two-dimensional (2D) transition-metal nitrides have triggered an enormous interest for their tunable mechanical, optoelectronic, and magnetic properties, significantly enriching the family of 2D materials. Here, by using a broad range of first-principles calculations, we report a systematic study of 2D rectangular materials of titanium mononitride (TiN), exhibiting high energetic and thermal stability due to in-plane d–p orbital hybridization and synergetic out-of-plane electronic delocalization. The rectangular TiN monolayer also possesses enhanced auxeticity and ferroelasticity with an alternating order of Possion’s Ratios, stemming from the competitive interactions of intra- and inter- Ti—N chains. Such TiN nanosystem is a n-type metallic conductor with specific tunable pseudogaps. Halogenation of TiN monolayer downshifts the Fermi level, achieving the optical energy gap up to 1.85 eV for TiNCl(Br) sheet. Overall, observed electronic features suggest that the two materials are potential photocatalysts for water splitting application. Furthermore, these results extend emerging phenomena in a rich family 2D transition-metal-based materials and hint for a new platform for the next-generation functional nanomaterials.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1374357
Report Number(s):
LA-UR-17-23312
Journal Information:
Nano Letters, Vol. 17, Issue 7; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 85 works
Citation information provided by
Web of Science

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Cited By (21)

Computational screening of MX ( M   =  Ga, Ge, Sn, In; X   =  As, Se) van der Waals heterostructures as suitable candidates for solar cells journal June 2019
Photoexcited charge carrier behaviors in solar energy conversion systems from theoretical simulations journal August 2019
Auxetic deformation of the weft-knitted Miura-ori fold journal September 2019
Negative Poisson's ratio and high-mobility transport anisotropy in SiC 6 siligraphene journal January 2018
Ferroelastic lattice rotation and band-gap engineering in quasi 2D layered-structure PdSe 2 under uniaxial stress journal January 2019
Novel titanium nitride halide TiNX (X = F, Cl, Br) monolayers: potential materials for highly efficient excitonic solar cells journal January 2018
Strain-tunable CO 2 storage by black phosphorene and α-PC from combined first principles and molecular dynamics studies journal January 2019
An organoferroelasticity driven by molecular conformational change journal January 2018
Intriguing electronic insensitivity and high carrier mobility in monolayer hexagonal YN journal January 2018
Two-dimensional ferroelastic semiconductors in single-layer indium oxygen halide InOY (Y = Cl/Br) journal January 2019
A two-dimensional tetragonal yttrium nitride monolayer: a ferroelastic semiconductor with switchable anisotropic properties journal January 2018
Activated layered magnetism from bulk TiN journal December 2019
Controllability of coercive stress in organoferroelasticity by the incorporation of a bulky flipping moiety in molecular crystals journal January 2018
Highly negative Poisson's ratio in a flexible two-dimensional tungsten carbide monolayer journal January 2018
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Discovery of a ferroelastic topological insulator in a two-dimensional tetragonal lattice journal January 2019
Computational methods for 2D materials: discovery, property characterization, and application design journal November 2017
Analysis of the Deformation Behavior and Mechanical Properties of Slit‐Perforated Auxetic Metamaterials journal December 2018
Designing half-metallic ferromagnetism by a new strategy: an example of superhalogen modified graphitic C 3 N 4 journal January 2018

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