an0c00119_si_001.pdf (2.17 MB)
Waved 2D Transition-Metal Disulfides for Nanodevices and Catalysis: A First-Principle Study
journal contribution
posted on 2020-03-13, 21:16 authored by Youchao Kong, Haoqiang Ai, Wei Wang, Xiuhua Xie, Kin Ho Lo, Shuangpeng Wang, Hui PanTwo-dimensional
(2D) transition-metal dichalcogenides (TMDs) monolayers
have found various applications spanning from electronics in physics
to catalysis in chemistry due to their unique physical and chemical
properties. Here, the effect of structure engineering on the physical
and chemical properties of transition-metal disulfide monolayers (MS2) is systematically investigated based on density functional
theory (DFT) calculations. The calculation results show that waved
MS2 (w-MS2) can be achieved under compression
due to the zero in-plane stiffness, leading to high flexibility within
a wide range of compression. The bandgap and conductivity of semiconducting
w-MS2 are reduced because the d orbitals of transition-metal
elements become more localized as the curvature increases. A transition
from a direct band to an indirect one is observed in w-MoS2 and w-WS2 after a critical strain. We further demonstrate
the structure engineering can modulate the magnetism of w-VS2, leading to nonuniform distribution of magnetic moments along the
curvature. Furthermore, we find that waved TMDs show reduced Gibbs
free energy for hydrogen adsorption, resulting in enhanced catalytic
performance in hydrogen reaction evolution (HER). It is expected that
the waved 2D TMDs may find applications into various areas, such as
nanodevices and catalysis.