Observation of Gap Opening in 1T' Phase MoS2 Nanocrystals

Nano Letters
Hai XuKian Ping Loh

Abstract

Two-dimensional (2D) transition metal dichalcogenides (TMDs) manifest in various polymorphs, which deliver different electronic properties; the most prominent among them include the semiconducting 2H phase and metallic 1T (or distorted 1T' phase) phase. Alkali metal intercalation or interface strain has been used to induce semiconductor-to-metal transition in a monolayer MoS2 sheet, leading to exotic quantum states or improved performance in catalysis. However, the direct growth of 1T or 1T' phase MoS2 is challenging due to its metastability. Here, we report MBE growth of isolated 1T' and 2H MoS2 nanocrystals on a Au substrate; these nanocrystals can be differentiated unambiguously by their electronic states using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). By studying the initial stages of nucleation during molecular beam epitaxy (MBE) of MoS2, we could identify atomic clusters (30-50 atoms) with intralayer stacking corresponding to 1T' and 2H separately, which suggests a deterministic growth mechanism from initial nuclei. Furthermore, a topological insulator type behavior was observed for the 1T' MoS2 crystals, where an energy gap opening of 80 meV was measured by STS in the basal plane at 5...Continue Reading

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Citations

Oct 26, 2018·Chemical Communications : Chem Comm·Xiaowen ZhouFuqiang Huang
Oct 9, 2019·Physical Chemistry Chemical Physics : PCCP·Augusto C H Da SilvaJuarez L F Da Silva
Oct 16, 2019·Nanoscale·Mohammad Rezwan HabibMingsheng Xu
Mar 21, 2020·Advanced Materials·Can LiuKaihui Liu
Apr 4, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhuojun LiShujie Tang
May 27, 2020·Chemical Society Reviews·Maria S Sokolikova, Cecilia Mattevi
Apr 23, 2020·Scientific Reports·Biswapriyo DasSantanu Mahapatra
Nov 9, 2019·Physical Review Letters·H MineJ Haruyama
Oct 22, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R LonguinhosJ Ribeiro-Soares
Nov 19, 2020·Physical Chemistry Chemical Physics : PCCP·Naidel A M S CaturelloJuarez L F Da Silva
Apr 25, 2021·Advanced Materials·Michael S LodgeBent Weber
Jun 20, 2020·Nano Letters·Konrád KandraiPéter Nemes-Incze
Nov 18, 2021·Physical Chemistry Chemical Physics : PCCP·Jianyi LiuBing Wang

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