Pressure confinement effect in MoS2 monolayers

文献情報

出版日 2015-04-14

DOI 10.1039/C5NR00580A

インパクトファクター 7.79

著者

Fangfei Li, Yalan Yan, Bo Han, Liang Li, Xiaoli Huang, Mingguang Yao, Yuanbo Gong, Xilian Jin, Baoli Liu, Chuanrui Zhu, Qiang Zhou, Tian Cui

原文を見る

要旨

With ever increasing interest in layered materials, molybdenum disulfide has been widely investigated due to its unique optoelectronic properties. Pressure is an effective technique to tune the lattice and electronic structure of materials such that high pressure studies can disclose new structural and optical phenomena. In this study, taking MoS2 as an example, we investigate the pressure confinement effect on monolayer MoS2 by in situ high pressure Raman and photoluminescence (PL) measurements. Our results reveal a structural deformation of monolayer MoS2 starting from 0.84 GPa, which is evidenced by the splitting of E12g and A1g modes. A further compression leads to a transition from the 1H-MoS2 phase to a novel structure evidenced by the appearance of two new peaks located at 200 and 240 cm−1. This is a distinct feature of monolayer MoS2 compared with bulk MoS2. The new structure is supposed to have a distorted unit with the S atoms slided within a single layer like that of metastable 1T′-MoS2. However, unlike the non-photoluminescent 1T′-MoS2 structure, our monolayer shows a remarkable PL peak and a pressure-induced blue shift up to 13.1 GPa. This pressure-dependent behavior might enable the development of novel devices with multiple phenomena involving the strong coupling of the mechanical, electrical and optical properties of layered nanomaterials.

掲載誌

Nanoscale

CiteScore: 12.1

自己引用率: 5.2%

年間論文数: 1681

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