Atomic-scale dynamics of the phase transition in bilayer PtSe2. Issue 15 (6th April 2021)

• Record Type: Journal Article
• Authors: Xu, Lei; Wang, Lifen; Liu, Huan; Li, Feng; Li, Delong; Cao, Yongwan; Wu, ChenChen; Bai, Xuedong; Qi, Junjie
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 15(2021)
• Page Start: 5261
• Page End: 5266
• Publication Date: 2021-04-06
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc05710j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Understanding the mechanism of phase transition is of great importance for modulating the physical properties and realizing the potential applications of two-dimensional (2D) materials. Abstract : Understanding the mechanism of phase transition is of great importance for modulating the physical properties and realizing the potential applications of two-dimensional (2D) materials. Herein, by performing in situ experiments in an atomic resolution scanning transmission electron microscope (STEM), it is found that the 2H → 1T and 2H → N phase transition can be observed in bilayer PtSe2 under electron beam irradiation. The phase transition can be tracked in real time which enables in-depth analysis of the transformation mechanism. It is revealed that both interlayer and intralayer gliding occurred during the transition process in bilayer PtSe2 . In addition, the intralayer shift requires a longer electron beam irradiation time to complete due to the stronger intralayer covalent bond strength. These mechanistic insights may provide a fundamental understanding for development and optimization of PtSe2 .