Atomic-Scale Insights into the 2D Materials from Aberration-Corrected Scanning Transmission Electron Microscopy:...

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Physics

Background:

• Two-dimensional (2D) crystals possess unique properties highly dependent on synthesis conditions.
• Crystal lattice defects like vacancies and dopants significantly impact 2D material properties.
• Understanding atomic structure is crucial for tailoring 2D material performance.

Purpose of the Study:

• To review the application of aberration-corrected scanning transmission electron microscopy (AC-STEM) for atomic-scale characterization of 2D materials.
• To summarize current findings on various 2D materials including graphene, boron nitride, transition metal dichalcogenides, MXenes, and phosphorene.
• To discuss future prospects of AC-STEM in 2D materials research, incorporating machine learning.

Main Methods:

• Utilizing aberration-corrected scanning transmission electron microscopy (AC-STEM) for high-resolution imaging.
• Analyzing atomic structures and defects in diverse 2D crystalline materials.
• Reviewing published studies employing AC-STEM for 2D material investigation.

Main Results:

• AC-STEM provides unprecedented atomic-scale resolution for studying 2D crystal structures.
• Detailed insights into defects, heterointerfaces, and ferroelectricity in 2D materials have been achieved.
• AC-STEM enables in situ observations of dynamic processes in 2D materials.

Conclusions:

• AC-STEM is an indispensable tool for atomic-scale characterization of 2D materials.
• Future research directions include integrating machine learning with AC-STEM for accelerated discovery.
• Continued application of AC-STEM will unlock new possibilities in 2D materials science.