Progress and prospects of aberration-corrected STEM for functional materials.

Area of Science:

• Materials Science
• Nanotechnology
• Physics

Background:

• Aberration-corrected scanning transmission electron microscopy (STEM) offers unprecedented atomic resolution for materials characterization.
• Functional materials with complex structures are crucial for advanced applications and require sophisticated analysis techniques.

Purpose of the Study:

• To showcase the capabilities of aberration-corrected STEM for analyzing functional materials at the atomic level.
• To demonstrate the technique's application in understanding structure-property relationships and material dynamics.

Main Methods:

• Utilizing aberration-corrected scanning transmission electron microscopy (STEM) for high-resolution imaging and spectroscopy.
• Employing Z-contrast imaging, electron energy loss spectroscopy (EELS), and low-voltage STEM.
• Analyzing piezoelectric materials, functional oxide interfaces, MOF-derived catalysts, and 2D materials.

Main Results:

• Atomic-resolution polarization mapping revealed coexisting ferroelectric phases in piezoelectric systems.
• Quantitative STEM and EELS elucidated coupling mechanisms at functional oxide interfaces.
• Defects in 2D materials and dynamic atomic behavior in MoS2 vacancies were visualized, demonstrating nanofabrication potential.

Conclusions:

• Aberration-corrected STEM is a powerful platform for characterizing diverse functional materials with atomic precision.
• The technique provides insights into complex phenomena like ferroelectricity, charge coupling, and defect behavior.
• Emerging techniques like 4D STEM promise further advancements in understanding structure-function linkages.