Se‐Ho Kim

“Ja atoms! Ja atoms!” shouted Erwin Müller upon first observing individual atoms using Field ion microscopy (FIM), a landmark in atomic-scale imaging. Since then, FIM has profoundly impacted materials science, offering unmatched atomic resolution through electric-field-induced ionization. This review systematically explores FIM’s theoretical foundations, historical evolution, and instrumental developments. Despite modern imaging methods, FIM uniquely reveals atomic surface dynamics, arrangements

High Resolution Image Download MS PowerPoint Slide MoS 2 nanomaterials have been identified as a cost-effective and earth-abundant alternative to platinum-group metals for electrocatalytic hydrogen evolution. Chemical exfoliation of bulk semiconducting 2H-MoS 2 by lithium intercalation is widely employed to synthesize metallic 1T-MoS 2 nanosheets with enhanced basal plane activity and improved charge transport. While the catalytic benefits of this phase transition are well established, the mecha

Atom probe tomography (APT) has emerged as a powerful analytical technique capable of reconstructing three-dimensional compositional and structural information at the atomic scale. This paper provides a comprehensive review of the historical development of APT, structured around four key stages: Field emission microscopy, Field Ion Microscopy, Field Desorption Microscopy, and the eventual advent of APT. Foundational work by Erwin Müller laid the groundwork for APT through innovations in electron

Hydrogen-based iron reduction is often described as a cleaner process, but real ores behave heterogeneously across multiple length scales. Bulk measurements alone cannot capture how atoms move, where oxygen remains, or how impurities redistribute. Here, we discuss several approaches that can be used to study ore chemistry using microscopy, resolving nanoscale features such as sharp oxide-metal interfaces, near-complete local metallization, and retained impurity-rich domains. Complementary techni