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![Mutual rotation of two monolayers of a semiconducting material creates a variety of bilayer stacking patterns, depending on the twist angle. Fast and efficient characterization of these stacking patterns may aid exploration of potential applications Mutual rotation of two monolayers of a semiconducting material creates a variety of bilayer stacking patterns, depending on the twist angle. Fast and efficient characterization of these stacking patterns may aid exploration of potential applications](/sites/default/files/styles/list_page_thumbnail/public/news/images/16-G00183_no_bkgrnd_.png?itok=lKUrpWJ_)
Stacking layers of nanometer-thin semiconducting materials at different angles is a new approach to designing the next generation of energy-efficient transistors and solar cells. The atoms in each layer are arranged in hexagonal arrays.
![Researchers developed a framework to learn physical and chemical phenomena defining nanocrystal growth from scanning transmission electron microscopy. Researchers developed a framework to learn physical and chemical phenomena defining nanocrystal growth from scanning transmission electron microscopy.](/sites/default/files/styles/list_page_thumbnail/public/news/images/levy%20tip.jpg?itok=0nmw1Ue8)
To tailor tiny nanocrystals for catalysts, semiconductors and other applications, scientists must predict what happens inside the particle, at the boundary and in the solvent during particle growth.
![Cantilever schematic: Schematic representation of the atomic force microscope interacting with the material surface. (Credit: Rama Vasudevan, ORNL) Cantilever schematic: Schematic representation of the atomic force microscope interacting with the material surface. (Credit: Rama Vasudevan, ORNL)](/sites/default/files/styles/list_page_thumbnail/public/news/images/cantilever-schematic%5B1%5D_0.jpg?itok=kM_EpMlx)
Understanding where and how phase transitions occur is critical to developing new generations of the materials used in high-performance batteries, sensors, energy-harvesting devices, medical diagnostic equipment and other applications.