(Funded by the National Science Foundation and the U.S. Department of Energy)
Researchers from the U.S. Department of Energy’s Princeton Plasma Physics Laboratory and the University of Delaware have provided new insights into the variations that can occur in the atomic structure of two-dimensional materials called transition metal dichalcogenides (TMDs). The researchers found that one of the defects, which involves hydrogen, provides excess electrons. The other type of defect, called a chalcogen vacancy, is a missing atom of oxygen, sulfur, selenium, or tellurium. By shining light on the TMD, the researchers showed unexpected frequencies of light coming from the TMD, which could be explained by the movement of electrons related to the chalcogen vacancy.

(Funded by the U.S. Department of Energy)
Researchers from Drexel University, California State University Northridge, and the U.S. Department of Energy’s Lawrence Berkeley National Laboratory have provided the first clear look at the chemical structure of the surface of a two-dimensional (2D) material called titanium carbide MXene. MXenes form a family of 2D materials that have shown promise for water desalination, energy storage, and electromagnetic shielding. “Getting the first atomic-scale look at their surface, using scanning tunneling microscopy, is an exciting development that will open new possibilities for controlling the material surface and enabling applications of MXenes in advanced technologies,” said Yury Gogotsi, the researcher who led this study.

(Funded by the National Institutes of Health, the National Science Foundation, and the U.S. Department of Energy)
Researchers from The University of Texas at Austin, Baylor University, Penn State, the University of California, Berkeley, the U.S. Department of Energy’s Lawrence Berkeley National Laboratory, and Tohoku University in Japan have developed a way to blast the molecules in plastics and other materials with a laser to break them down into their smallest parts for future reuse. The discovery, which involves laying these materials on top of two-dimensional (2D) materials and then lighting them up, has the potential to improve how we dispose of plastics that are nearly impossible to break down with today’s technologies. “By harnessing these unique reactions, we can explore new pathways for transforming environmental pollutants into valuable, reusable chemicals, contributing to the development of a more sustainable and circular economy,” said Yuebing Zheng, one of the researchers involved in this study.