Scientists now able to map defects in 2D crystals in
liquid

Monolayer crystals, often being referred as 2D
crystals or 2D materials, possess the unique characteristic of
having a single layer of regular atomic structure. And the more
regular the structure is, the higher quality the crystal. In some
cases, the atomic structure is repeated to perfection, but most of
the time—as is usually the case in nature—there are some
flaws.