2D crystal matter
Single-layer crystallites of NbSe2 (a), graphite (b),
Bi2Sr2CaCu2Ox (c), and MoS2 (d) visualized by AFM (a and b), by scanning
electron microscopy (c), and in an optical microscope (d). (All scale bars: 1 micron.)
Image and text: Proc. Natl. Acad. Sci. 2005 102 10451