2D crystal matter

Single-layer crystallites of NbSe₂ (a), graphite (b), Bi₂Sr₂CaCu₂O_x (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

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