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. 2016 Oct 29;6(11):194. doi: 10.3390/nano6110194

Figure 1.

Figure 1

(a,b) Schematic diagram of the crystal structure of black phosphorus. System is relaxed using density functional theory calculation. (c) Close-up showing Scanning Tunneling Microscope (STM) image of the upper atoms of topmost puckered layer of black phosphorus (Reproduced with permission of [14]. Copyright American Chemical Society, 2009). (d) Atomic Force Microscopy (AFM) images of black phosphorus flakes. Estimated layer numbers are indicated in the image and line scans are performed along the colored lines in the AFM image (Reproduced with permission of [23]. Copyright Macmillan Publishers Limited, 2014).