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. 2014 Apr 25;4:4794. doi: 10.1038/srep04794

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(a) Schematic of rhombohedral layer structure held together by weak van der Waals interactions in Bi₂Se₃. Each QL consists of five covalently bonded atomic sheets along the z axis in the order of Se-Bi-Se-Bi-Se. (b), (c) SEM and TEM images of as-synthesized bulk Bi₂Se₃. (d) Photographs of Bi₂Se₃ dispersed in NMP and CS-HAc before and after sonication.