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. 2015 Jun 26;6:7571. doi: 10.1038/ncomms8571

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(a) Schematic illustration, ultraviolet–vis-near-infrared spectrum and TEM image of bipyramids resultant from the purification by depletion flocculation with BDAC. (b) The various sizes of bipyramids are regrown from the original bipyramid seed in a. Bipyramids shown in b (1–5) correspond to spectra 6–10 in c. (c) The normalized extinction spectra of purified (1–5) and regrown bipyramids (6–10) are shown. The inset shows an enlarged spectrum of the LSPR for the purified bipyramids. Full width at half maximum of LSPR peaks were measured as 58, 60, 63, 60, 59, 73, 113, 121, 126 and 154 nm or 21.4, 20.7, 19.7, 20.7, 21.0, 17.0, 11.0, 10.3, 9.8 and 8.1 eV for 1–10, respectively.