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. 2015 Oct 16;6:8572. doi: 10.1038/ncomms9572

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(a) Lattice structure of BP and atomic vibrational patterns of A_g¹, B_2g and A_g² phonon modes. (b) Polarized Raman spectra (right) collected from a BP flake on SiO₂/Si substrate (left) showing the ability of polarized Raman technique to distinguish the armchair and zigzag axes. (c) Scanning electron microscopy image and (d) optical image of the 16.1-nm-thick BP flake suspended on slits. Scale bars, 5 μm (all).