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. 2015 Nov 5;6:8844. doi: 10.1038/ncomms9844

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(a) A TEM image of solid core/mesoporous shell SiO₂ particles. (b) A low magnification TEM image and (c) a high-resolution TEM image of hp-SiNSs, showing the Si particles are mostly amorphous, with scattered nanocrystalline domains with a (111) interplanar spacing of 3.13 Å. (d) X-ray diffraction patterns of the hp-SiNSs. (e,f) N₂ isotherms for solid core/mesoporous shell SiO₂ particles and the hp-SiNSs, respectively. Scale bar, 200 nm (a,b) 4 nm (c).