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. 2015 Oct 28;6:8689. doi: 10.1038/ncomms9689

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(a) XRD patterns and (b) Raman spectra of the micro-FeS, core-shell FeS/C nanospheres and yolk-shell FeS@C nanospheres. (c) SEM, (d) TEM and (e) high-resolution TEM images with the corresponding SAED pattern (inset) and (f) scanning TEM (STEM) image with phase mapping for the yolk-shell FeS@C nanospheres.