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. 2015 Aug 6;6:8003. doi: 10.1038/ncomms9003

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(a) Schematic illustration of the synthesis of Fe-CPNDs. (b) TEM micrograph (scale bar, 20 nm) and (c) high-resolution TEM micrograph of Fe-CPNDs (scale bar, 5 nm). (c, inset) The corresponding FFT pattern of Fe-CPNDs. (d,e) AFM topography images of Fe-CPNDs. (f) The height profile along the line marked in the AFM image (e).