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(a–c) TEM images and size distributions of Fe3O4 nanoparticles (NPs) with the different mean diameters of 20 nm, (a) σ = 16%, 25 nm (b) σ = 19% and 40 nm (c) σ = 10%. The size distributions show that the synthesized Fe3O4 NPs had a narrow size distribution. (d) Electron diffraction (ED) patterns of the 20-nm Fe3O4 NPs. Reproduced with permission from [27]. American Chemical Society, 2008.
