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Transmission electron microscopy (TEM) images of Fe-Au heterodimers with different particles sizes. 15–4 nm Fe-Au heterodimers (a), 7–13 nm Fe-Au heterodimers (b), and 11–10 nm Fe-Au heterodimers (c), scale bars: 50 nm. Reproduced with permission from [81], copyright (2016) Royal Society of Chemistry.
