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TEM overview image of different Au-NiS core–shell nanoparticle samples (A–D). It can be seen that the synthesis works using different core sizes and also that it is possible to tune the thickness of the α-NiS shell around the same Au cores (C and D). (E) XRD pattern of the sample depicted in part A. Reflections of the large gold cores can be observed as well as reflections that are attributed to the nickel sulfide shell.
