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Preparation of gold nanoclusters with high coordination numbers. a) Density gradient separation to obtain a specific population from the initial mixture of clusters. b) SEM micrographs of the different cluster populations obtained after careful fractionation of the corresponding stripes in image (a) by using a piercing unit. c) Representative HR-TEM images of particle dimers and trimers illustrating the small interparticle gaps and cavities generated by this fabrication method.
