We demonstrate production of nanoparticle clusters, namely clusters composed of nanoparticles, using a combination of surface-active Ag nanoparticles and surface-inactive C-60 nanoparticles. The produced clusters, after diameter-selection by a differential mobility analyzer, were analyzed by field-emission scanning electronic microscopy and X-ray photoelectron spectroscopy. The produced clusters are found to be composed of outer surface-deposited Ag nanoparticles with similar to 3 nm diameters that are distinctly isolated from one another and with an inner core composed of C-60 molecules. The number of constituent Ag nanoparticles is adjustable by selection of the diameters of the clusters. (C) 2009 Elsevier B.V. All rights reserved.