Nanoparticles with high surface area deposited on different substrates are currently used extensively as catalysts for chemical transformations. Numerous experiments demonstrate that metallic nanoparticles can directly be deposited on various solid substrates by supercritical fluid reactive deposition. This technique involves the dissolution of the organometallic precursor in a supercritical fluid and the exposure of a substrate to this solution. In general, different methods such as chemical or thermal reduction under different pressures can be used to convert the precursor to its metal form. Results of these experiments show that uniform metallic nanoparticles in the range of 2 nm can be produced. Average particle size and size distribution can be affected by the precursor reduction method, type and amount of the precursor, the surface properties of the solid substrate such as surface area and chemical nature of the surface. Metal loading depends on the metal content of the precursor and its concentration in CO2. (C) 2014 Elsevier B.V. All rights reserved.