A method for producing dispersed metal particles on a substrate and the compositions
produced is disclosed. A method for producing the particles comprises exposing
an organometallic and a particulate substrate to supercritical or near supercritical
fluid under conditions to form a mixture of the fluid and the organometallic, allowing
the mixture to remain in contact with the substrate for a time sufficient to deposit
dispersed organometallic onto the substrate, venting the mixture, thereby adsorbing
the organometallic onto the substrate, and reducing the dispersed organometallic
to dispersed metal particles with a reducing agent.