Gold and platinum nanoparticles were prepared using a reverse micelle technique, creating products withseveral particle sizes. The stabilized metal nanoparticles can be deposited over long-range distances formingordered arrays using supercritical carbon dioxide to remove the colloid solvent. The use of supercritical carbondioxide creates uniformly deposited particle layers and can be removed without disturbing the precipitatedparticles. We also show that these nanoparticles can be deposited efficiently in nanometer trenches, which isnot possible using conventional particle deposition by liquid evaporation.