Catalytic metal nanoparticles with controlled size, shape, composition, and surface structure are important from both a fundamental and a technological viewpoint, due to their ability to offer high selectivity. However, there exists a major challenge in the ability to develop synthetic approaches that provide control over the size, shape, and dispersity of ruthenium nanoparticles. The presentation will demonstrate a new one-step synthetic procedure for monodisperse, well-shaped ruthenium nanoparticles in the size range of 2-50 nm prepared at temperatures of 90-140 ^oC. We have investigated the effects of various stabilizing ligands including thioethers and trialkylamines. Careful control of the reaction conditions, stabilizing ligands, and ratio of metal salt to stabilizing ligand led to well-defined monodisperse nanoparticles. Characterization by transmission electron microscopy, x-ray diffraction, electrochemistry and energy dispersion x-ray analysis confirmed the composition of the nanoparticles. Strategies for immobilization of these nanoparticles onto solid supports for potential catalytic applications will also be presented.