Abstract
Ruthenium nanoparticles have been synthesized by a novel pulsed-flow supercritical method using ethanol both as solvent and reducing agent. To improve the understanding of the formation and growth of Ru nanoparticles, the synthesis processes were also studied by in situ synchrotron radiation powder X-ray diffraction (SR-PXRD). Both the face-centered cubic (fcc) structure and the hexagonal close packed (hcp) structure of Ru can be synthesized in phase pure form by controlling the reaction conditions. When Ru(acac)3 is used as the precursor, fcc Ru is formed at a reaction temperature of 200 °C, while the hcp structure appears at higher temperatures. For syntheses with RuCl3 as the precursor, pure hcp Ru forms at all temperatures investigated, but an intermediate, yet unidentified, compound is detected in the reaction process at 200 °C. Both the pulsed-flow experiments and the in situ SR-PXRD experiments show that the reduction of the RuCl3 precursor proceeds faster than the reduction of the Ru(acac)3 precur...
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