Journal
NANOSCALE
Volume 6, Issue 6, Pages 3116-3126Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr05780a
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- Deutsche Forschungsgemeinschaft (DFG)
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Microwave-induced decomposition of the transition metal amidinates {[Me(C((NPr)-Pr-i)(2))]Cu}(2) (1) and [Me(C((NPr)-Pr-i)(2))](2)Zn (2) in the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]) or in propylene carbonate (PC) gives copper and zinc nanoparticles which are stable in the absence of capping ligands (surfactants) for more than six weeks. Co-decomposition of 1 and 2 yields the intermetallic nano-brass phases beta-CuZn and gamma-Cu3Zn depending on the chosen molar ratios of the precursors. Nanoparticles were characterized by high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM), dynamic light scattering and powder X-ray diffractometry. Microstructure characterizations were complemented by STEM with spatially resolved energy-dispersive X-ray spectrometry and X-ray photoelectron spectroscopy. Synthesis in ILs yields significantly smaller nanoparticles than in PC. beta-CuZn alloy nanoparticles are precursors to catalysts for methanol synthesis from the synthesis gas H-2/CO/CO2 with a productivity of 10.7 mol(MeOH) (kg(Cu) h)(-1).
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