Synthesis of nickel/gallium nanoalloys using a dual-source approach in 
1-alkyl-3-methylimidazole ionic liquids

Simon, Ilka; Hornung, Julius; Barthel, Juri; Thomas, Jörg; Finze, Maik; Fischer, Roland A.; Janiak, Christoph

doi:10.3762/bjnano.10.171

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Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids

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Thomas, Jörg
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Simon, I., Hornung, J., Barthel, J., Thomas, J., Finze, M., Fischer, R. A., et al. (2019). Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids. Beilstein Journal of Nanotechnology, 10, 1754-1767. doi:10.3762/bjnano.10.171.

Cite as: https://hdl.handle.net/21.11116/0000-0009-7394-E

Abstract

NiGa is a catalyst for the semihydrogenation of alkynes. Here we show the influence of different dispersion times before microwave- induced decomposition of the precursors on the phase purity, as well as the influence of the time of microwave-induced decomposition on the crystallinity of the NiGa nanoparticles. Microwave-induced co-decomposition of all-hydrocarbon precursors [Ni(COD)2] (COD = 1,5-cyclooctadiene) and GaCp* (Cp* = pentamethylcyclopentadienyl) in the ionic liquid [BMIm][NTf2] selectively yields small intermetallic Ni/Ga nanocrystals of 5 ± 1 nm as derived from transmission electron microscopy (TEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and supported by energy-dispersive X-ray spectrometry (EDX), selected-area energy diffraction (SAED) and X-ray photoelectron spectroscopy (XPS). NiGa@[BMIm][NTf2] catalyze the semihydrogenation of 4-octyne to 4-octene with 100 selectivity towards (E)-4-octene over five runs, but with poor conversion values. IL-free, precipitated NiGa nanoparticles achieve conversion values of over 90 and selectivity of 100 towards alkene over three runs. © 2019 Simon et al.