Dendritic Ni3C1-x nanoparticles (NPs) have been synthesized through the thermolysis (230 �C) of nickel acetylacetonate using oleylamine as a reducing agent and 1-octadecene (ODE) as the solvent. Addition of trioctylphosphine (TOP) as a ligand inhibits formation of dendritic shapes and prevents incorporation of carbon, resulting in spherical Ni NPs. Similar results have been obtained using octadecane (ODA) and trioctylphosphine oxide (TOPO) as solvents, but they give less branching than ODE and produce Ni NPs at 230 �C. For incorporation of carbon from ODA or TOPO into Ni NPs, resulting in Ni3C1-x NPs, higher temperatures are required. Therefore, the vinyl group in ODE facilitates formation of Ni3C1-x NPs at lower temperatures. Conversion of dendritic Ni3C1-x NPs into NixPy NPs after adding TOP and heating to 300 �C results in the formation of multiple voids in the branches, rather than larger single voids observed for spherical NPs.

Control of branching in dendritic Ni<sub>3</sub>C<sub>1-x</sub> nanoparticles and their conversion into phosphides

246th National Meeting (2013)

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Control of branching in dendritic Ni3C1-x nanoparticles and their conversion into phosphides

Control of branching in dendritic Ni₃C_1-x nanoparticles and their conversion into phosphides