Abstract:Copper metal and copper(I) oxide (cuprite, cuprous oxide) nanoparticles (Cu-NPs and Cu 2 O-NPs) were prepared from different readily available copper salts by means of microwave irradiation in propylene carbonate (PC) or in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm] [BF 4 ]) without addition of extra reducing agents. The nanostructures were studied by high-angle annular dark fieldscanning transmission electron microscopy, TEM, SEM, and powder XRD. Star-shaped agglomerated Cu-NPs with about 45 nm diameter were formed from Cu(BF 4 ) 2 in PC. Cu-NPs with
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