Coral-like aggregate

Ultrasonic irradiation of solutions containing volatile organometaUic compounds such as Fe(CO)j, Ni(CO), and Co(CO)3NO produced porous, coral-like aggregates of amorphous metal nanoparticles [25]. A classic example is the sonication of Fe(CO)j in decane at 0 C under Ar, which yielded a black powder. The material was >96% iron, with a small amount of residual carbon and oxygen present from the solvent and CO ligands. Bimetallic alloy particles have also been prepared in this way. Sonication of FeCCO) and Co(CO)3NO leads to Fe-Co alloy particles [26]. Nanostructured MoS can be synthesized by the sonication of Mo(CO)g with elemental sulphur in 1,2,3,5-tetramethylbenzene under Ar [27]. Metal nitrides are prepared by the sonication of metal carbonyls under a mixture ofNH3andH2atO°C [28]. 

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