Properties of nickel oxide nanopowders prepared by electrical explosion of a wire

摘要

The properties of NiO nanopowders prepared by electrical explosion of a wire in an oxygen-containing atmosphere are presented. Most of the NiO nanopowders are found to be oxygen-enriched, the excess of oxygen depending mainly on the nickel vapor concentration. The dependences of the powder particle size on the oxygen concentration and overheating of the exploding metal are discussed. The powder nanoparticles are both single-crystal and polycrystalline with a rhombohedral lattice and have different shapes (from cubic to spherical). There typical sizes range from 15 to 50 nm, depending on the explosion conditions. (c) 2005 Pleiades Publishing, Inc.