Excimer Laser-Induced CVD of Carbon Encapsulated Cobalt Nanoparticles

0398915 - ÚCHP 2014 RIV CZ eng C - Conference Paper (international conference)
Fajgar, Radek - Maryško, Miroslav - Dřínek, Vladislav - Kupčík, Jaroslav - Šubrt, Jan
Excimer Laser-Induced CVD of Carbon Encapsulated Cobalt Nanoparticles.
Sborník příspěvků, pp. 126-141. Slezská Ostrava: TANGER, 2011, s. 253-258. ISBN 978-80-87294-27-7.
[ročník mezinárodní konference Nanocon 2011 /3./. Brno (CZ), 21.09.2011-23.09.2011]
Institutional research plan: CEZ:AV0Z4072921; CEZ:AV0Z4032918; CEZ:AV0Z10100521
Keywords : amorphous cobalt nanoparticles * carbon encapsulation * magnetic properties
Subject RIV: CH - Nuclear ; Quantum Chemistry; BM - Solid Matter Physics ; Magnetism (FZU-D)

Decomposition of acetylene / Co(CO)(3)(NO)mixtures induced by excimer ArF laser pulses is an efficient technique for preparation of amorphous cobalt nanoparticles encapsulated in carbon. Vacuum heating up to 900 degrees C leads to crystallization the metal core. The cobalt core crystallizes in a face-centered cubic (beta) form as revealed by X-ray and electron diffraction techniques and carbon affords graphite outer part. Properties of the Co(core) - carbon(shell)nanocomposites were examined by spectroscopy and microscopy techniques. Magnetization studies revealed paramagnetic behavior of the as-prepared amorphous deposit and superparamagnetic behavior of the annealed samples.
Permanent Link: http://hdl.handle.net/11104/0226266