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Excimer Laser-Induced CVD of Carbon Encapsulated Cobalt Nanoparticles
 Fajgar, Radek ; Maryško, Miroslav ; Dřínek, Vladislav ; Kupčík, Jaroslav ; Šubrt, Jan
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.
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