https://doi.org/10.1140/epjd/e2005-00146-1
Formation of carbon-encapsulated metallic nano-particles from metal acetylides by electron beam irradiation
Ways for controlled patterning of metallic lines and magnetic dot arrays
1
Institute for Molecular Science, Myodaiji Nishigonaka 38, Okazaki 444-8585, Japan
2
Institute of Material Structure Science, 1-1 Ohno, Tsukuba Ibaraki 305-0801, Japan
Corresponding author: a nishi@ims.ac.jp
Received:
6
September
2004
Published online:
13
July
2005
Transition metal acetylides, MC2 (M=Fe, Co and Ni), exhibit ferromagnetic behavior of which 
is characteristic of their size and structure.
CoC2 synthesized in anhydrous condition exhibited cubic structure with disordered C
orientation.
Once being exposed to water (or air), the particles behave ferromagnetically due to the lengthening of the Co–Co distance by the coordination of water molecules to Co2+ cations.
Heating of these particles induces segregation of metallic cores with carbon mantles.
Electron beam or 193 nm laser beam can produce nanoparticles with metallic cores covered with carbon mantles.
PACS: 36.40.-c – Atomic and molecular clusters / 36.40.Cg – Electronic and magnetic properties of clusters / 36.40.Mr – Spectroscopy and geometrical structure of clusters / 75.50.Tt – Fine-particle systems; nanocrystalline materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
