Radiolytic preparation of nanophase cubic cobalt metal particles

• Published in: Materials research bulletin Vol. 33; no. 10; pp. 1555 - 1562
• Main Authors: Kapoor, S., Salunke, H.G., Pande, B.M., Kulshreshtha, S.K., Mittal, J.P.
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.10.1998; Amsterdam Elsevier Science
• Subjects: A. nanostructures; Applied sciences; C. electron microscopy; C. X-ray diffraction; Chemistry; Cross-disciplinary physics: materials science; rheology; Electronics; Exact sciences and technology; General and physical chemistry; Materials science; Metals. Metallurgy; Microelectronic fabrication (materials and surfaces technology); Microelectronics: LSI, VLSI, ULSI; integrated circuit fabrication technology; Nanoscale materials and structures: fabrication and characterization; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Physics; Radiation chemistry; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; C. electron microscopy; C. X-ray diffraction; A. nanostructures; Cubic lattices; Magnetization; Ferromagnetic materials; Transition metal; Nanostructure; Experimental study; Metal particle; Cobalt; X ray diffraction; Powder; Chemical preparation; Radiolysis; TEM
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/S0025-5408(98)00136-6

Cobalt nanoparticles have been prepared by γ-radiolysis in three different forms, namely, aqueous sol, self-supporting powder, and dispersed on the surface of Al 2O 3, and characterized for their particle size distribution and metallic characteristics, using a variety of techniques. Air-stable ferromagnetic cobalt particles were found to possess the face-centered cubic structure with an average crystallite size of 5–6 nm. Magnetization studies carried out on frozen cobalt sol at 5 K also showed ferromagnetic behavior. The agglomeration of these crystallites produced particles in the range of ≅100 nm.