Behavior of precipitation and morphological, structural properties during the synthesis of spherical Ni and Ni0.95M0.05(M=Cu, Cr, Co, Fe) nano-particles

• Published in: Metals and materials international Vol. 21; no. 6; pp. 1074 - 1080
• Main Authors: Hong, Sun Ki, Lee, Seo-Hwan, An, Yong-Tae, Ji, Mi-Jung, Park, S. Eugene, Lee, Min-Jin, Hwang, Hae Jin, Choi, Byung-Hyun
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.11.2015; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Processes; Solid Mechanics; 재료공학; chemical synthesis; fuel cells; alloys; solution process; reduction potential
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-015-4475-x

Spherical Ni and Ni 0.95 M 0.05 (M=Cu, Cr, Co, Fe) nano-particles were synthesized using hydrazine reduction method. The objective of this study is to investigate how the different metallic species affect the reduction rate when nano-sized metallic particles are synthesized by the precipitation method. It was found that the pH and reaction temperature had significant influence over the size and morphology of the synthesized metallic nano-particles. Ni 0.95 Cu 0.05 solution showed highest reduction precipitation rate, while Ni 0.95 Cr 0.05 showed slowest rate among the metallic species investigated in this study. At higher reaction temperature, the precipitated metallic particles showed higher degree of crystallinity. The particles synthesized at higher the pH had smaller surface area because the surface of the particles became smoother. It was found that the crystallographic lattice either contract or expand depending on the substituting metallic species. It is concluded from this study that the morphology and size of the spherical Ni and Ni 0.95 M 0.05 nano-particles can be controlled by solution temperature and pH as well as metallic species added. This is due to different reaction rate resulted from difference in reduction potential and activation energy at different temperature and pH.