Premium
Synthesis and Characterization of Metallic Co with Different Hierarchical Structures Prepared by a Simple Solvothermal Method
Author(s) -
Duan Lianfeng,
Jia Shusheng,
Zhao Lijun
Publication year - 2010
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200901105
Subject(s) - chemistry , crystallite , cobalt , morphology (biology) , metal , crystallography , crystal structure , nanotechnology , hexagonal crystal system , spheres , solvothermal synthesis , crystal (programming language) , characterization (materials science) , chemical engineering , materials science , inorganic chemistry , organic chemistry , genetics , physics , engineering , astronomy , computer science , programming language , biology
Magnetic metallic cobalt with different hierarchical structures, such as dendritic particles, flowery particles, and flocky spheres, has been successfully prepared by using a simple solvothermal process in which the relative amounts of H 2 C 2 O 4 and N 2 H 4 · H 2 O in the reaction system were rationally adjusted. The Co crystals with hierarchical structure had a hexagonal‐close‐packed (hcp) structure. The dendritic Co crystal comprises several 1–5 μm long dendrites, and thehierarchical assemblies radiate from the center. The flowerlike Co submicrocrystals are composed of petal‐like crystals around 1.5 μm in diameter and 100–200 nm thick. Interestingly, an intergrade from single‐crystal to polycrystalline structures for flowerlike Co submicrocrystals is observed. The flocky spheres, about 600 nm in diameter, consist of 5 nm thick nanosheets. In addition, a growth mechanism is proposed which is based on the evolution of the structure and morphology with increasing reaction time. Further magnetic measurements for the Co crystals with different hierarchical structures indicated that the morphology of the Co crystals had an obvious influence on their magnetic properties.