Three-dimensional cobalt microspheres composed of nanosheets assembled via facile hydrothermal method

摘要

We report a template-free approach to prepare three-dimensional cobalt microspheres composed of nanosheets by a facile hydrothermal method. The synthesized 3D cobalt microspheres with diameter of approximately 1-2 gm have a nanosheet of ca. 18 nm. The samples were characterized by X-ray diffraction, SEM, TEM, and VSM techniques. It was found that the initial concentration of Co(NO3)(2)center dot 4H(2)O and surfactant played an important role in the formation of 3D cobalt microspheres. The Ms value of 3D cobalt microspheres which obtained under the cationic surfactant is about 122.55 emu/g. Due to the specific structure and magnetic properties, these 3D cobalt microspheres are expected to have potential applications as candidates for catalysis, sensor and energy storage. (C) 2016 Elsevier B.V. All rights reserved.