resumo
Here we report a generalised way to prepare transitional metal (Ni, Co, Mn, Fe) oxide nanostructures via solvothermal route followed by controlled heat treatment. The method has been successfully involved to produce structurally uniform and well crystalline phase of the different metal (Ni, Co, Mn) oxide faceted nanoparticles and porous nanorods (Fe2O3) with highly anisotropic surfaces. The product materials were characterized by the X-ray powder diffraction and electron microscope (SEM, TEM) to investigate the structural and morphological details. Optical absorption study was carried out by UV-VIS spectrophotometer and the results are analysed on the basis of their electronic transitions of 3d shell and band energies. The details magnetic investigation was carried out by the measurement of magnetization with varying magnetic field and temperature. The observed magnetic behaviour is explained on the basis of uncompensated spins lying on the surface which is extremely anisotropic in the present systems of the synthesized materials.
palavras-chave
THIN-FILMS; CRYSTALLOGRAPHIC TRANSITIONS; ELECTROCHEMICAL PROPERTIES; CO3O4 NANOCUBES; NANO-PARTICLES; NICKEL-OXIDE; NANOPARTICLES; ALPHA-FE2O3; MN2O3; SHAPE
categoria
Chemistry; Science & Technology - Other Topics; Materials Science; Physics
autores
Chakrabarty, S; De, K; Das, S; Amaral, VS; Chatterjee, K
nossos autores
Vitor Brás Sequeira Amaral
Professor Catedráticoagradecimentos
The authors gratefully acknowledge the financial support from FastTrack, Department of Science and Technology, India and SAP, University Grant Commission, India. The authors are also thankful to Professor P. V. Satyam and his scholar Mr. Ashutosh Rath, IOP, Bhubaneswar for providing the SEM and TEM facilities.