Characterization of CoFe2O4, NiFe2O4, and ZnFe2O4 nanoparticles synthesized by a proteic sol-gel method

• Autor(a) principal: Pereira, Maurício de Sousa
• Data de Publicação: 2021
• Outros Autores: Vasconcelos, Vitória Maria Rodrigues, Palacio, Milliane Passos da Silva, Oliveira, Francisco Gilvane Sampaio de, Santos, Luis Paulo Mourão dos, Vasconcelos, Daniel Linhares Militão, Freire, Paulo de Tarso Cavalcante, Vasconcelos, Igor Frota de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/67339
• topic: Spinel ferrite nanoparticles; Proteic sol-gel method; Materials caracterization; Comparative study

Nanoparticles of cobalt, nickel, and zinc spinel ferrites were successfully synthesized by a low-cost method named as proteic sol-gel method, and a comparative study was performed. Commercial metal nitrates and gelatin from bovine skin were used as precursors. Thermogravimetric analysis and differential scanning calorimetry were performed to investigate the thermal behavior of the precursor powders as well as to select the appropriate calcination temperature for oxide formation. Structural, morphological, optical, and magnetic properties were studied by X-ray diffraction, Mössbauer spectroscopy, transmission electron microscopy, vibrating sample magnetometry, Raman spectroscopy, and UV/VIS diffuse reflectance spectroscopy. Spherical nanoparticles with a single cubic spinel structure were obtained. The results indicate that the average particle sizes are less than 10 nm.CoFe 2O4 and NiFe2O4 exhibited ferrimagnetic and superparamagnetic behavior simultaneously, whereas ZnFe 2O4 was found to be paramagnetic. The optical band gaps obtained were 1.40, 1.75, and 2.12 eV for CoFe2O4, NiFe2 O 4, and ZnFe2O4 samples, respectively.