2019-11-122019-11-122019-07-04VIEIRA, Emerson Patrick dos Santos. Estudo sistemático de nanopartículas de óxido de cobalto através da espectroscopia Raman. Orientadora: Cleidilane Sena Costa, Coorientador; Coorientador: Gabriel Adolfo Cabrera Pasca. 2019. 67 f. Trabalho de Curso (Licenciatura em Física) – Faculdade de Ciências Exatas e Tecnologia, Campus Universitário de Abaetetuba, Universidade Federal do Pará, Abaetetuba, 2019. Disponível em: https://bdm.ufpa.br/jspui/handle/prefix/2531. Acesso em:.https://bdm.ufpa.br/jspui/handle/prefix/2531Raman spectroscopy applied to the nanostructured metal oxides is quite efficient, since the active Raman modes evidenced in the spectra of these materials are directly related to the symmetry of their crystalline structure, which provides accurate information of the solids. However, in the literature there is a divergence on the positions of the peaks of the Raman spectrum referring to the phases: CoO-fcc, CoO-hcp and Co3O4. Thus, this study presents the characterization and analysis of the Raman spectra of cobalt oxide nanoparticles synthesized using the thermal decomposition method used oleylamine, bacaba oil and oleic acid in different proportions. In addition, a bulk sample of Co3O4, synthesized by the sol-gel method, was characterized as reference. Measurements Raman spectrums were performed at room temperature using the Jobin Yvon T64000 Raman spectrometer, laser power of 1.2 to 12 mW and objective lens of 20 mm. The bands were adjusted by the addition and peak decomposition method in Lorentzian functions and the displacement and the symmetry of the spectra were evaluated in relation to the Co3O4 sample. With the results, it was verified that the bulk sample had 5 Bands corresponding to the vibrational modes Eg, A1g and 3F2g predicted theoretically for Co3O4, also presented a Band indicated as contribution of CoO-fcc in the bulk scale. With this, samples synthesized with 10% with 10 washes and 5% of bacaba oil have bands at positions close to Co3O4. However, samples with 10% bacaba oil with 5 washes showed the contribution of the CoOOH and CoO-fcc phases. The samples with 10, 4 and 1% of oleic acid presented the spectrum profile similar to Co3O4, however, the Raman detachment of the Bands occurs according to the concentration of oleic acid in the solution, where two hypotheses were suggested for this effect. Moreover, the sample with 4% presented the contribution of CoO-fcc. For samples with 100% oleylamine, their bands presented values close to those of Co3O4. However, it was verified for Band 5 of higher intensity (active mode A1g) that a Lorentzian function did not compensate the experimental data. Band 5 was decomposed into three lorentzianas where the contribution of the CoO-fcc and CoO-hcp phases in their formation was confirmed. Therefore, Raman spectroscopy can evaluate the influence of the different methods used in the synthesis of bulk material and nanostructured oxides.Acesso AbertoEspectroscopia de RamanÓxido de cobaltoNanopartículasRaman spectroscopyCobalt oxidesNanoparticlesCNPQ::CIENCIAS EXATAS E DA TERRA::FISICATrabalho de Curso - Graduação - Monografia