Facile synthesis and characterization of ZrO2 nanoparticles prepared by the AOP/hydrothermal route

Autor(es)

Padovini, D. S. S. ^[1] ; Pontes, D. S. L. ^[1] ; Dalmaschio, C. J. ^{[2, 3]} ; Pontes, F. M. ^[1] ; Longo, E. ^{[2, 4]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Dept Chem, BR-17033360 Bauru, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem, LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[3] UFES, Dept Nat Sci, BR-29935540 Sao Mateus, Espirito Santo - Brazil

^[4] Univ Estadual Paulista, UNESP, Inst Chem, Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 4, n. 73, p. 38484-38490, 2014.
• Citações Web of Science: 18

Resumo

We report on the synthesis and characterization of ZrO2 nanoparticles prepared from zirconium(IV) butoxide in the absence of base or acid mineraliser by an advanced oxidation processes (AOP) and subsequent hydrothermal treatment which involves mixing and dissolution of the precursor for different temperatures. The structure, morphology and properties of the nanoparticles were characterized using XRD, FE-SEM, TEM, HRTEM, Raman spectroscopy, FT-IR spectroscopy, BET measurements and TGA measurements. The structural analysis by XRD and Raman spectroscopy confirms the ZrO2 specimens synthesized at 100 degrees C for 1 hour are amorphous and those treated at 150 degrees C and 200 degrees C for 1 hour were crystalline. Structural analysis by Raman spectroscopy confirms tetragonal ZrO2 specimens obtained at temperatures higher than 100 degrees C as a majority phase. From FE-SEM images, the AOP/hydrothermal route mainly produced microspheres comprised of primary nanoparticles. HRTEM images of ZrO2 microspheres, after treatment at 100 degrees C, show the beginning of crystallization, with only a few clear lattice fringes dispersed in the specimens. TEM and HRTEM images of ZrO2, after treatment at 150 degrees C and 200 degrees C indicate that the microspheres are the aggregation of small nanoparticles with a size of approximately 5-8 nm, and FFT analysis confirms the high crystallinity of the specimens. TGA analyses show a distinctive behavior for each of the ZrO2 specimens, after treatment at 100 degrees C, 150 degrees C and 200 degrees C. FT-IR analysis of ZrO2 specimens after hydrothermal treatment revealed the presence of groups, such as -OH, -CH2, and -CH at the surface. In addition, FT-IR spectra show a decrease in the amount of functional groups attached to the surface of the nanoparticles when the reaction temperature is increased. This result was also confirmed by TGA analysis. The ZrO2 specimens prepared by the AOP/hydrothermal route exhibited a high surface area of 511-184 m(2) g(-1). (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 12/14106-2 - Designe de óxidos multifuncionais com arquitetura perovskite (Pb,Sr,La, Bi) (Ti,Fe) O3
• Beneficiário: Fenelon Martinho Lima Pontes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/20536-7 - Materiais Ferroelétricos Multifuncionais: Estudos das Propriedades Ópticas, Elétricas e Fotoluminescente.
• Beneficiário: Debora da Silva Lima Pontes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado