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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Padovini, D. S. S. [1] ; Pontes, D. S. L. [1] ; Dalmaschio, C. J. [2, 3] ; Pontes, F. M. [1] ; Longo, E. [2, 4]
Total Authors: 5
[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
Total Affiliations: 4
Document type: Journal article
Source: RSC ADVANCES; v. 4, n. 73, p. 38484-38490, 2014.
Web of Science Citations: 17

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)

FAPESP's process: 11/20536-7 - Multifunctional ferroelectric materials: studies of optical, electrical and photoluminescent properties
Grantee:Debora da Silva Lima Pontes
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/14106-2 - Designe multifunctional oxides with perovskite architecture (Pb, Sr, La, BI) (Ti, Fe) O3
Grantee:Fenelon Martinho Lima Pontes
Support type: Regular Research Grants