Optical and structural characteristics of ZnO nanopowders for different preparation methods Optical and structural characteristics of ZnO nanopowders for different preparation methods

Optical and structural characteristics of ZnO nanopowders for different preparation methods

Glécia V. S. Luz1, 2*, Emerson R. Santos1, Leandro X. Cardoso2, Lourdes M. Brasil2, Pilar Hidalgo2*, Wang S. Hui1

1Departamento de Metalurgia e Materiais, Escola Politécnica da USP, Universidade de São Paulo-USP, Av. Prof. Mello Moraes 2463, São Paulo-SP, 05508-030, Brazil

2UnB Gama-FGA, Universidade de Brasília-UnB, Área Especial de Indústria Projeção A, Brasília-DF, 72444-240, Brazil

Adv. Mater. Lett., 2017, 8 (12), pp 1193-1198

DOI: 10.5185/amlett.2017.1581

Publication Date (Web): Sep 08, 2017

E-mail: gleciavs@gmail.com, drapilar@gmail.com

Abstract


Zinc oxide (ZnO) nanoparticles (NPs) were synthesized by different methods known as Pechini and Sol-Gel. It was observed during the experiments significant differences comparing these methods as: particle size, time applied, crystallinity and chemical residues generated by-products. The NPs were analysed by X-ray diffraction (XRD), ultraviolet-visible (UV-Vis.) absorption and Raman spectroscopy techniques. X-Ray Difractograms showed peaks corresponding to hexagonal wurtzite crystalline structure. It was observed that NPs obtained by the Pechini showed better homogeneity and crystallinity; these presented average size of 115 nm. The NPs produced by Sol-Gel method showed crystallites with smaller average size of 8 nm. The band gap energy (Eg) obtained using UV-Vis for ZnO NPs synthesized by Pechini was 3.39 eV. Still, the results for Sol-Gel method with 5 and 10 hours of reactions were 3.53 eV and 3.55 eV respectively. Raman data obtained by Pechini and Sol-Gel Methods showed characteristics peaks. The obtained data confirmed the ZnO phase samples and the proportional relationship to the enlargement with the intensity of peaks E2 High ˜ 438 cm-1, as evidenced by literature. These results lead to the applicability of both NPs in optoelectronic and fluorescent applications. 

Keywords

ZnO, nanoparticles, pechini method, sol-gel method.

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