Research

 

Influence of the precursors in the morphology, structure, vibrational order and optical gap of nanostructured ZnO

 

J.F. Jurado, A. Londoño-Calderón, F.F. Jurado-Lasso and, J.D. Romero-Salazar

 

Laboratorio de Propiedades Térmicas Dieléctricas de Compositos, Departamento de Física y Química, Universidad Nacional de Colombia, A.A 127, Manizales, Colombia, e-mail: jfjurado@unal.edu.co

 

Received 25 March 2014.
Accepted 23 May 2014.

 

Abstract

The synthesis of ZnO by reaction in solid state from two precursor salts (zinc acetate and zinc sulfate), presented significant differences concerning morphology, structure, vibrational order and optical gap. As well as covering in the size of the compounds, a homogeneous distribution of nanoparticles of 21±3 nm and microstars of 1.03±0.19 μm respectively. The ZnO showed a structural phase with a vibrational state of the hexagonal type (wurtzite). The variation in the morphology due to the precursor is attributed to the disorder within of lattice, which contributes to vibrational changes and is correlated to the degrees of freedom of molecules. Measurements of UV-Vis of nanoparticles displayed a band gap (E_g) lower than the one reported for the bulk material.

Keywords: Optical properties; nanorods; nanocrystalline; X-ray diffraction.

 

PACS: 78.67.Bf; 78.67.Qa; 78.67.Bf; 61.05.cp

 

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Acknowledgments

This work was supported by the Research Direction of Manizales DIMA from National University of Colombia-Project number 15875. The authors wish to thank to: Plasma physics, Material optical properties and Chemistry laboratories for the XRD, Raman and UV-Vis measurements. As well as the University of Texas, at Antonio and Kleberg Advanced Microscopy Laboratory where the SEM measurements were carried out.

 

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