Structure and optical properties of ZnO produced from microwave hydrothermal hydrolysis of tris(ethylenediamine)zinc nitrate complex
Mostafa, Nasser Y.; Heiba, zein Elabidin; Ibrahim, Mohamed M.;
Abstract
ZnO powders were synthesized using a solution microwave hydrothermal hydrolysis process and tris(ethylenediamine)zinc nitrate {[Zn(en)3](NO3)2} (en = ethylenediamine) as a precursor. Hydrolysis of the precursor complex at different pH produced zinc oxide with a diversity of well-defined morphologies. The effect of hydrolysis pH values on the structural and optical properties has been explored using XRD, SEM, and UV-visible diffuse reflectance spectroscopy (DRS). At pH = 7.0, randomly dispersed rods were formed. Whereas flower-like morphologies were obtained by treating the complex precursor in water at pH = 10.0 and 12.0. The ZnO4 tetrahedrons are greatly affected by the pH value. The band gap decreased sharply with increasing the pH value from 7.0 to 10.0, then slightly decreased with further increasing the pH to 12.0. The relationship between band gap and both structure and surface defects of the samples is also discussed.
Other data
Title | Structure and optical properties of ZnO produced from microwave hydrothermal hydrolysis of tris(ethylenediamine)zinc nitrate complex | Authors | Mostafa, Nasser Y.; Heiba, zein Elabidin ; Ibrahim, Mohamed M. | Keywords | Band gap;Hydrothermal;Microwave;Optical properties | Issue Date | 5-Jan-2015 | Journal | Journal of Molecular Structure | Volume | 1079 | Start page | 480 | End page | 485 | ISSN | 00222860 | DOI | 10.1016/j.molstruc.2014.09.059 | Scopus ID | 2-s2.0-84908181387 |
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