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Optical properties of sol-gel prepared nano ZnO. The effects of modifier and hydrolysis agent

A. ESMAIELZADEH KANDJANI1,* , M. FARZALIPOUR TABRIZ1, N.A. AREFIAN1, M.R. VAEZI1, S. AHMADI KANDJANI2

Affiliation

  1. Materials and Energy Research Center (MERC), Karaj, Iran
  2. Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran

Abstract

Zinc oxide nanoparticles were synthesized via Sol-Gel method from zinc acetate as precursor and thriethanolamin (TEA) as modifier. The crystal structures and morphology of the nanoparticles were investigated using X-ray Diffractometer (XRD) and Transition Electron Microscope (TEM) respectively. The optical band gaps were estimated from UV-Vis spectrophotometery analysis. The results show strong dependence of the optical band gap on the synthesis conditions. The effects of Zn(Ac)2/TEA and water/ethanol ratios on properties of obtained zinc oxide nanoparticles were investigated. The band gap changes slightly with the modifier amount, while the internal strain and, thus, Urbach energy change drastically. An increase in water amount in sol-gel process decrease the crystallite size, while structural microstrain and optical properties of the samples i.e. band gap and Urbach energy, are highly dependent on ratio water/ethanol..

Keywords

ZnO; Sol-Gel; Band gap; Interior micro-strain; Urbach energy.

Submitted at: March 2, 2010
Accepted at: June 16, 2010

Citation

A. ESMAIELZADEH KANDJANI, M. FARZALIPOUR TABRIZ, N.A. AREFIAN, M.R. VAEZI, S. AHMADI KANDJANI, Optical properties of sol-gel prepared nano ZnO. The effects of modifier and hydrolysis agent, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 6, pp. 1421-1426 (2010)