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Optical properties of Sol-Gel prepared nano ZnO. The effects of aging period and synthesis temperature

A. ESMAIELZADEH KANDJANI1,* , A. SHOKUHFAR1, M. FARZALIPOUR TABRIZ2, N. A. AREFIAN2, M. R. VAEZI2

Affiliation

  1. Department of Material Science and Engineering, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
  2. Materials and Energy Research Center (MERC), Karaj, Iran

Abstract

In present work zinc Oxide (ZnO) nanoparticles were synthesized via Sol-Gel method in different temperatures and aging periods. The structures and morphologies of obtained nanoparticles were investigated via X-ray Diffractometer (XRD) and Transition Electron Microscope (TEM), respectively. The optical band gaps were estimated from Uv-Vis analyses. The results show high dependence of optical band gap to the synthesis conditions. The effects of these parameters on the band gap were investigated based on produced internal microstrains in the obtained zinc oxide structure. The band gap increase drastically with increase in synthesis duration. By decrease in sol-gel temperature the band gap shows a slight decrease..

Keywords

ZnO, Sol-Gel, Band gap, internal microstrain, Urbach energy.

Submitted at: Aug. 16, 2008
Accepted at: March 24, 2009

Citation

A. ESMAIELZADEH KANDJANI, A. SHOKUHFAR, M. FARZALIPOUR TABRIZ, N. A. AREFIAN, M. R. VAEZI, Optical properties of Sol-Gel prepared nano ZnO. The effects of aging period and synthesis temperature, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 3, pp. 289-295 (2009)