Effect of annealing temperature and pH on morphology and optical property of highly dispersible ZnO nanoparticles
- School of Semiconductor and Chemical Technology, Semiconductor Physics Research Center, Chonbuk National University, Chonju 561-756 (Korea, Republic of)
Highly dispersible zinc oxide nanoparticles were produced in large quantity via a simple solution method. The effect of temperature and pH impact on as-prepared ZnO nanoparticles with respect to the morphological and optical characteristics has been investigated. The average particle size of ZnO nanoparticles increased with increasing annealing temperature. A sharp UV band-edge emission was observed in as-prepared ZnO nanoparticles with negligibly less intense deep level emission. However, upon annealing at high temperature in air, UV band-edge emission disappears with an evolution of a broad deep level emission in photoluminescence spectra. Similarly, by adjusting the pH of reaction medium from 4 to pH = 8 using ammonium hydroxide solution, particle size gets bigger and bigger leads to red-shift in UV band-edge emission and an appearance of deep level emission peak. At pH = 8, well resolved sharp X-ray diffraction peaks were observed with lower FWHM values due to higher crystallite sizes.
- OSTI ID:
- 22066141
- Journal Information:
- Materials Characterization, Vol. 60, Issue 11; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
Similar Records
Near band edge emission characteristics of sputtered nano-crystalline ZnO films
Synthesis and characterization of porous ZnO nanoparticles by hydrothermal treatment of as pure aqueous precursor