Effect of annealing temperature and pH on morphology and optical property of highly dispersible ZnO nanoparticles

Journal Article · Sun Nov 15 04:00:00 EST 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.06.002· OSTI ID:22066141

Uthirakumar, Periyayya ^[1]; Hong, Chang-Hee ^[1]

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1. 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, Journal Name: Materials Characterization Journal Issue: 11 Vol. 60; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
AMMONIUM HYDROXIDES
ANNEALING
EMISSION SPECTRA
MONOCRYSTALS
MORPHOLOGY
NANOSTRUCTURES
OPTICAL PROPERTIES
PARTICLE SIZE
PARTICLES
PH VALUE
PHOTOLUMINESCENCE
TEMPERATURE DEPENDENCE
ULTRAVIOLET SPECTRA
X-RAY DIFFRACTION
ZINC OXIDES