Abstract
A series of undoped nanocrystalline ZnO particles were successfully synthesized at various dry temperatures (100?C - 600?C) using coprecipitation method. The samples were characterized using a variety of experimental methods such as x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX), thermal analysis TG-DTA, UV-vis spectroscopy, infrared absorption spectroscopy (FTIR) and electron spin resonance spectroscopy (ESR). According to XRD analysis, all of our ZnO samples posses the hexagonal wurzite structure with average crystallite size increased ranging from 19 - 23 nm as dry temperature increased. Optical absorption spectra show that the band gap shifted to the lower energy with increasing crystallite size. ESR measurements showed the resonance of electron centers with the g values of about 1.96. With increasing dry temperature we observed the decrease of the g values and the increase of the intensities of the ESR signal. In addition an increase in dry temperature results in a pronounce decrease of OH local vibrational modes. The results from ESR measurements are well supported by the results obtained from Infrared absorption spectroscopy and thermal analysis measurements.
Highlights
The interest of research in semiconductor ZnO has started in 1935 [1], it was first in 1950s did it gain more credence mainly due to its optical properties [2]
The samples were characterized using a variety of experimental methods such as x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX), thermal analysis TG-DTA, UV-vis spectroscopy, infrared absorption spectroscopy (FTIR) and electron spin resonance spectroscopy (ESR)
In this article we report the synthesis of nanocrystalline ZnO particles obtained using coprecipitation method at various dry temperature and characterize the structural, optical properties, vibrational modes and magnetic resonance of these nanoparticles
Summary
The interest of research in semiconductor ZnO has started in 1935 [1], it was first in 1950s did it gain more credence mainly due to its optical properties [2]. Van de Walle [5] in his firstprinciples investigation, based on density functional theory suggested that the presence of hydrogen atom in ZnO can act as a shallow donor This behavior is unexpected and very different from hydrogen’s role in other semiconductors, in which it acts only as a compensating center counteracting the prevailing conductivity. In this article we report the synthesis of nanocrystalline ZnO particles obtained using coprecipitation method at various dry temperature and characterize the structural, optical properties, vibrational modes and magnetic resonance of these nanoparticles. Structure is characterized using x-ray diffraction (XRD), optical properties and vibrational modes are studied by UV-vis and infrared absorption spectroscopy, while magnetic resonance are deployed using electron spin resonance (ESR) spectroscopy. Our results are compared with those published in the literatures
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