Structural, optical and electrical properties of Ni-doped Co3 O4 prepared via Sol-Gel technique

In this article, Nickel doped Cobalt oxide thin films and powders have been prepared on glass substrates using sol gel based dip coating process in order to investigate their optical, structural and electrical properties. The Ni concentration was changed from 0 to 9 wt(%).The synthesized samples wer...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 21; no. 3; p. 1
Main Authors Lakehal, Abdelhak, Bedhiaf, Benrabah, Bouaza, Amar, Benhebal, Hadj, Ammari, Abdelkader, Dalache, Cherifa
Format Journal Article
LanguageEnglish
Published Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01.01.2018
Subjects
Cobalt oxides
Electrical properties
Equivalent circuits
Fourier transforms
Glass substrates
Immersion coating
Infrared analysis
Infrared spectroscopy
Nickel
Nyquist plots
Optical properties
Scientific apparatus & instruments
Sol-gel processes
Spectrum analysis
Spinel
Thin films
X-ray diffraction
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Summary:In this article, Nickel doped Cobalt oxide thin films and powders have been prepared on glass substrates using sol gel based dip coating process in order to investigate their optical, structural and electrical properties. The Ni concentration was changed from 0 to 9 wt(%).The synthesized samples were characterised by Ultraviolete visible analysis, X-ray diffraction, Fourier transform infrared spectroscopy and Complex impedance spectroscopy to depict the optical, structural, vibrational and electrical properties. Our structural results show that the obtained samples were composed of (Co3 O4 ) polycrystalline with spinel-type preferentially oriented in the (311) plane. Our optical results show that the films have high transparency over the visible region (85% for Co3 O4 and ~ 60-75% for all doped samples). The optical band gaps were found to be (Eg1 = 1.50 eV, Eg2 = 2.20 eV) and (Eg1 = 1.42 eV, Eg2 = 2.07 eV) for the case of (pure Co3 O4 and 9% Ni-doped Co3 O4 ) respectively. The complementary phase information is provided by FT-IR spectroscopy. FT-IR spectra confirms the presence of Co2+-O and Co3+-O vibrations in the spinel lattice. The Nyquist plots suggests that the equivalent circuit of our films is an parallel circuit Rp Cp . It was found that the resistance Rp decreases whereas the capacity Cp increases with increasing doping levels.
ISSN:1516-1439
1980-5373