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  1. bookVolume 63 (2021): Issue 1 (December 2021)
Annals of West University of Timisoara - Physics's Cover Image
Annals of West University of Timisoara - Physics
Journal Details
License
Format
Journal
eISSN
2784-1057
First Published
15 Dec 2012
Publication timeframe
1 time per year
Languages
English
access type Open Access

Study of the Structural, Optical, Electrical and Morphological Properties of Nickel Sulfide Thin Films Used in Supercapacitors

Abdelouahab Gahtar,
Abdelouahab Gahtar,
Said Benramache,
Said Benramache,
Abdelkader Ammari and
Abdelkader Ammari and
Abdelwaheb Boukhachem
Abdelwaheb Boukhachem
Published Online: 22 Dec 2021
Volume & Issue: Volume 63 (2021) - Issue 1 (December 2021)
Page range: 1 - 13
Received: 09 Nov 2020
Accepted: 27 Jan 2021
Annals of West University of Timisoara - Physics's Cover Image
Annals of West University of Timisoara - Physics
Journal Details
License
Format
Journal
eISSN
2784-1057
First Published
15 Dec 2012
Publication timeframe
1 time per year
Languages
English
Abstract

Nickel sulfide (NiS) thin film has been deposited on glass substrates by spray-pyrolysis at 325 ± 5 °C. The precursor aqueous solution was synthetized using hexahydrated nickel nitrates and thiourea. The structural, morphological, optical and electrical properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible spectroscopy and four probes electrical measurements. The XRD analysis confirmed the hexagonal structure of NiS thin film, which was found to crystalize along [010] direction with an average crystallites size of 10.5 nm. The lattice parameters are a = b = 3.420 Å and c = 5.300 Å in the space group P63/mmc. The optical properties of the films were investigated through the transmittance and the reflectance measurements. The results revealed that the material exhibits a direct optical band gap of 1.03 eV. The elementary composition analysis confirmed the presence of Ni and S with a stoichiometry ratio (Ni/S) of 1.05. The morphology analysis revealed a homogenous crack-free, compact appearance and a granular surface in all scanned areas. The average roughness of the surface was 6.48 nm. On the other hand, the film exhibits a high electrical conductivity ca. 1.10 × 105 S/cm at room temperature. The above results show that the prepared NiS in this study has a good crystallization, dense morphology, good stoichiometric ratio and high conductivity; therefore, it stands as a potential candidate for application in supercapacitors as an electrode material.

Keywords

  • NiS
  • spray-pyrolysis
  • thin films
  • optical gap
  • conductivity

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