期刊
CATALYSTS
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/catal12090931
关键词
NiO synthesis; spray pyrolysis; Cu-doping; nanograins; photocatalytic properties
资金
- DGRSDT-MESRS in the framework of the operating budget for PhD students [2019/2021]
- French National Agency of Research (ANR) [ANR-18-CE42-0016-02]
Pure and Cu-doped NiO films were synthesized and characterized. Cu-doping improved the structure, morphology, and photocatalytic properties of NiO films.
Pure and Cu-doped NiO films were synthesized via a soft chemical process. They were deposited on glass substrates heated to 400 degrees C. Different atomic percentage ratios (2, 4, 6, 8, and 10%) of Cu-doping were used. The prepared samples were characterized by several techniques such as X-ray diffraction for crystallographic study, SEM and AFM for microstructural and morphological properties, and UV-Visible spectroscopy for optical and photocatalytical analysis. XRD results of pure and Cu-doped NiO films indicated the formation of NiO polycrystalline phases under a cubic structure with a favored orientation along the (200) plane noticed in all sprayed films. SEM images revealed the formation of NiO nanoparticles of spherical forms whose sizes increase and agglomerate with increasing Cu-doping. At 10% Cu-doping, NiO agglomeration was extended to the whole surface. AFM images showed a textured and rough surface composed of NiO nanoparticles of average size varying from 16 to 10 nm depending on Cu-doping concentration. UV-visible spectroscopy confirmed the transparency of NiO films and their semiconducting character with a band gap ranging from 3.4450 eV to 2.8648 eV. The photocatalytical properties of pure and Cu-NiO films were enhanced by Cu-doping particles as revealed by the degradation of methylene blue (MB) solution subjected to irradiation.
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