Photocatalytical properties of NiO nanofilms doped with Ba

Boulila, S.; Ghamnia, M.; Boukhachem, A.; Ouhaibi, A.; Chakhoum, M. A.; Fauquet, C.; Heresanu, Vasile; Tonneau, D.

doi:10.1080/09500839.2020.1760389

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…[ 38 ] The hydroxyl radicals (•OH) and super‐oxide ions (O 2 − ) are highly reactive species that oxidize the organic compounds adsorbed on the surface of the catalyst and therefore converting it to non‐toxic chemical molecules. [ 39,40 ] Presented in Figure , all absorbance spectra are composed of two peaks located at 614 and 663 nm. The percentages of photocatalytic degradation were calculated using the following relation:

\begin{equation}{\rm{Photodegradation}}\;\left( \% \right) = \frac{{\left( {A - {A_0}} \right) \times 100}}{{{A_0}\;}}\end{equation}

where, A 0 is the initial absorbance of dye and A is the absorbance after UV irradiation.…”

Section: Resultsmentioning

confidence: 99%

“…[38] The hydroxyl radicals (•OH) and super-oxide ions (O 2 − ) are highly reactive species that oxidize the organic compounds adsorbed on the surface of the catalyst and therefore converting it to non-toxic chemical molecules. [39,40] Presented in Figure 4, all absorbance spectra are composed of two peaks located at 614 and 663 nm. The percentages of photocatalytic degradation were calculated using the following relation:…”

Section: Photocatalytic Activitymentioning

confidence: 99%

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Effect of Deposition Temperature on Morphological, Optical, and Photocatalytic Properties of ZnO Thin Films Synthesized by Ultrasonic Spray Pyrolysis Method

Ouhaibi

Saoula

Ghamnia

et al. 2022

Crystal Research and Technology

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ZnO thin films are synthesized by an ultrasonic spray pyrolysis method, with the deposition temperature in a range between 250–450 °C. The obtained thin films are analyzed by X‐ray diffraction (XRD), atomic force microscopy (AFM), and photoluminescence (PL). The samples are used in a photocatalytic experiment to compare the degradation efficiency by methylene blue decomposition under UV irradiation. XRD patterns confirm a polycristalline wurtzite structure with preferred orientation along the (002) plane. AFM images reveal an important change in the shape and size of the grains constituting the surface. The roughness values are in the range of 17–93 nm. Thickness values of thin films deposited at 250, 350, and 450 °C are ≈0.9, 2.3, and 1.4 µ, respectively. From PL characterization, the spectra are found to be sensitive to the deposition temperature, where emission peaks with different forms and intensities are observed. One peak at 389 nm is attributed to the recombination of free excitons, and other peaks between 403–522 nm correspond to violet, blue, and green emissions indicating the presence of Zn vacancies, Zn interstitials, and oxygen vacancies, respectively, in the ZnO structure. The photocatlytic results show that the best photocatalytic efficiency of 88% is achieved by ZnO thin film deposited at 450 °C.

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\begin{equation}{\rm{Photodegradation}}\;\left( \% \right) = \frac{{\left( {A - {A_0}} \right) \times 100}}{{{A_0}\;}}\end{equation}

where, A 0 is the initial absorbance of dye and A is the absorbance after UV irradiation.…”

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Activitymentioning

confidence: 99%

Effect of Deposition Temperature on Morphological, Optical, and Photocatalytic Properties of ZnO Thin Films Synthesized by Ultrasonic Spray Pyrolysis Method

Ouhaibi

Saoula

Ghamnia

et al. 2022

Crystal Research and Technology

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“…NiO is one of these TCO materials known for its unique physical and chemical stability, and has been the subject of many recent studies [10]. In general, pure stoichiometric NiO is an insulator but, when prepared as thin films, it is a metal-deficient p-type semiconductor with a bandgap width in the range 3.5 -4.0 eV [11,12]. The goal of this research is to synthesize thin layers of Ba-doped NiO and investigate the effect of Ba doping on the microstructural and optical properties of these layers.…”

Section: Introductionmentioning

confidence: 99%

Morphological, Structural and Optical Properties of Ba-Doped NiO Nanostructure Thin Films

Merad,

Fellah,

Diha

2023

J. Nano- Electron. Phys.

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This paper reports the effect of barium doping on NiO thin films. Undoped and doped films thin films were deposited on a glass substrate at 450 °C using pneumatic spray pyrolysis technique (PSPT) with different concentrations of barium (0 -8 at. %). X-ray diffraction patterns show the polycrystalline nature of the films with the preferred orientation (111). No other barium metal cluster and impurity phases have been observed with Ba doping. The crystal size of the deposited thin films was calculated using the Debye-Scherrer formula for the two orientations ( 111) and ( 200), and from the SEM photographs, we found values ranging from 11.95 to 39.06 nm in both cases. In the visible region, the optical transmission of Ba-doped NiO thin films dropped by up to 46 % when compared to undoped NiO thin films (79 %). The band gap was found to be decreasing in the range of 3.742 -3.503 eV with Ba doping. The Urbach disorder energy clearly increases from 262.98 to 356.64 meV when passing from the undoped thin layer to the thin layer doped at 2 at. %, then decreases to the minimum 303.14 meV for a barium doping of 8 at. %, allowing the atoms to find a good site, i.e. thin films become homogeneous and highly crystallized. The roughness was calculated using SEM image analysis. Its values were ranged between 23.26 -39.06 nm.

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“…Nowadays, with the proliferation of industries, the production of pollutant gas has increased, the discharge of wastewater, in particular by the textile industry, is increasing, and human health and nature are threatened. To face this danger, many researchers are studying the photocatalytic properties of metallic nanoparticles [24,25]. It is in this context that we synthesized the oxide CuO using spray pyrolysis, after which we studied the catalytic properties of undoped and Li-doped CuO by monitoring the evolution of the absorption intensity of the solution of methylene blue subjected to UV irradiation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Some Physical and Photocatalytic Properties of CuO Nanofilms Synthesized by a Gentle Chemical Technique

et al. 2022

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Pure and Li-doped CuO nanofilms were synthesized on heated glass substrates using the spray-pyrolysis technique. The deposited pure CuO nanofilms were achieved at a precursor molarity of 0.2 M using a solution prepared from copper nitrate trihydrate (Cu(NO3)2·3H2O). Doped Li–CuO nanofilms were obtained using several doping concentrations (3, 6, 9, 12 and 15%) by adding a solution prepared from lithium nitrate (LiNO3). The pure and Li–CuO samples were investigated by different techniques. XRD revealed three dominant peaks (-111), (111) and (211), which are the properties of monoclinic CuO. The increase in Li-doping concentration showed the appearance of other peaks of low intensities detected at 2θ ranging from 49 to 68°. AFM images showed a textured and inhomogeneous surface composed of spherical grains whose size decreased with increasing Li doping. UV–visible spectroscopy showed that the CuO samples were of low transparency; the transmittance was less than 50%. The band-gap energy determined from Tauc’s equation plot increased from 2.157 to 3.728 eV with the increase in Li doping. These values correspond well to the band gap of semiconducting CuO. The photocatalytic properties were accelerated by Li doping, as revealed by the discoloration of aqueous methylene-blue (MB) solution under ultraviolet irradiation.

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Photocatalytical properties of NiO nanofilms doped with Ba

Cited by 10 publications

References 38 publications

Effect of Deposition Temperature on Morphological, Optical, and Photocatalytic Properties of ZnO Thin Films Synthesized by Ultrasonic Spray Pyrolysis Method

Effect of Deposition Temperature on Morphological, Optical, and Photocatalytic Properties of ZnO Thin Films Synthesized by Ultrasonic Spray Pyrolysis Method

Morphological, Structural and Optical Properties of Ba-Doped NiO Nanostructure Thin Films

Characterization of Some Physical and Photocatalytic Properties of CuO Nanofilms Synthesized by a Gentle Chemical Technique

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