Magnetic and optical properties of electrodeposited nanospherical copper doped nickel oxide thin films

Ijeh, Rufus O.; Nwanya, Assumpta C.; Nkele, Agnes C.; Madiba, I.G.; Khumalo, Z.M.; Bashir, A.K.H.; Osuji, R. U.; Mâaza, M.; Ezema, Fabian I.

doi:10.1016/j.physe.2019.05.013

Cited by 28 publications

(7 citation statements)

References 35 publications

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“…After calcination, hydrotalcites collapse and form mixed oxides of MgO and NiO phases (PDF# 00‐047‐1049). Peaks of periclase and spinel phases were observed but corresponded to unbound cubic NiO‐like nanocrystals [14,41,42] . The nanospheroidal oxides display a narrow cubic distribution of NiO, as shown by diffractions in Figure 2; this distribution persists for mixed oxides derived from ion exchange and MgAl reconstruction with different intensities (Figure 2, red line).…”

Section: Resultsmentioning

confidence: 95%

Enhancing Catalytic Performance with Sol‐Gel Hydrotalcite‐Derived Nickel Oxide Catalysts for Dry Reforming of Methane: An Examination on Reactivity and Coke Formation

Gonzalez Caranton,

Stavale,

Annese

et al. 2023

ChemCatChem

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Hydrotalcite‐based materials are preferred as catalysts due to their versatility and easiness of their synthesis. This work studies supported nickel catalysts made from hydrotalcites through sol‐gel synthesis, Ni‐EDTA impregnation, and coprecipitation. The synthetized hydrotalcites present nanocapsular morphology and dispersed nickel nano‐oxide particles after calcination at 500 °C. The catalysts were evaluated at 600 °C and 800 °C for 8 hours and demonstrated high conversions and varying yields, with sol‐gel oxide catalysts (SgOxMix) showing the best performance with the highest reactivity and controlled coke formation at 800 °C after 14 hours of testing. The mixed oxide morphology promotes electronic effects and inhibits carbon encapsulation of metallic particles. Principal component analysis was performed to explain fluctuations in the reaction pathway.

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Section: Resultsmentioning

confidence: 95%

Enhancing Catalytic Performance with Sol‐Gel Hydrotalcite‐Derived Nickel Oxide Catalysts for Dry Reforming of Methane: An Examination on Reactivity and Coke Formation

Gonzalez Caranton,

Stavale,

Annese

et al. 2023

ChemCatChem

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“…The reflectance (R) of the deposited films was calculated using the law of conservation of radiant energy relating to absorbance, transmittance and reflectance as shown in equation (3) according to [22][23][24].…”

Section: Nanoarchitectonicsmentioning

confidence: 99%

Influence of Annealing Temperature on the Properties of SILAR Deposited CdSe/ZnSe Superlattice Thin Films for Optoelectronic Applications

et al. 2022

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In this work, superlattice thin films of CdSe/ZnSe were fabricated on a non-conductive glass substrate using the successive ionic layer adsorption reaction (SILAR) method to investigate their properties for possible optoelectronic applications. The SILAR process involved a total cycle time of 100 seconds for a complete SILAR cycle with a total of 12 cycles made by depositing alternative layers of CdSe and ZnSe. The deposited thin films were annealed at different temperatures and characterized to determine their optical, elemental, morphological and structural properties using UV-VIS spectroscopy, Scanning electron microscope (SEM)/energy dispersive x-ray spectroscope (EDS) and x-ray diffraction techniques (XRD). The results of the characterizations revealed that optical properties of the films such as absorbance, reflectance, refractive index and extinction coefficient are low but increased as the annealing temperature increases. The bandgap energy was found to decrease from 2.50 eV-1.90 eV for as-deposited film and those annealed between 373 K and 523 K. film thickness was found to range from 130.169 nm to 254.441 nm. The EDS results showed that the target elements such as Cd, Zn, Se and other elements traceable to the nature of substrate used were found to be present in the deposited thin film samples. The results of the XRD showed that the thin films are polycrystalline and the diffraction peaks are influenced by annealing of the sample at a higher temperature such as 523 K. The crystal parameters such as crystallite size, dislocation density and micro-strain of the film at 523 K were found to be 5.546 nm, 3.25 × 1016 l/m2 and 1.13 × 10-2. The SEM results showed that the CdSe/ZnSe superlattice films were composed of tiny nanoparticles of different dimensions and sizes with hollow which increased as the annealing temperature increased from 432 K to 523 K. Possible applications of the deposited superlattice thin films in solar cells and optoelectronic devices were established by virtue of their bandgap energy and other properties.

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“…This gives strong evidence that the band edge absorption of WO 3 NCs is located around 450 nm, which is at visible light region. The band gap of the synthesized WO 3 NCs could be calculated based on UV-vis diffuse reflectance result using Tauc's equation (Ijeha et al 2019) that given by:…”

Section: Optical Propertiesmentioning

confidence: 99%

Synthesis, characterization and ab initio study of WO3 nanocubes with peculiar electrochemical properties

et al. 2021

Self Cite

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A non-energy intense route was used for the synthesis of highly crystalline WO 3 nanocubes. The morphological studies confirmed the cuboidal shape of the nanocrystals. Raman spectrum result for the synthesized sample revealed that the vibrational modes correspond to those ones assigned to single phase stoichiometric WO 3 . The band gap Eg was derived based on UV-Vis diffuse reflectance result and found to be 2.58 eV, whereas the photoluminescence (PL) result confirmed the blue emission for the synthesized sample. The structural and electronic properties of the orthorhombic WO 3 were studied within the spin-polarized density functional theory (SDFT) using various functionals. Results indicated that the orthorhombic WO 3 is non-magnetic and has a direct band gap in the range of 2.15-3.75 eV which depends on the exchange-correlation functional used in the theory. The electrochemical studies showed that the nanocubes exhibited a peculiar electrochemical behaviour. In fact, the charge transfer resistances relatively enhanced which may results in decreasing the capacitance of the highly crystalline WO 3 nanocubes.

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Magnetic and optical properties of electrodeposited nanospherical copper doped nickel oxide thin films

Cited by 28 publications

References 35 publications

Enhancing Catalytic Performance with Sol‐Gel Hydrotalcite‐Derived Nickel Oxide Catalysts for Dry Reforming of Methane: An Examination on Reactivity and Coke Formation

Enhancing Catalytic Performance with Sol‐Gel Hydrotalcite‐Derived Nickel Oxide Catalysts for Dry Reforming of Methane: An Examination on Reactivity and Coke Formation

Influence of Annealing Temperature on the Properties of SILAR Deposited CdSe/ZnSe Superlattice Thin Films for Optoelectronic Applications

Synthesis, characterization and ab initio study of WO3 nanocubes with peculiar electrochemical properties

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