Synthesis, growth mechanism and photocatalytic properties of nickel oxide (NiO) nanoflower: a hydrothermal process

Jeba, S. Virgin; Sebastiammal, S.; Sonia, S.; Fathima, A. Lesly

doi:10.1080/24701556.2020.1837163

Cited by 6 publications

(7 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 These cause the first-order phonon scattering in NiO thin film. Further, these defects collectively enhance the Raman intensity [7,32,33]. Also, the peak observed around 967 cm −1 is assigned to two phonons scattering TO+LO mode, it may be attributed to the surface oxygen vacancy and the second-order phonon scattering is due to the vibrations of Ni-O band, 2LO mode is observed at 1100 cm −1 [32].…”

Section: Raman Studiesmentioning

confidence: 90%

“…Raman spectroscopy measurements were performed at room temperature on pristine, and RE-doped NiO films to confirm the lattice disorder, cationic distribution via molecular vibrations [32,33]. Raman spectroscopy is a versatile technique, which can detect a low percentage of doping (less than 5%), however, less than 1% of doping does not affect on the vibrational modes of the host crystal [7,34].…”

Section: Raman Studiesmentioning

confidence: 99%

“…Further, these defects collectively enhance the Raman intensity [7,32,33]. Also, the peak observed around 967 cm −1 is assigned to two phonons scattering TO+LO mode, it may be attributed to the surface oxygen vacancy and the second-order phonon scattering is due to the vibrations of Ni-O band, 2LO mode is observed at 1100 cm −1 [32]. There is no signature of antiferromagnetic nature because no magnon-related peaks were observed in our samples at room temperature [32].…”

Section: Raman Studiesmentioning

confidence: 99%

See 2 more Smart Citations

The effect of rare-earth element (Gd, Nd, La) doping of NiO films on UV photodetector

et al. 2022

View full text Add to dashboard Cite

The semiconductor-based UV photodetectors are the most essential devices in the field of space observations, military, DNA sequencing, analysis of protein, medical imaging, checking of atmospheric pollution, optical communications radiation, etc. With such a wide range of possible applications, the nanostructured pristine and rare-earth (RE) doped NiO ((NiO: Gd(1%), NiO:Nd(1%), NiO:La(1%)) thin films were prepared and investigated for their suitability as UV photodetectors. The films were prepared by nebulized spray pyrolysis (NSP) at a substrate temperature of 450 °C. The X-ray diffraction studies confirm the cubic single phase with the polycrystalline nature of the prepared films. The spectroscopic studies such as absorbance and photoluminescence confirm that increase in the optical bandgap and 391 nm PL emission is attributed to the near band edge emission of the NiO. The X-ray photoelectron spectroscopy reveals the presence of nickel and the doped elements with their oxidation states. The UV photodetector performance of the prepared NiO films was carried out under the irradiation of 365 nm light. The NiO:Gd exhibits the best responsivity (0.353 AW-1), external quantum efficiency (120 %), detectivity (1.72×1010 Jones) and rise time (2.0 s), and fall time (2.2 s). Importantly, strategies such as limited doping (1 at.%) and larger ionic radii of Gd incorporation into the host NiO cause a moderate increase in the lattice distortion and inhibit the recombination rate instead of behaving as a recombination center. In addition, the conduction band (CB) electrons are trapped by a greater number of oxygen vacancies residing at the Gd3+ 4f state and cause a good separation of charge carriers. Overall, these modifications enhance the mean lifetime of electrons, consequently reducing the recombination rate and enhancing the photoresponse.

show abstract

Section: Raman Studiesmentioning

confidence: 90%

Section: Raman Studiesmentioning

confidence: 99%

Section: Raman Studiesmentioning

confidence: 99%

See 1 more Smart Citation

The effect of rare-earth element (Gd, Nd, La) doping of NiO films on UV photodetector

et al. 2022

View full text Add to dashboard Cite

show abstract

“…89‐4897) [29,30] . The inclusion of NiO nanoflower in Pd/B resulted in the appearance of the new planes (100, 110, 311, and 211) and there is a decrease in the peak intensity at ~2Ɵ: 8°, 18°, 68°, and 82° [31] . This shows that the surface of the PdNiONF/B has changed, and those changes influence the intensity and position of diffraction peaks in the XRD pattern.…”

Section: Resultsmentioning

confidence: 94%

“…These findings support the conclusions obtained using the CV approach. [31] Cyclic voltammetry of PdNiONF/B catalyst in 2 M NaOH was run at different potential windows (À 1.2-0.5 V and À 1.0-0.3 V), Figure 3 of À 1.2 to 0.5 V, the current of Pd/C, Pd/B, and PdNiONF/B in a 2 M NaOH solution decreases. However, these materials exhibit higher currents within the range of À 1 to 0.3 V. The selection of potential windows aims to encompass the entire redox wave while maintaining a narrow range to prevent unwanted side reactions or interference from other species.…”

Section: Determining the Ideal Parameters For Electro-oxidationmentioning

confidence: 99%

PdNiONF−Borophene Nanocomposite as a Promising Catalyst for Ethanol Electro‐Oxidation Reaction

Mabhulusa,

Sekhosana,

Fuku

2024

ChemElectroChem

View full text Add to dashboard Cite

An electrocatalyst decorated with nickel oxide nanoflower and borophene (PdNiONF/B) has been presented as a possible catalyst for the ethanol oxidation reaction (EOR) in alkaline media. The crystal microstructure, composition, and morphology of the product were analyzed by using X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Energy‐dispersive X‐ray spectroscopy (EDS). The catalytic activity of the PdNiONF/B for ethanol electrooxidation was assessed by using electrochemical impedance spectroscopy, cyclic voltammetry, and chronoamperometry. PdNiONF/B shows a high current at 0.12 mA as compared to palladium on carbon (Pd/C) and palladium on borophene (Pd/B) in 2 M of NaOH+ 2 M of EtOH. In addition, PdNiONF/B is stable and more tolerant of impurities. This observation suggests that PdNiONF/B possesses a better catalytic behavior. The ratio of the backward peak current (Ibwd) to the forward peak current (Ifwd) (Ibwd/Ifwd) in a 2 M of NaOH+2 M of EtOH is equal to (Ibwd/Ifwd) 1.0 V vs. Ag|AgCl for PdNiONF/B catalyst. This ratio indicates that PdNiONF/B has an excellent tolerance to ethanol intermediate species poisoning.

show abstract

Examining the impact of nano‐sized Litharge, Tenorite, and Hematite on the thermal decomposition of ammonium perchlorate‐based cross‐linked composite modified double base propellant

Fertassi,

Belkhiri,

Touidjine

et al. 2024

Propellants Explo Pyrotec

View full text Add to dashboard Cite

This study aims to compare the catalytic effects of three nano‐metal oxides (nMOs); Litharge (α‐PbO), Tenorite (CuO), and Hematite (α‐Fe2O3) on the thermal decomposition of an ammonium perchlorate based cross‐linked composite modified double base propellant (AP‐XLCMDBP). The three nMOs are synthesized via a chemical precipitation method and then characterized using XRD, FTIR, and SEM. Their effect on the thermal decomposition of AP‐XLCMDBP is studied using thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC). The results indicate that Litharge has no significant effect on the thermal decomposition of AP‐XLCMDBP. However, both Tenorite and Hematite nanocatalysts accelerate the thermolysis process and enhance the total heat released from AP‐XLCMDBP. Moreover, compared to Tenorite, Hematite nanoparticles are found to be a more efficient catalyst, where their presence in AP‐XLCMDBP leads to a significant decrease in activation energies of the first and the second decomposition stages by 13.67 kJ/mol and 17.57 kJ/mol, respectively. An increase of the total decomposition heat by 153.73 J/g is also attained in the presence of Hematite, displaying its high catalytic action on the thermal decomposition of AP‐XLCMDBP.

show abstract

Synthesis, growth mechanism and photocatalytic properties of nickel oxide (NiO) nanoflower: a hydrothermal process

Cited by 6 publications

References 67 publications

The effect of rare-earth element (Gd, Nd, La) doping of NiO films on UV photodetector

The effect of rare-earth element (Gd, Nd, La) doping of NiO films on UV photodetector

PdNiONF−Borophene Nanocomposite as a Promising Catalyst for Ethanol Electro‐Oxidation Reaction

Examining the impact of nano‐sized Litharge, Tenorite, and Hematite on the thermal decomposition of ammonium perchlorate‐based cross‐linked composite modified double base propellant

Contact Info

Product

Resources

About