The effect of stoichiometry on the structural, thermal and electronic properties of thermally decomposed nickel oxide

Dubey, Paras; Kaurav, Netram; Devan, Rupesh S.; Okram, G. S.; Kuo, Yung-Chi

doi:10.1039/c8ra00157j

Cited by 180 publications

(89 citation statements)

References 41 publications

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“…The lattice parameters and unit cell volume of the pure samples are also listed in Table 1 , showing good agreement with those published in the literature. 27 , 33 − 35 However, an increase in the cell volume and lattice parameters was observed when compared with ICSD no. 14000 30 and no.…”

Section: Resultsmentioning

confidence: 89%

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

et al. 2020

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Black NiO powders were prepared by a hydrothermal method. Moreover, the visible light-driven Ag 3 PO 4 /NiO photocatalyst composites were successfully synthesized by in situ precipitation method. These samples were structurally characterized by X-ray diffraction and Rietveld refinement. The strong interaction between the phases and the defects in the samples was affected by the formation of the composites, as identified by Fourier transform infrared spectroscopy and Raman spectroscopy. UV–vis diffuse reflectance spectroscopy exhibited enhanced light absorption for all Ag 3 PO 4 /NiO composites, suggesting the effective interaction between the phases. Moreover, field-emission scanning electron microscopy images revealed the presence of NiO microflowers composed of nanoflakes in contact with Ag 3 PO 4 microparticles. The composite with 5% NiO presented enhanced photocatalytic efficiency in comparison with pure Ag 3 PO 4 , degrading 96% of rhodamine B (RhB) dye in just 15 min under visible light; however, the recycling experiments confirmed that the composite with 75% NiO showed superior stability. The recombination of the electron–hole pairs was considered for the measurement of the photoluminescence of the samples. These measurements were performed to evaluate the possible causes for the difference in the photocatalytic responses of the composites. From these experimental results, possible photocatalytic mechanisms for RhB degradation over Ag 3 PO 4 /NiO composites under visible-light irradiation were proposed.

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Section: Resultsmentioning

confidence: 89%

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

et al. 2020

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“…In figure 5(b), the Ni 2p core level spectrum consists of satellite and two sublevel peaks of Ni 2p 3/2 and Ni 2p 1/2 occurred by spin-orbit splitting. The sublevel peaks are contained with six deconvoluted peaks (Ni 1-Ni 6), which was assigned to Ni 2+ and Ni 3+ [26][27][28]. The O 1s core level spectrum of NiO film was resolved into five peaks (O 1-O 5) as shown in figure 5(c).…”

Section: Resultsmentioning

confidence: 99%

Investigation of NiO film by sparking method under a magnetic field and NiO/ZnO heterojunction

Tippo

Thongsuwan

Wiranwetchayan

et al. 2020

Mater. Res. Express

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Nickel oxide (NiO) film receives attention from the field of optoelectronics due to its wide band gap and high transparency. By using a sparking method, the deposition of the NiO film is facile and unique. However, the NiO film made by the sparking method indicates a porous surface with an agglomeration of its particles. In order to reduce the porousness of the NiO film, the assistance of a permanent magnet in the sparking apparatus is presented. Here, we report the investigation of the NiO film and the p-NiO/n-ZnO heterojunction deposited by the sparking method under a magnetic field. Our results demonstrate that the porosity of the NiO film was reduced by increasing the magnitude of a magnetic field from 0 mT to 375 mT. Furthermore, the crystallinity and the electrical properties of the NiO film are improved by the influent of a magnetic field. For heterojunction, the best device shows the rectification ratio of 95 and the ideality factor of 4.92. This work provides an alternative method for the deposition of the NiO film with promising applications in optoelectronic devices.

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“…5 a–e, it was found that the Ni 2p core level spectra of 0 M, 0.05 M, 0.1 M, 0.15 M and 0.2 M Co-NiO films consist of satellite and sublevel peaks of Ni 2p 3/2 and Ni 2p 1/2 . These sublevel peaks were resolved into six peaks (Ni 1 to Ni 6), which Ni 1, Ni 2, Ni 4 and Ni 5 peaks were assigned to Ni 2+ and the remaining peaks (Ni 3 and Ni 6) were registered to Ni 3+ 33 , 34 . The Ni 1 to Ni 6 peaks of 0 M, 0.05 M, 0.1 M, 0.15 M and 0.2 M Co-NiO films have a similar location but their intensity is different because the number of Ni 3+ and Ni 2+ ions in each condition is not equal, depending on Co concentration.…”

Section: Resultsmentioning

confidence: 99%

Influence of Co concentration on properties of NiO film by sparking under uniform magnetic field

Tippo

Thongsuwan

Wiranwetchayan

et al. 2020

Sci Rep

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Nickel oxide (NiO) films cover numerous electronic applications, including transparent conducting oxides and hole transport layer, because of its high transparency and wide band gap. A sparking discharge is a new and unique method for the deposition of NiO films due to non-complex operation and non-requirement of a vacuum atmosphere. Unfortunately, NiO films by the sparking method display a porous surface with inferior crystallinity. By assisting a uniform magnetic field in the sparking method, the porous and the crystallinity of NiO are improved. However, electrical properties of the NiO films deposited by this strategy are poor. In order to improve the electrical properties of NiO, a substitutional of Ni ions by Co ions is considered. In this study, we report an influence of Co concentration on properties of NiO films by sparking under a uniform magnetic field. Our results indicate that an increase in Co concentration to 0.1 M improves the crystallinity and increases a carrier concentration of NiO, resulting in a reduction of the resistivity. This consequence is in agreement with the increase in a number of higher-valence Ni3+ because of the Co2+ substituted Ni2+. Based on our research, Co-NiO film is promising materials for a transparent conductor.

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The effect of stoichiometry on the structural, thermal and electronic properties of thermally decomposed nickel oxide

Abstract: A thermal decomposition route with different sintering temperatures was employed to prepare non-stoichiometric nickel oxide (Ni1−δO) from Ni(NO3)2·6H2O as a precursor.

Cited by 180 publications

References 41 publications

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Investigation of NiO film by sparking method under a magnetic field and NiO/ZnO heterojunction

Influence of Co concentration on properties of NiO film by sparking under uniform magnetic field

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The effect of stoichiometry on the structural, thermal and electronic properties of thermally decomposed nickel oxide

Abstract: A thermal decomposition route with different sintering temperatures was employed to prepare non-stoichiometric nickel oxide (Ni1−δO) from Ni(NO3)2·6H2O as a precursor.

Cited by 180 publications

References 41 publications

Ag3PO4/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Ag3PO4/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Investigation of NiO film by sparking method under a magnetic field and NiO/ZnO heterojunction

Influence of Co concentration on properties of NiO film by sparking under uniform magnetic field

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Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light

Ag₃PO₄/NiO Composites with Enhanced Photocatalytic Activity under Visible Light