Structural transformation in nickel doped zinc oxide nanostructures

Goswami, Navendu; Sahai, Anshuman

doi:10.1016/j.materresbull.2012.10.045

Cited by 64 publications

(18 citation statements)

References 43 publications

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“…Although the XRD peak position did not exhibit any changes, some alteration was noted for peak intensity and width. In this case, introduction of Ag/Ni did not move the peak to a lower position, as [32,33]. In fact, the impurities for peak intensity for Ag metal increased as the stoichiometry increased at peak position (111).…”

Section: Photocatalytic Activitymentioning

confidence: 87%

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Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

et al. 2020

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Ag and Ni/ZnO photocatalyst nanostructures were successfully synthesized by a sol–gel method. In this work, the photocatalyst sample was systematically studied based on several factors affecting the performance of photocatalyst, which are size, morphology, band gap, textural properties and the number of active sites presence on the surface of the nanocatalyst. X-ray diffraction revealed that Ag/ZnO nanomaterials experienced multiple phases, meanwhile for Ni/ZnO the phase of nanomaterials were pure and single phase for stoichiometry less than 5%. Field emission scanning electron microscope (FESEM) showed almost all of the synthesized nanomaterials possessed a mixture of nanorods and spherical-like shape morphology. The Ag/ZnO showed high photocatalytic activity, producing at least 14th trials of nanocatalyst reusability on degradation of methyl orange under UV irradiation. Interestingly, this phenomenon was not observed in larger surface area of Ni/ZnO nanomaterials which supposedly favour photocatalytic activity, but instead producing poor photocatalytic performance. The main reasons were studied and exposed by temperature-programmed desorption of carbon dioxide (TPD–CO 2 ) which showed that incorporation of Ag into ZnO lattice has enhanced the number of active sites on the surface of the nanocatalyst. Whereas incorporation of Ni in ZnO has lowered the number of active sites with respect to undoped ZnO. Active sites measurement is effective and significant, providing opportunities in developing an intensive study as an additional factor.

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Section: Photocatalytic Activitymentioning

confidence: 87%

“…The Tauc plot graph and the extrapolation are illustrated in figures 4b and 5b for Ag and Ni/ZnO, respectively. [33,39]. Band gap has a significant role in determining the performance of photocatalysis.…”

Section: Band Gap Determinationmentioning

confidence: 99%

Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

et al. 2020

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“…Doping of ZnO with magnetic ions such as Ni introduces magnetic properties ultimately forming dilute magnetic semiconductors, which are interesting materials for application in the spintronic domain. In addition, nanosized nickel oxide has demonstrated other excellent properties such as catalytic 19) , electrochromic 20) , optical 16,21) and electrochemical properties 22) . There is considerable interest in the development of zinc-oxide-based (ZnO: transition metal) diluted magnetic semiconductors because of their high Curie temperature which is essential for spintronic devices 3) .…”

Section: 18)mentioning

confidence: 99%

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

Sayari

Mır

2015

KONA

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We have successfully synthesized (Ni,Al) co-doped ZnO nanostructured powders via the sol-gel technique at low temperature. The elemental analysis confirms the incorporation of the Ni and Al ions into the ZnO matrix. The structural study revealed that the nanopowder samples are assembled in flower-shaped Zn 0.9-x Ni 0.1 Al x O nanostructures with average crystallite sizes ranging from 39 to 53 nm. The XRD patterns show that the Zn 0.9-x Ni 0.1 Al x O nanopowders have a hexagonal wurtzite polycrystalline structure. Weak diffraction peaks related mainly to nickel oxides are also detected in the samples. The highest crystallite size, lowest lattice parameters and unit cell volume are obtained for the nanopowder samples that contain 1.5 at.% of aluminum. The decomposition process of the dried gel system is investigated by thermogravimetric analysis (TGA). Raman scattering and FT-IR measurements confirm the wurtzite structure of the synthesized Zn 0.9-x Ni 0.1 Al x O nanopowders. The energy band gap of the synthesized nanopowders (~3.32 eV) was estimated by using the Brus equation and the crystallite sizes obtained from XRD data, for comparison. The strain in the nanopowder samples (~2.7 × 10 -3 ) was also calculated according to the Stokes-Wilson equation.

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“…The 4F 1u modes are IR active [40,44]. F 1g , A 2u , 2E u , and 2F 2u are silent modes [45][46][47]. The unpolarized Raman spectrum of prepared nanomaterial is presented in Fig.…”

Section: Micro-raman Analysismentioning

confidence: 99%

Structural, optical and vibrational study of zinc copper ferrite nanocomposite prepared by exploding wire technique

Singh

Sahai

Katyal

et al. 2018

Materials Science-Poland

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We have synthesized zinc-copper ferrite (ZCFO) employing exploding wire technique (EWT). The X-ray diffraction (XRD) data confirm the formation of single phase spinel ZCFO, which is in good agreement with Fourier transform infrared spectroscopy (FT-IR), UV-Vis, and Raman spectroscopic analyses. It is also clearly seen in the SEM micrographs that the grains in ZCFO ferrite are very rough, which allows adsorption of gas like oxygen and therefore, the material can behave as active sensing surface. The size range of the grains in prepared sample is of 200 nm to 500 nm. The FT-IR spectrum of the nanocomposite consists of two broad bands, one at 580.4 cm−1 due to M–O stretching mode at the tetrahedral site and the other at 400.7 cm−1 due to M–O stretching mode at the octahedral site. The nanoparticles show a UV-Vis absorption band in the wavelength region of 400 nm to 700 nm. The energy band gap for the prepared nanomaterial was estimated to be 3.16 eV. Thus, the ferrite nanocomposite prepared by EWT is optically active. According to present literature, Raman spectroscopy study on zinc-copper ferrite system has not been reported till date. By suitable attributing various Raman modes, we have further confirmed the formation of ZCFO nanophase through the present novel approach.

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Structural transformation in nickel doped zinc oxide nanostructures

Cited by 64 publications

References 43 publications

Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

Comparative study on photocatalytic activity of transition metals (Ag and Ni)-doped ZnO nanomaterials synthesized via sol–gel method

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

Structural, optical and vibrational study of zinc copper ferrite nanocomposite prepared by exploding wire technique

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