Fabrication and characterization of a diluted magnetic semiconducting TM co-doped Al:ZnO (TM=Co, Ni) thin films by sol–gel spin coating method

Siddheswaran, R.; Mangalaraja, R.V.; Tijerina, Eduardo Pérez; Menchaca, Jorge Luis; Meléndrez, Manuel; Ávila, Ricardo E.; Jeyanthi, C. Esther; Gómez, M. E.

doi:10.1016/j.saa.2013.01.017

Cited by 18 publications

(5 citation statements)

References 35 publications

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“…I can be seen from Figure 4, the surface of the Zn1 − xNixO films consists of a m lumnar and granular microstructures. Similar microstructures in AFM im were reported for Ni-doped ZnO films prepared by magnetron sputte sol-gel spin coating method [33][34][35] and pulsed laser deposition [36]. In part al.…”

Section: Resultssupporting

confidence: 72%

“…In addition, as can be seen from Figure 4, the surface of the Zn 1−x Ni x O films consists of a mixture of columnar and granular microstructures. Similar microstructures in AFM images recently were reported for Ni-doped ZnO films prepared by magnetron sputtering [30][31][32], sol-gel spin coating method [33][34][35] and pulsed laser deposition [36]. In particular, Gao et al [30] showed that surface roughness is affected by the oxygen partial pressure.…”

Section: Resultssupporting

confidence: 69%

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Growth of Zn1−xNixO Thin Films and Their Structural, Optical and Magneto-Optical Properties

et al. 2023

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The radio frequency (RF) reactive sputtering technique has been used to prepare Zn1−xNixO thin films with 0 ≤ x ≤ 0.08. Composite targets were obtained by mixing and pressing NiO and ZnO powders. Sapphire, quartz and glass were used as substrates. X-ray diffraction analysis of Ni-doped ZnO films indicates that all samples are crystalised in a hexagonal wurtzite structure with a preferred orientation along the (002) plane. Any secondary phase, corresponding to metallic nickel clusters or nickel oxides was not observed. High-resolution transmission electron microscopy (HR-TEM) image observed for Zn1−xNixO thin film shows a strong preferred orientation (texture) of crystalline columns in the direction perpendicular to the substrate surface. Different surface morphology was revealed in AFM images depending on the film composition and growth condition. Optical absorption spectra suggest the substitution of Zn2+ ions in the ZnO lattice by Ni2+ ions. The energy bandgap value was also found a complex dependence with an increase in Ni dopant concentration. In photoluminescence spectra, two main peaks were revealed, which are ascribed to near band gap emission and vacancy or defect states. Faraday rotation demonstrates its enhancement and growth of ferromagnetism with the increase in Ni content of Zn1−xNixO thin films at room temperature.

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Section: Resultssupporting

confidence: 72%

Section: Resultssupporting

confidence: 69%

Growth of Zn1−xNixO Thin Films and Their Structural, Optical and Magneto-Optical Properties

et al. 2023

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“…Recently, co-doped ZnO nanomaterials † with Al and transition metals have been investigated for scientific and practical interests. It was found that for the Ni and Al co-doped ZnO (Zn(Ni,Al)O) film, the ferromagnetic behavior was enhanced by increasing the Ni content [23][24][25] . However, the co-doping of ZnO with metallic ions such as nickel (Ni 2+ ) and aluminum (Al…”

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 average roughness R ms of these films was 65.7 nm, and the average grain size was 62. Structural and optical properties of Co and Ni doped ZnO thin films... magnetron sputtering [14] and sol-gel spin coating method [15]. It should be noted that the difference between AFM images for Co-doped and Ni-doped ZnO films is that nanorods in the first case are closed packed and tilted whereas for the second case columns are oriented perpendicularly to film substrate plane.…”

Section: Resultsmentioning

confidence: 99%

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

Stolyarchuk

Kleto

Dziedzic

2017

PCSS

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We have reported the effect of Co and Ni doping on structural and optical properties of ZnO thin films prepared by RF reactive sputtering technique. The composite targets were formed by mixing and pressing of ZnO, Mn 3 O 4 , CoO and NiO powders. The thin films were deposited on sapphire, quartz and glass substrates. The structure study confirms the formation of the hexagonal wurtzite ZnO without any secondary phase in transition metal (Co, Ni) -doped samples. Cross-sectional TEM images of all studied samples show a denseand uniformly textured structure composed of column-like structure along the growth direction. The surface morphology of the thin films was studied using atomic force microscopy (AFM). Different surface morphology (AFM) images were obtained depending on the film composition and growth conditions. Optical absorption spectra suggest of substitution Zn 2+ ions in ZnO lattice by transition metal atoms. The shift of the absorption edge due to decrease the energy band gap with increasing cobalt content and complex dependence of the energy band gap on content of nickel was observed in optical absorption spectra of the studied films. The room temperature photoluminescence peaks are attributed to near band gap emission and vacancy or defect states.

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Fabrication and characterization of a diluted magnetic semiconducting TM co-doped Al:ZnO (TM=Co, Ni) thin films by sol–gel spin coating method

Cited by 18 publications

References 35 publications

Growth of Zn1−xNixO Thin Films and Their Structural, Optical and Magneto-Optical Properties

Growth of Zn1−xNixO Thin Films and Their Structural, Optical and Magneto-Optical Properties

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

Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

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