Enhancing the saturation magnetisation in Ni doped ZnO thin films by TOPO functionalization

Nallusamy, Sivanantham; Gopalakrishnan, N.

doi:10.1016/j.jmmm.2019.04.089

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…The shift of the absorption peak value to the longer wavelength is due to the small increase of particle size with increasing Ni concentration. The optical band gap value was shown in Fig 6 ., as 3.37eV, 3.32eV, 3.29eVand 3.0eV for the synthesized Zn 1x Ni x O (x = 0.02, 0.04 and 0.06) nanoparticles respectively (30)(31)(32)(33).…”

Section: Uv-vis Spectral Analysismentioning

confidence: 90%

“…The average crystallite size was predicted to be 24-35 nm for synthesized Zn 1x Ni x O (x = 0, 0.02,0.04 and 0.06) nanoparticles annealed at 500 o C. The increase in particle size observed here with the increase in Ni concentration. This is due to doping level of Ni in ZnO nanoparticles [31][32][33][34].…”

Section: Xrd Structural Analysismentioning

confidence: 99%

“…So Zn 2+ replaced by Ni 2+ which gives high donor effect, charge separation and transport in the ZnO nanostructure. Ni doped ZnO nano material is used in several application fields, such as spintronics 28,29 , photo-electronics devices 30, 31, nano-sensors [32][33][34] , nano-generators, electronics devices, dye-sensitized solar cells, metal-ions detection, photo-catalytic, field emission devices, antifungal activity etc. Ni doped ZnO nanoparticles were prepared by various methods such as RF Sputtering, thermal evaporation , wet chemical, reflux, hydro thermal, chemical Co -precipitation, solvothermal, Sol gel, Spin coating techniques have also been reported by many researchers.…”

Section: Introductionmentioning

confidence: 99%

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EFFECT OF Ni-DOPING ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZnO NANOPARTICLES PREPARED BY CHEMICAL PRECIPITATION METHOD

TAMILSELVI¹,

VELMANI²,

RATHIDEVI³

2020

JOR

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Undoped ZnO nano particles and Ni doped ZnO nanoparticles prepared by chemical precipitation method and assessed for their structural, morphological and optical properties. The prepared undoped and Ni doped ZnO nanoparticles were characterized by using X-ray diffraction (XRD), Fourier transform infrared spectral (FTIR), UV-Visible spectrophotometer, Scanning electron microscopy (SEM) and Energy Dispersive X-ray analysis (EDAX), Photoluminescence spectra (PL). XRD pattern shows the purity of prepared undoped and Ni doped ZnO nanoparticles size. Scanning electron microscopy (SEM) observations revealed remarkable change in morphology of the prepared samples. The presence of functional groups and chemical bonding was confirmed by FTIR and UV analysis. The defect states were revealed from the UV and visible emissions of the photoluminescence spectra.

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Section: Uv-vis Spectral Analysismentioning

confidence: 90%

Section: Xrd Structural Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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EFFECT OF Ni-DOPING ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZnO NANOPARTICLES PREPARED BY CHEMICAL PRECIPITATION METHOD

TAMILSELVI¹,

VELMANI²,

RATHIDEVI³

2020

JOR

View full text Add to dashboard Cite

show abstract

“…Consequently, this contention motivates researchers to find an appropriate dopant in which neither the metal nor its compound is non-magnetic [19]. A few reported kinds of single TM ion-doped ZnO that facilitate RTFM are Ce [20], Ni [21], Mn [22], Cu [23], Fe [24] and Co [25]. Nevertheless, it is customary from the reported literature that Co, when doped in ZnO, has shown a higher T C value than other TM ions in the same ZnO system [25,26].…”

Section: Introductionmentioning

confidence: 99%

Evidence of room-temperature ferromagnetism in vertically aligned Bi–Co co-doped ZnO nanowires

Kazmi¹,

Ooi²,

Raza³

et al. 2021

J. Phys. D: Appl. Phys.

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We are the first to report Bi–Co co-doped zinc oxide nanowires (ZnO NWs) to investigate theoretically and experimentally the alignment of relative spin and the location of Bi3+ and Co2+ as the primary cause of magnetism. In the present study, we carefully performed theoretical and experimental studies of ZnO NWs prepared by the hydrothermal method and obtained exciting outcomes. The x-ray diffraction findings show that the NWs have a wurtzite crystal structure and high intensity at the (002) peak, indicating that most of the reflection comes from the hexagonal surface of the NWs. This means that the extended NWs are mainly aligned along the c-axis. The field-emission scanning electron microscope results show that, due to its anisotropic crystal existence, the grown NWs have a preferred path along the c-axis in the (001) direction. X-ray photoelectron spectroscopy studies established the presence of both Bi and Co in all the Bi–Co co-doped samples. They also showed that OH− groups exist on the surface of ZnO NWs, and increasing Co content tends to increase the O-deficient region in the ZnO matrix. UV–vis analysis showed a decreased optical band gap upon doping, which is probably due to the sp-d exchange interaction between localized d-electron bands of dopants. Optical studies also suggested that the doping induced an increase in electron concentration. The Raman results indicate that the ZnO NWs contain crystallization with few defects after Bi–Co-doping. From the magnetic studies, it was observed that the ferromagnetism probably originates from the defect-rich regions, i.e. NW surface and Bi and Co sit at ZnO’s substitutional site. In contrast, the core of the NWs remains under the other magnetic state. Our density functional theory studies are in line with the experimental results.

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Donor Defect Induced Ferromagnetism in Nb‐Doped ZnO Thin Films Grown by RF Magnetron Sputtering

Sukumaran,

Gopalakrishnan

2024

Physica Status Solidi (a)

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The effect of Nb doping concentration (0, 1, 2, and 4 at. %) on donor defect‐induced ferromagnetism in ZnO thin films is investigated. The films are deposited on Si(111) substrates utilizing the radio frequency magnetron sputtering. X‐ray diffraction pattern unveils that the films show a pronounced orientation along the (002) direction. The relative intensities of defect‐related bands with that of the ultraviolet band from photoluminescence (PL) spectra show that 2 at. % Nb doping results in a greater number of donor defects (Zni+ and VO+) in the ZnO lattice. The parameters extracted from the electron paramagnetic resonance spectra follow a similar trend. The results from vibrating sample magnetometer measurement indicate that pure ZnO displays diamagnetic nature, whereas Nb‐doped ZnO exhibits a ferromagnetic nature. The saturation magnetization value is found highest for 2 at. % Nb doping, which correlates with the presence of a greater number of donor defects, as supported by the PL and electron paramagnetic resonance results. Images obtained from atomic force microscopy show that the surface roughness of the ZnO thin film reduces upon Nb doping. X‐ray photoelectron spectroscopy validates that Nb is doped in 2 at. % Nb‐doped ZnO thin film with Nb oxidation state of +5.

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Enhancing the saturation magnetisation in Ni doped ZnO thin films by TOPO functionalization

Cited by 15 publications

References 30 publications

EFFECT OF Ni-DOPING ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZnO NANOPARTICLES PREPARED BY CHEMICAL PRECIPITATION METHOD

EFFECT OF Ni-DOPING ON THE STRUCTURAL AND OPTICAL PROPERTIES OF ZnO NANOPARTICLES PREPARED BY CHEMICAL PRECIPITATION METHOD

Evidence of room-temperature ferromagnetism in vertically aligned Bi–Co co-doped ZnO nanowires

Donor Defect Induced Ferromagnetism in Nb‐Doped ZnO Thin Films Grown by RF Magnetron Sputtering

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