Structural and optical properties of undoped and aluminium doped zinc oxide nanoparticles via precipitation method at low temperature

Suwanboon, Sumetha; Amornpitoksuk, Pongsaton; Haidoux, A.; Tedenac, Jean‐Claude

doi:10.1016/j.jallcom.2007.08.048

Cited by 164 publications

(74 citation statements)

References 14 publications

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“…By comparison of our experiments with those of e.g. Suwanboon 47 we confirm that not only the nominal amount of Al in the ZnO determines their morphology and other properties but other factors are of importance too. Possibly, the effective Al uptake, which differs from the nominal amount (see further), as well as the mechanism and kinetics of nanoparticle formation, determined by the synthesis conditions, play a key role.…”

Section: Resultssupporting

confidence: 74%

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

et al. 2013

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Section: Resultssupporting

confidence: 74%

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

et al. 2013

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“…This might be due to the small quantity of aluminium which can substitute the tetrahedral or octahedral sites in the ferrite structure; therefore, there is no change of peak positions when doping ferrites with aluminium in this study. The XRD patterns correspond to similar observations made by Suwanboon et al with aluminium doped nanoparticles [18]. The average crystallite size of the prepared ferrite particles were calculated from the width of the most intense diffraction peak (311) by means of the Debye-Scherrer equation [19]: (2) where t is the crystallite size, β is the full width of the diffraction line at half maximum (FWHM) intensity measured in radians, λ is the X-ray wavelength of the Cu Kα = 1.54 Å, and θ refers to the Bragg's angle.…”

Section: Electrochemical Measurementssupporting

confidence: 89%

Aluminium-doped Nickel Copper Ferrites for high-performance Supercapacitors

2016

IJRCMCE

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Abstract-A novel aluminium-doped nickel copper ferrite nanomaterial prepared via the sol-gel method is considered as potential electrode material for supercapacitors. The morphology, chemical composition and crystallinity have been investigated by scanning electron microscope, energy dispersive spectroscopy and Xray diffraction respectively. Electrochemical properties of the undoped and aluminium-doped nickel copper ferrite supercapacitor electrodes have been investigated by cyclic voltammetry and galvanostatic charge/ discharge measurements in 1M KOH. A specific capacitance of 412.5 Fg .

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“…40,41 The Burstein-Moss effect is frequently observed in n-type semiconductors. 42,43 Electron-doped ZnO with a high concentration of n-type carriers is easily achievable, because intrinsic defects in ZnO may render it naturally n-type. 23,44 An increase in the carrier concentration in Ni-doped ZnO will cause the Fermi level to move into the conduction band.…”

Section: Optical Propertiesmentioning

confidence: 99%

Photoluminescence studies on structural defects and room temperature ferromagnetism in Ni and Ni–H doped ZnO nanoparticles

Tong

Chen

Han

et al. 2010

Journal of Applied Physics

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We explore the effects of hydrogenated annealing on the crystal structure, room temperature ferromagnetism (RT-FM) and photoluminescence (PL) properties of Ni-doped ZnO (Zn1−xNixO, x=0.0 to 0.2) nanoparticles prepared by a sol-gel method. The x-ray photoelectron spectra and x-ray diffraction data provide evidence that Ni has been incorporated into the wurtzite ZnO lattice as Ni2+ ions substituting for Zn2+ ions at x≤0.05. A secondary phase of NiO type begins to form inside ZnO when x>0.05 and segregates from ZnO host lattice at x=0.2, leading to a large variation in the lattice constants of ZnO. The magnetization measurements show that the saturation magnetization (Ms) increases with increasing Ni concentration in the single-phase Zn1−xNixO (x≤0.05) nanoparticles. The secondary phase formation reduces the magnetization of Zn1−xNixO (x=0.1 and 0.15), while the segregation of NiO from the ZnO lattice at x=0.2 is accompanied by a large increase in Ms again. The PL measurements show that the UV emission intensity of single-phase Zn1−xNixO (x≤0.05) nanoparticles increases with a blueshift in the UV emission line when the Ni concentration increases, while the dominant green emission intensity decreases with increasing Ni dopant. The PL data strongly suggest that the FM in single-phase Zn1−xNixO (x≤0.05) nanoparticles is intrinsically correlated with a doping induced increase in the electron concentration in the conduction band of Ni-doped ZnO. After H2-annealing, the single-phase Zn1−xNixO:H (x≤0.05) nanoparticles show increases in both coercivity and saturation magnetization. The PL and diffuse reflectance spectra suggest that hydrogen-related shallow donors and an improved sample quality may be responsible for the H2-annealing induced enhancement of the RT-FM. The obvious correlation between FM and carrier concentration in Ni and Ni–H doped ZnO points towards a mechanism of carrier-mediated FM for Ni-doped ZnO diluted magnetic semiconductors.

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Structural and optical properties of undoped and aluminium doped zinc oxide nanoparticles via precipitation method at low temperature

Cited by 164 publications

References 14 publications

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

Aluminium-doped Nickel Copper Ferrites for high-performance Supercapacitors

Photoluminescence studies on structural defects and room temperature ferromagnetism in Ni and Ni–H doped ZnO nanoparticles

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