Hydrogen Incorporation in Undoped ZnO Nanoparticles

Prakoso, Suhendro Purbo

doi:10.4236/wjcmp.2011.14019

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…The lattice constants were calculated from the Rietveld refinement of the diffraction pattern using the MAUD program and are summarized in Table 1. The results are comparable with those of undoped ZnO [27] and CoO [29].…”

Section: Resultssupporting

confidence: 78%

The Effect of Co Incorporation into ZnO Nanoparticles

Djaja¹,

Montja²,

Saleh³

2013

AMPC

115

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Co-doped ZnO nanoparticles are synthesized by co-precipitation method. The incorporation of Co ions into ZnO wur- zite structure with increasing Co concentrations was followed by X-ray diffraction. Sample structures were further studied by infrared spectra, from which a broad and strong absorption band in the range of 400 - 700 cm^-1 and -OH stretching vibrational mode approximately 3400 cm^-1 were observed. Ultraviolet-visible measurements showed a red shift of the absorption edge and four peaks at 468, 515, 577 and 629 nm in its reflectance spectra with increasing Co content. Magnetic measurements showed a ferromagnetic behavior for all samples. From the ESR spectra the presence of Co-metal clusters and Co-oxide precipitates are not observed and can be excluded as the origin of ferromagnetic in our samples. The ESR results are supported by UV-Vis measurements data.

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Section: Resultssupporting

confidence: 78%

The Effect of Co Incorporation into ZnO Nanoparticles

Djaja¹,

Montja²,

Saleh³

2013

AMPC

115

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“…The lattice parameters are estimated from the XRD peaks positions and refined using Rietveld analysis technique. The lattice parameters of undoped ZnO particles were a = 0.3218 nm and c = 0.5155 nm, which is similar with a standard values [19]. For Cu-doped ZnO samples, the lattice parameters are slightly higher than undoped ZnO.…”

Section: Resultssupporting

confidence: 71%

Co-Precipitation Synthesis and Characterization of Nanocrystalline Zinc Oxide Particles Doped with Cu<sup>2+</sup> Ions

Mukhtar¹,

Munisa²,

Saleh³

2012

MSA

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Nanocrystalline Cu-doped ZnO particles were synthesized by the co-precipitation method. The composition, structural, optical and magnetic characterizations were performed by energy dispersive X-Ray spectroscopy, X-Ray diffraction, UV-Visible spectrometer, and vibrating sample magnetometer. The results confirmed that nanocrystalline Cu-doped ZnO particles have a hexagonal wurtzite structure with a high degree of crystallization and a crystallite size of 10 -16 nm. For Cu above 11 at%, the X-Ray diffraction pattern possessed CuO secondary phase which shows the solubility limit of Cu in the ZnO lattice. Up to 11% at Cu, the presence of Cu in the ZnO lattice as Zn substitution indicated by an in-crease in lattice parameter values. Nanoparticles showed weak ferromagnetic characteristics at room temperature. The absence of secondary phase related to magnetic precipitate shown intrinsic ferromagnetic behaviour.

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“…73 The red-shift in ZnO has been explained by several authors based on variation of the average particle size. 77 This explanation is also consistent with our SEM observation. We believe that in our ZnO samples, the optical gap decreases not only due to the particle size but also due to the incorporation of hydrogen in the samples.…”

Section: ■ Results and Discussionsupporting

confidence: 93%

“…The red-shift of the absorption edge and E g by adding H 2 has been witnessed by Zhu et al After the hydrogenation, the band gap decreased, which might be due to the passivation of the V O by H + . The red-shift in ZnO has been explained by several authors based on variation of the average particle size . This explanation is also consistent with our SEM observation.…”

Section: Resultssupporting

confidence: 92%

Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of ZnO

et al. 2019

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In this work, we report direct evidence of ferromagnetism in hydrogenated ZnO sub-micrometric powders. Hydrogen (H2) was incorporated under a high-pressure heat treatment in a sealed reactor. Ferromagnetism at room temperature can be activated and deactivated by annealing in H2 and air atmospheres, respectively. Hydrogen incorporation in ZnO structure was observed from X-ray absorption near-edge structure spectra where hydrogen acts as a shallow donor transferring electrons to the conduction band (Zn 4s). The Raman measurements evidence clear distortions in chemical environments of Zn atoms associated with defect formation. Our results suggest that magnetism is a superficial phenomenon probably related to the surface bonding of hydrogen to Zn (or O) on polar ZnO surfaces.

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Hydrogen Incorporation in Undoped ZnO Nanoparticles

Abstract: ABSTRACT

Cited by 11 publications

References 30 publications

The Effect of Co Incorporation into ZnO Nanoparticles

The Effect of Co Incorporation into ZnO Nanoparticles

Co-Precipitation Synthesis and Characterization of Nanocrystalline Zinc Oxide Particles Doped with Cu<sup>2+</sup> Ions

Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of ZnO

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Hydrogen Incorporation in Undoped ZnO Nanoparticles

Abstract: ABSTRACT

Cited by 11 publications

References 30 publications

The Effect of Co Incorporation into ZnO Nanoparticles

The Effect of Co Incorporation into ZnO Nanoparticles

Co-Precipitation Synthesis and Characterization of Nanocrystalline Zinc Oxide Particles Doped with Cu&lt;sup&gt;2+&lt;/sup&gt; Ions

Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of ZnO

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Co-Precipitation Synthesis and Characterization of Nanocrystalline Zinc Oxide Particles Doped with Cu<sup>2+</sup> Ions