<i>In situ</i>XPS analysis of various iron oxide films grown by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-assisted molecular-beam epitaxy

Fujii, Toru; Groot, Frank M. F. de; Sawatzky, G. A.; Voogt, F. C.; Hibma, T.; Okada, Kozo

doi:10.1103/physrevb.59.3195

Cited by 1,061 publications

(596 citation statements)

References 32 publications

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“…Figure 1 shows the Fe 2p core-level XPS spectrum of the ZnO:Fe nanoparticles in comparison with those of ␣-Fe 2 O 3 ͑Fe 3+ ͒, 23 FeO ͑Fe 2+ ͒, 23 and Fe 3 O 4 ͑Fe 3+ -Fe 2+ mixed-valence͒. 24 The Fe 2p 3/2 peak of the ZnO:Fe nanoparticles is split into two peaks at E B ϳ 710 and ϳ708 eV, corresponding to the energy positions of ␣-Fe 2 O 3 and FeO. The XPS spectrum of the ZnO:Fe nanoparticles therefore reflects an Fe 3+ -Fe 2+ mixed-valent state of the Fe ions in agreement with the previous Mössbauer report.…”

Section: Methodsmentioning

confidence: 99%

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka

Kobayashi

Sakamoto

et al. 2010

Journal of Applied Physics

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Articles you may be interested inEvidence of a cluster glass-like behavior in Fe-doped ZnO nanoparticles J. Appl. Phys. 115, 17E123 (2014) We have studied the electronic structure of Fe-doped ZnO nanoparticles, which have been reported to show ferromagnetism at room temperature, by x-ray photoemission spectroscopy, resonant photoemission spectroscopy, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism ͑XMCD͒. From the experimental and cluster-model calculation results, we find that Fe atoms are predominantly in the Fe 3+ ionic state with mixture of a small amount of Fe 2+ and that Fe 3+ ions are dominant in the surface region of the nanoparticles. It is shown that the room temperature ferromagnetism in the Fe-doped ZnO nanoparticles primarily originated from the antiferromagnetic coupling between unequal amounts of Fe 3+ ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of ϳ2 -3 nm.

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Section: Methodsmentioning

confidence: 99%

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka

Kobayashi

Sakamoto

et al. 2010

Journal of Applied Physics

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“…Two weak but well defined peaks at approximately 710.8 eV and 724.2 eV, are observed, in agreement with the typical values of the Fe 2p 3/2 and 2p 1/2 core-level XPS peaks for ferric oxides. 21,22 In addition, the main Fe 2p 3/2 and 2p 1/2 peaks are accompanied by weak satellite structures on their high binding energy side, about 8 eV above the respective Fe 2p line. Such a spectrum is typical of Fe 2 O 3 oxides ͑␣-and ␥-Fe 2 O 3 polymorphs͒.…”

Section: A Tem Xrd and Xps Techniquesmentioning

confidence: 98%

In vitro studies on ultrasmall superparamagnetic iron oxide nanoparticles coated with gummic acid for T2 MRI contrast agent

et al. 2007

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Ultrasmall superparamagnetic iron oxide nanoparticles coated with gummic acid have been investigated as possible constituents of aqueous ferrofluids for biomedical applications and especially for MRI contrast agent. The structural characteristics and the size of the nanoparticles have been analyzed as well as the magnetic properties. In order to evaluate any possible capabilities as a contrast agent, the relaxation time, T2, of hydrogen protons in the colloidal solutions of nanoparticles have been measured in order to gain information on the relaxation behavior compared to other MRI contrast agents. The in vitro cytotoxicity of the obtained magnetic nanoparticles of iron oxide coated with gummic acid was investigated by two separate methods ͑MTT and FACS analysis͒ and by using three different normal and transformed cell lines. Our results showed that the synthesized nanoparticles had no toxic effect on any of the cell lines used.

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“…The Fe 2p spectra revealed that iron exists predominately as Fe 3+ , with a 2p 3/2 peak position of 710.9 eV. [28] Of interest is the location of the 2p 3/2 shake-up satellite peak. For moderate heat treatments, a characteristic hematite satellite peak at approximately 719 eV was observed.…”

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confidence: 99%

“…[28] Introduction of tetravalent Sn ions into the hematite lattice by either substitution or by occupation of vacant interstitial sites requires partial reduction of Fe to maintain charge neutrality, and could account for the observed satellite behavior. [29,30] It has been proposed that the mutual existence of Fe in two valence states creates a hopping mechanism for conductivity that may contribute to improved PEC performance.…”

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confidence: 99%

Activation of Hematite Nanorod Arrays for Photoelectrochemical Water Splitting

et al. 2011

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In situXPS analysis of various iron oxide films grown byNO2-assisted molecular-beam epitaxy

Abstract: We report on a systematic analysis of x-ray photoelectron spectroscopy ͑XPS͒ core-and valence-level spectra of clean and well-characterized iron oxide films, i.

Cited by 1,061 publications

References 32 publications

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

In vitro studies on ultrasmall superparamagnetic iron oxide nanoparticles coated with gummic acid for T2 MRI contrast agent

Activation of Hematite Nanorod Arrays for Photoelectrochemical Water Splitting

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