Journal ArticleDOI
Cathodoluminescence and room temperature ferromagnetism of Mn-doped ZnO nanorod arrays grown by chemical vapor deposition
TLDR
In this paper, the appearance of room temperature ferromagnetism in Mn-doped ZnO nanorods was investigated. But the results showed that oxygen vacancies played an important role in their appearance.Abstract:
Mn-doped ZnO nanorods are prepared by a chemical vapor deposition method using zinc and MnO2 powders as source materials of Zn and Mn, respectively. Cathodoluminescence (CL) characterization indicates that the Mn-doped ZnO nanorods grown at different growth temperatures have different oxygen vacancy concentrations. Room temperature ferromagnetism with a saturation magnetization of 0.87μB∕Mn has been observed in Mn-doped ZnO nanorods grown at 650°C, in which moderate oxygen vacancy concentration is observed by CL characterization. It is also found that oxygen vacancies play an important role in the appearance of room temperature ferromagnetism in Mn-doped ZnO nanorods.read more
Citations
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Journal ArticleDOI
Aqueous Synthesis of Mn- and Co-Doped ZnO Nanorods
TL;DR: In this article, the optical and magnetic properties of Mn-and Co-doped ZnO nanorods fabricated via a simple one-step aqueous-based chemical method were reported.
Journal ArticleDOI
Diluted magnetic semiconductors: Mn/Co-doped ZnO nanorods as case study
Igor Djerdj,Georg Garnweitner,Denis Arčon,Denis Arčon,Matej Pregelj,Zvonko Jagličić,Markus Niederberger +6 more
TL;DR: The structure and magnetic properties of 3 and 5 mol% (based on the starting concentrations) Co- and Mn-doped ZnO nanorods, synthesized by a straightforward and experimentally simple nonaqueous sol-gel route based on benzyl alcohol as solvent, have been investigated by various characterization techniques, including X-ray diffraction with Rietveld refinement, high-resolution transmission electron microscopy, selected area electron diffraction, energy dispersive Xray spectroscopy, magnetization measurements and electron paramagnetic resonance as mentioned in this paper.
Journal ArticleDOI
Morphological evolution between nanorods to nanosheets and room temperature ferromagnetism of Fe-doped ZnO nanostructures
TL;DR: In this paper, undoped and Fe-doped single-crystalline ZnO nanostructures were successfully synthesized by a facile microwave irradiation method.
Journal ArticleDOI
High-performance self-powered/active humidity sensing of Fe-doped ZnO nanoarray nanogenerator
TL;DR: In this paper, the authors demonstrate a new material system for high-performance self-powered/active humidity sensors from Fe-doped ZnO nanoarrays, which can be used to enhance the screening effect and decrease the piezoelectric output.
Journal ArticleDOI
Room temperature ferromagnetism with high magnetic moment and optical properties of Co doped ZnO nanorods synthesized by a solvothermal route
TL;DR: In this paper, the intrinsic exchange interaction of Co ions and VZn, Oi related defects was quantitatively analyzed and explained using a bound magnetic polaron model and provided a better insight into the underlying mechanisms of high temperature ferromagnetism in Zn1−xCoxO NRs.
References
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Journal ArticleDOI
Zener Model Description of Ferromagnetism in Zinc-Blende Magnetic Semiconductors
TL;DR: Zener's model of ferromagnetism, originally proposed for transition metals in 1950, can explain T(C) of Ga(1-)(x)Mn(x)As and that of its II-VI counterpart Zn(1)-Mn (x)Te and is used to predict materials with T (C) exceeding room temperature, an important step toward semiconductor electronics that use both charge and spin.
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Correlation between photoluminescence and oxygen vacancies in ZnO phosphors
TL;DR: By combining electron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopy, a strong correlation is observed between the green 510 nm emission, the free-carrier concentration, and the density of singly ionized oxygen vacancies in commercial ZnO phosphor powders as mentioned in this paper.
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Ultraviolet-emitting ZnO nanowires synthesized by a physical vapor deposition approach
TL;DR: In this article, the unidirectional growth of the ZnO nanowires was controlled by the conventional vapor-liquid solid mechanism, and the observed room temperature UV emission was ascribed to the decrease in structure defects as compared to bulk materials.
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Raman Spectra of Ti O 2 , Mg F 2 , Zn F 2 , Fe F 2 , and Mn F 2
TL;DR: In this paper, the first-order Raman spectra have been measured at room temperature in five materials of the point group: Ti${\mathrm{O}}_{2}$, Mg${1g}$, Zn${2g}, Fe${3g} and Mn${4g}.
Journal ArticleDOI
Magnetic quantum dots: synthesis, spectroscopy, and magnetism of Co2+ - and Ni2+-doped ZnO nanocrystals.
TL;DR: Ferromagnetism with T(C) > 350 K is observed in aggregated nanocrystals of Co(2+):ZnO that unambiguously demonstrates the existence of intrinsic high-T(C), ferromagnetsism in this class of DMSs.