X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Liao, Yen-Fa; Huang, Tzu-Wen; Lin, Ming-Zhe; Yu, Kuan-Li; Hsu, Hung-Chu; Lee, Tsung-Hsun; Lee, Chih‐Hao; Huang, Jung-Chun Andrew

doi:10.1016/j.jmmm.2006.10.774

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…Furthermore, the features observed for pure ZnO are broadened, probably due to the distortion of the crystal lattice. The oxygen K-edge of ZnO doped with iron and with cobalt mainly show the same spectral shape as pure ZnO with an additional peak due to the Fe–O and Co–O interaction. − The oxygen K-edges of the [Cd,Zn]O mixed oxides are discussed in the section on cadmium oxides.…”

Section: Solid Oxides Of S- and P-elementsmentioning

confidence: 99%

Oxygen K-edge X-ray Absorption Spectra

2020

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We review oxygen K-edge X-ray absorption spectra of both molecules and solids. We start with an overview of the main experimental aspects of oxygen K-edge X-ray absorption measurements including X-ray sources, monochromators, and detection schemes. Many recent oxygen K-edge studies combine X-ray absorption with time and spatially resolved measurements and/or operando conditions. The main theoretical and conceptual approximations for the simulation of oxygen K-edges are discussed in the Theory section. We subsequently discuss oxygen atoms and ions, binary molecules, water, and larger molecules containing oxygen, including biomolecular systems. The largest part of the review deals with the experimental results for solid oxides, starting from s-and p-electron oxides. Examples of theoretical simulations for these oxides are introduced in order to show how accurate a DFT description can be in the case of s and p electron overlap. We discuss the general analysis of the 3d transition metal oxides including discussions of the crystal field effect and the effects and trends in oxidation state and covalency. In addition to the general concepts, we give a systematic overview of the oxygen K-edges element by element, for the s-, p-, d-, and f-electron systems. CONTENTSNO CO Ions of Two Atom Oxides 4.4. Molecules with Three Atoms Renner Teller Effect O 3 NO 2 CO 2 4.5. Atomic Adsorption 4.6. Molecular Adsorption Linear Dichroism CO on Metal Surfaces 4.7. Analysis of Catalytic Reactions 5. Liquids and Solutions 5.1. Water 5.2. Bio-Organic Molecules Amino Acids, Polypeptides, and Proteins DNA Components 6. Solid Oxides of s-and p-Elements 6.1. Alkali Metal Oxides 6.2. Alkaline Earth Oxides 6.3. General Considerations of p-Element Oxides 6.4. Overview of p-Element Oxides 6.4.1. Boron Oxides

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Section: Solid Oxides Of S- and P-elementsmentioning

confidence: 99%

Oxygen K-edge X-ray Absorption Spectra

2020

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“…Moreover, DMS systems in nanostructured form can be useful components in magneto-optic and magneto-electronic devices and can also be ideal model systems to study dopant impurity dependent optical and electronic properties, finite size effects on magnetic ordering, anisotropy etc. Therefore, fabrication of well characterized nano-DMS systems is becoming increasingly important from the viewpoint of technology as well as fundamental scientific interest [2][3][4][5][6][7]. However, since different synthesis methods to produce one single DMS system are known to strongly modify the magnetic properties, this magnetism always remains clouded by experimental uncertainties, and the basic issue of whether the magnetism is intrinsic or not is never properly established [8].…”

Section: Introductionmentioning

confidence: 99%

Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals

et al. 2011

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Defect mediated high temperature ferromagnetism in oxide nanocrystallites is the central feature of this work. Here, we report the development of room temperature ferromagnetism in nanosized Co-doped barium titanate particles with a size of around 14 nm, synthesized by a solvothermal drying method. A combination of x-ray diffraction with state-of-the-art electron microscopy techniques confirms the intrinsic doping of Co into BaTiO3. The development of the room temperature ferromagnetism was tracked down to the different donor defects, namely hydroxyl groups at the oxygen site (OH·(O) and oxygen vacancies (V··(O), and their relative concentrations at the surface and the core of the nanocrystal, which could be controlled by post-synthesis drying and thermal treatments.

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“…Despite the fact that many synthesis methods for obtaining ZnO nanocrystals in aqueous solution at low temperature have been reported [5][6][7], the required conditions for bio-imaging are not simultaneously satisfied. Different dopants (Mg, Ni, Cu, Co, Mn, In, Al, Li, Na, and K) for ZnO have been reported to improve the electrical and ferromagnetic properties [8][9][10][11][12]. Therefore, the major tasks for making ZnO based bio-markers are: (1) to modify the bandgap of ZnO by doping with suitable cations to obtain photoluminescence (PL) emissions in visible wavelength range, (2) to ensure well controlled shape and size of the nanoparticles with particles size in the quantum confinement range (below 10 nm), (3) to provide surface functionalities to ensure the uptake of nanoparticles by the cells, (4) to confirm the photoluminescence emission from the cells after they have absorbed the biomarkers, and (5) to confirm the non-toxicity of the bio-markers.…”

Section: Introductionmentioning

confidence: 99%

Doped ZnO Colloids for Cancer Detection - Bio-Imaging and Cytotoxicity Study

Loh

et al. 2009

MRS Proc.

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We report the synthesis and surface modification of bio-friendly ZnO based colloids, which have been used for cancer cell detection providing significant advantages on quantum confinement effects, high emission brightness in UV to blue-violate range, non-toxicity and a unique dual color imaging feature. The ZnO nanoparticles were single crystal nanoparticles having spherical shape in size of 1-2 or 4-5 nm depending on the surface capping agents. All the colloidal solutions were stable for 30-45 days. The surface capping is a more effective technique in controlling the nanoparticle size, while dopants are effective in modifying the bandgap and optical properties. Unique dual colour images with blue colour in nucleus and turquoise colour in cytoplasm were obtained using either pure ZnO or Co doped ZnO colloids on human osteosarcoma (Mg-63) cells. The dual colour function is the combined effects of quantum confinement and the bio-compatible surface capping groups. The cytotoxicity study proved no cell proliferation by the nanoparticles up to the concentration of 1000 µg/mL, which is the highest concentration reported so far. Since a dosage of only 50-100µM is enough for the in vivo detection on rate, these ZnO colloids have high potential for use as the detection media for Labon-a-Chip devices.

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X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Cited by 9 publications

References 11 publications

Oxygen K-edge X-ray Absorption Spectra

Oxygen K-edge X-ray Absorption Spectra

Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals

Doped ZnO Colloids for Cancer Detection - Bio-Imaging and Cytotoxicity Study

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