Iron–iron oxide core–shell nanoparticles synthesized by laser pyrolysis followed by superficial oxidation

Dumitrache, Florian; Morjan, I.; Alexandrescu, R.; Ciupină, V.; Prodan, G.; Voicu, I.; Fleaca, C.; Albu, L.; Savoiu, M.; Sandu, I.; Popovici, E.; Soare, I.

doi:10.1016/j.apsusc.2005.01.037

Cited by 68 publications

(24 citation statements)

References 13 publications

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“…Co nanoparticles for technical grade high magnetization magnetic fluids, e.g for ferrohydrostatic bearings, were prepared by thermolysis of Co 2 (CO) 8 in the presence of Al(C 8 H 17 ) 3 [23]. Preparation of iron/iron oxide core-shell nanostructures by a two-steps laser pyrolysis procedure applied to iron pentacarbonyl (vapors) gas mixture is described in [24,25]. A careful in situ passivation process (mild surface oxidation) was performed in the second step on the primary collected nanoparticles to be used in ferrofluid preparation.…”

Section: Magnetic Nanoparticlesmentioning

confidence: 99%

Ferrofluids and Magnetorheological Fluids

Vékás

2008

Advances in Science and Technology

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Abstract. Composition, synthesis and structural properties of ferrofluids and magnetorheological fluids are reviewed and compared. The similarities and main differences between the two types of magnetically controllable fluids are outlined and exemplified in the paper. Chemical synthesis and structural characterization of magnetizable fluids for engineering and biomedical applications are thoroughly discussed.

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Section: Magnetic Nanoparticlesmentioning

confidence: 99%

Ferrofluids and Magnetorheological Fluids

Vékás

2008

Advances in Science and Technology

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“…This is due to a variety of applications they offer such as information storage (Kozicki et al, 2003), magneto optical devices (Kamat, 2002;Klein et al, 2005), magnetic fluids (Barclay, 1982), targeted drug delivery (Gangopadhyay et al, 2005;Dobson, 2006), sensing devices (Roumenin, 1994) and so on. Novel processing procedures have been developed for the synthesis of such materials and it has been established that process parameters sensitively control the structural evolution and result in newer properties (Dumitrache et al, 2005). At nanosize, the defects in the structure, the shape of the particle etc.…”

Section: Introductionmentioning

confidence: 99%

“…The coercivity was found to be much more in the oxide coated particles as compared to the case with pure iron. Fe / FeO particles were synthesized using laser pyrolysis by Dumitrache et al (2005) with mean core size of 14 nm and shell thickness 4 nm and were shown to agglomerate under their mutual magnetic interaction. The nanoparticles in these studies showed good crystallinity.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic structure of Fe-Fe oxide nanoparticles made by electrodeposition

Kumar¹,

Layek²,

Pandey³

et al. 2011

Int. J. Eng. Sci. Tech

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Iron/iron-oxide nano particles are synthesized using electrodeposition technique. The particles are well crystalline bcc iron with disordered oxides of iron on the surface. The particles show very small coercivity displaying superparamagnetic behavior of the iron core in magnetization measurement using Vibrating Sample Magnetometer. But the same particles show no trace of supermagnetism or fluctuation of magnetic moments in Mössbauer measurements, showing the role of time scales of measuring equipment in fine particle magnetism.

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“…[15][16][17][18][19] The fabricated and self-aligned iron wires proposed in this article have possible applications in magnetic-field measurement and calibration devices in pressure sensing where the resistivity of long thin iron resistors changes under stress. With a bulk Young's modulus of 190 GPa and yield strength of 12.6 GPa, which is comparable to single crystal or polycrystalline silicon, 20 the iron wires could also be used to produce nanoelectromechanical ͑NEM͒ devices.…”

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confidence: 99%

Fabrication of Self-Aligned Sub-100 nm Iron Wires by Selective Chemical Vapor Deposition

Low¹,

Bain²,

Bien³

et al. 2006

Electrochem. Solid-State Lett.

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We have demonstrated the ability to fabricate and self-align sub-100 nm iron wires using a combination of silicon nitride spacer technology and selective deposition of iron and tungsten by chemical vapor deposition ͑CVD͒. The discovery of selective deposition of CVD iron, from pentacarbonyl ͓Fe͑CO͒ 5 ͔ precursor, on silicon nitride surfaces over tungsten surfaces is the key factor that allows the self-alignment of iron wires. The density and conductivity of the CVD iron layers improved as the deposition temperature increased. Deposition time of 1 min was sufficient to deposit a perfectly aligned, continuous iron wire. The deposited iron layer shows 100% selectivity.In the world of microelectronics today, fabrication of fine metal lines or wires can be performed with a combination of advanced lithography and metal etching, chemical mechanical planarization ͑CMP͒, or metal lift-off. However, these techniques may not be the easiest or the most cost-effective. In lithography, there is always resolution and alignment issues such as how small a structure can be produced and how closely a structure can be aligned to another. Even when lithography issues have been solved, patterning of very fine metal lines can be a problem. Wet etching is no longer feasible when trying to produce submicrometer features because the isotropic etch produces large undercuts. Metal lift-off with sacrificial resist is one of the more common solutions to produce fine metal lines. The process has resist-imposed limitations where deposition must take place below 200°C because of resist thermal stability, preventing its use in CVD metal deposition.In this article, we demonstrate a method to produce sub -100 nm iron wires by a self-alignment process. In this process, very accurate alignment can be achieved because the alignment is not determined by the lithographic tool but by the structures and materials themselves. The fabrication of the wires can be divided into two parts. Initially, a fine silicon nitride ͑Si 3 N 4 ͒ line was formed by standard spacer technology. The spacer technique is commonly used in the fabrication of nanometer transistors and does not require the use of submicrometer lithographic tools. To produce the iron wires, we use the selective and self-aligning capability of CVD tungsten and iron. In this work, tungsten hexafluoride ͑WF 6 ͒ and iron pentacarbonyl ͓Fe͑CO͒ 5 ͔ are the respective tungsten and iron precursors.Selective CVD is an attractive process that enables the fabrication of structures not defined by the lithographic resolution. Many studies concerning the selective deposition of tungsten using a WF 6 precursor have been reported.

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Iron–iron oxide core–shell nanoparticles synthesized by laser pyrolysis followed by superficial oxidation

Cited by 68 publications

References 13 publications

Ferrofluids and Magnetorheological Fluids

Ferrofluids and Magnetorheological Fluids

Magnetic structure of Fe-Fe oxide nanoparticles made by electrodeposition

Fabrication of Self-Aligned Sub-100 nm Iron Wires by Selective Chemical Vapor Deposition

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