Electronic states of self stabilized L10 FePt alloy nanoparticles

Medwal, Rohit; Sehdev, Neeru; Govind,; Annapoorni, S.

doi:10.1007/s00339-012-7080-6

Cited by 26 publications

(13 citation statements)

References 33 publications

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“…The nanoparticles exposed to one shot of hydrogen plasma exhibit the formation of the carbonaceous layer with G band centred at 1600 cm −1 with an evolution of D band at 1360 cm −1 , as shown in figure 3a. The evolution of D and G bands is also reported earlier by our group as a function of different annealing temperatures [15,20]. This confirms the graphitization of organic layer over the FePt due to high-energy hydrogen plasma/ions exposure.…”

Section: Resultssupporting

confidence: 88%

“…In order to see the effect of hydrogen plasma on the organic capping, Raman spectroscopy as a function of plasma focus irradiation shots on FePt nanoparticles was performed. As-deposited nanoparticles capped with oleic acid and oleylamine do not show Raman spectra as reported earlier [15]. The nanoparticles exposed to one shot of hydrogen plasma exhibit the formation of the carbonaceous layer with G band centred at 1600 cm −1 with an evolution of D band at 1360 cm −1 , as shown in figure 3a.…”

Section: Resultssupporting

confidence: 56%

“…However, one of the issues in chemical synthesis methods is that the organic capping, like oleylamine and oleic acid, used to control the particle size also reduces long-range organization of the nanoparticles over the substrate. The organic capping can be removed by various physical and chemical processes like chemical etching, thermal degradation, sputtering and different types of plasma treatment [15,16]. The chemical methods involve the removal of capping using suitable solvents that can dissolve organic capping.…”

Section: Introductionmentioning

confidence: 99%

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Dense-plasma-driven ultrafast formation of FePt organization on silicon substrate

et al. 2017

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This article demonstrates the removal of organic capping and promotion of long-range 2D organization of chemically synthesized FePt nanoparticles dispersed on Si 100 substrate by means of pulsed H + energetic ion irradiation using a dense plasma focus (DPF) device. The irradiation of energetic H + ions on FePt nanoparticles clearly resulted in enhanced structural and magnetic behaviour of the FePt nanoparticles as a function of plasma focused irradiation shots. Transmission electron microscopy (TEM)/scanning electron microscopy (SEM) images of the FePt nanoparticles clearly show a marked enhancement in average particle size from 2.5 nm for nonirradiated sample to about 28 nm for four plasma focus shots irradiation. The gradual removal of organic capping over chemically synthesized FePt nanoparticles with increasing plasma focus shots exposure is confirmed using Raman spectroscopy. A uniform 2D organization of bimetallic FePt nanoparticles over 1 cm × 1 cm silicon substrate is obtained with three plasma focus shots with better magnetic properties as compared with plasma-untreated FePt nanoparticles.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Dense-plasma-driven ultrafast formation of FePt organization on silicon substrate

et al. 2017

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“…The control of the composition of Fe and Pt in Fe x Pt 1 − x and its manifestation on their magnetic and structural properties have been a topic of major interest by several groups [24]. The high magnetocrystalline anisotropy (K u~7 × 10 7 J/m 3 ) and chemical stability of these alloy nanoparticles make it a good candidate for ultrahigh density magnetic recording material and also as a permanent magnet.…”

Section: Introductionmentioning

confidence: 99%

“…The preparation of nanoscale magnetic materials is an extremely active research area due to its potential use in ultrahigh density magnetic recording, highly sensitive magnetic sensors, permanent magnets using magnetic nanocomposites, biomedical applications, magneto-optical systems and in numerous other areas [21][22][23][24][25][26]. The control of the composition of Fe and Pt in Fe x Pt 1 − x and its manifestation on their magnetic and structural properties have been a topic of major interest by several groups [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of functionalization on positional ordering of 3 nm FePt nanoparticles: Langmuir–Blodgett monolayer

Medwal

Gogia

Thakar

et al. 2014

Surface and Coatings Technology

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Development of Highly Stable and Mass Transfer‐Enhanced Cathode Catalysts: Support‐Free Electrospun Intermetallic FePt Nanotubes for Polymer Electrolyte Membrane Fuel Cells

Lee

Yoo

et al. 2015

Advanced Energy Materials

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Proton exchange membrane fuel cells (PEMFCs) are an alternative clean energy source and they are attracting increased attention. However, several limitations such as degradation of the carbon support and Nafion ionomer in the cathode electrode must be overcome for practical applications of PEMFCs. Support‐free 1D‐ordered intermetallic nanotubes (NTs) are considered as promising candidates for highly active and durable cathode catalysts in PEMFCs. However, 1D nanotubes are difficult to produce at large scale because they have generally been synthesized using a template‐based method that requires multistep synthetic routes. Herein, a simple and scalable method to produce ordered‐intermetallic FePt nanotubes by electrospinning is reported. When tested as cathode catalysts, under the US Department of Energy's reference condition, the activity of face‐centered‐tetragonal (fct) FePt NTs surpasses that of commercial Pt/C. In an accelerated degradation test at 1.4 V for 3 h, the degradation activity rate of fct‐FePt NTs is only 10%, whereas that of commercial Pt/C catalysts is 65%. For practical PEMFCs, this approach would provide simple routes to support‐free intermetallic nanotube structures with superior kinetic activity and higher durability than those of commercial Pt/C catalyst.

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Electronic states of self stabilized L10 FePt alloy nanoparticles

Cited by 26 publications

References 33 publications

Dense-plasma-driven ultrafast formation of FePt organization on silicon substrate

Dense-plasma-driven ultrafast formation of FePt organization on silicon substrate

Effect of functionalization on positional ordering of 3 nm FePt nanoparticles: Langmuir–Blodgett monolayer

Development of Highly Stable and Mass Transfer‐Enhanced Cathode Catalysts: Support‐Free Electrospun Intermetallic FePt Nanotubes for Polymer Electrolyte Membrane Fuel Cells

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