Facile one-pot synthesis of water-soluble fcc FePt3 alloy nanostructures

Abstract

Proccessible FePt3 alloy nanoparticles with sizes smaller than 50 nm open the avenue to novel magnetic sensor, catalytic and biomedical applications. Our research objective was to establish a highly scalable synthesis technique for production of single-crystalline FePt3 alloy nanoparticles. We have elaborated a one-pot thermal decomposition technique for the synthesis of superparamagnetic FePt3 nanoparticles (FePt3 NPs) with mean sizes of 10 nm. Subsequent tiron coating provided water solubility of the FePt3 NPs and further processibility as bidental ligands enable binding to catalyst surfaces, smart substrates or biosensors. The chemical composition, structure, morphology, magnetic, optical and crystallographic properties of the FePt3 NPs were examined using high resolution transmission electron microscopy, high-angle annular dark field-scanning transmission electron microscopy, scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy mapping, Fourier transform infrared-attenuated total reflection, X-ray powder diffraction, X-ray photoelectron spectroscopy, vibrating sample magnetometry and UV–Vis absorption spectroscopy.

Assessing the Chemical Stability and Cytotoxicity of Electrodeposited Magnetic Mesoporous Fe–Pt Films for Biomedical Applications

“…Although the magnetization curves of Fe–Pt deposits at room temperature exhibited superparamagnetic behavior, at 5 K they showed low H c of only ∼630–690 Oe for all of the deposits (Figure b). The amount of H c increased with the increase in Fe content, while the M s value of mesoporous Fe–Pt was ∼35 emu g –1 . ,, Beyond that, the value of M s increased slightly with the increase in Fe content. The magnetic properties of mesoporous Fe–Pt films were thus found to be adequate for biomedical applications.…”

“…The principal diffraction peaks attributed to the mesoporous Fe–Pt films appeared at 2θ = 40.3, 46.8, 68.4, and 81.3°, which aligned neatly with the (111), (200), (220), and (311) planes, respectively, of the disordered fcc Fe–Pt 3 phase with the space group Fm̅ 3 m (ICDD ref no. 001-089-2050). , However, other tiny peaks, all unassigned, were also observable in all of the samples. It should be noted that regardless of composition, all deposits have the same crystal structure.…”

“…The principal diffraction peaks ). 54,55 However, other tiny peaks, all unassigned, were also observable in all of the samples. It should be noted that regardless of composition, all deposits have the same crystal structure.…”

“…The amount of H c increased with the increase in Fe content, while the M s value of mesoporous Fe− Pt was ∼35 emu g −1 . 40,42,55 Beyond that, the value of M s increased slightly with the increase in Fe content. The magnetic properties of mesoporous Fe−Pt films were thus found to be adequate for biomedical applications.…”