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.
Highlights
In recent years, bimetallic nanocrystals have received significant attention for nanoengineering, nanoelectronics and nanomedicine because of their physical and chemical properties
Polyol synthesis techniques are based on solvents such as tetraethylene glycol (TEG) and ethylene glycol (EG) which simultaneously serve as solvent and reducing agent for the metallic precursor [23, 33]
The morphology and elemental composition of the F ePt3 NPs were examined by means HAADF-STEM using the Z-contrast
Summary
Bimetallic nanocrystals have received significant attention for nanoengineering, nanoelectronics and nanomedicine because of their physical and chemical properties. Science and Engineering, Chair of Micro‐ and Nanostructure Research and Center for Nanoanalysis and Electron Microscopy, Interdisciplinary Center for Nanostructured Films, Friedrich-Alexander University of Erlangen-Nürnberg, Cauerstr. The most common synthesis routes for preparing FePt, F e3Pt or F ePt3 nanoparticles are the thermal decomposition technique and the polyol synthesis [21, 23]. The formation of FePt alloy nanocrystals depend on the growth from two different metals (Fe and Pt) at distinct reaction temperatures [21]. One major drawback of these demanding synthesis techniques is the impossibility to adjust the growth of FePt alloy nanoparticles within a uniform crystal phase (fcc or fct)
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