Table 1.
Compositions and sizes of FePt NPs synthesized at different Fe/Pt ratios and surface coatings
| Sample | Precursors and molar ratio | Capping agent | Fe/Pt molar ratio | Composition (FexPt100−x)c | Diameter (nm) | ||
|---|---|---|---|---|---|---|---|
|
| |||||||
| XRDd | TEMe | ||||||
| 1a | Fe(acac)3/Pt(acac)2 | 3:1 | OA/OA | 60:40 | Fe60Pt40-OA/OA | 5.8 | 4.3 ± 0.5 |
| 2a | 1:1 | 45:55 | Fe45Pt55-OA/OA | 7.7 | 7.1 ± 0.9 | ||
| 3a | 1:3 | 27:73 | Fe27Pt73-OA/OA | 5.6 | 3.6 ± 0.4 | ||
| 4b | FeCl2/K2PtCl6 | 1:1 | Cys | 60:40 | Fe60Pt40-Cys | 4.6 | 3.1 ± 0.4 |
| 5b | 1:3 | 24:76 | Fe24Pt76-Cys | 4.2 | 3.4 ± 0.3 | ||
Notes:
a
Samples were synthesized using a polyol reduction route under refluxing temperature;
b
samples were synthesized using NaBH4 as the reductant at room temperature;
c
in context, FePt NPs with different surface coatings were denoted as FexPt100−x-OA/OA NPs or FexPt100−x-Cys NPs for convenience;
d
sizes of NPs were calculated from XRD patterns according to the Debye–Scherrer formula;
e
sizes of NPs were obtained from TEM images.
Abbreviations: NPs, nanoparticles; OA/OA, oleic acid/oleylamine; Cys, cysteine; XRD, X-ray diffraction; TEM, transmission electron microscopy.