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キーワード:
Aluminum alloys, Electron diffraction, Energy dispersive spectroscopy, Fast Fourier transforms, Ionic liquids, Iron alloys, Metal nanoparticles, Plasmonic nanoparticles, Scanning electron microscopy, Synthesis (chemical), X ray diffraction analysis, X ray photoelectron spectroscopy, Bottom up approach, Bottom-up and top-down, Element compositions, Energy dispersive X ray spectroscopy, High-resolution TEM, Nanoparticle (NPs), Selected area electron diffraction, Top down approaches, High resolution transmission electron microscopy
要旨:
Bottom-up and top-down approaches are described for the challenging synthesis of Fe/Al nanoparticles (NPs) in ionic liquids (ILs) under mild conditions. The crystalline phase and morphology of the metal nanoparticles synthesized in three different ionic liquids were identified by powder X-ray diffractometry (PXRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), selected-area electron diffraction (SAED) and fast Fourier transform (FFT) of high-resolution TEM images. Characterization was completed by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) for the analysis of the element composition of the whole sample consisting of the NPs and the amorphous background. The bottom-up approaches resulted in crystalline FeAl NPs on an amorphous background. The top-down approach revealed small NPs and could be identified as Fe4Al13 NPs which in the IL [OPy][NTf2] yield two absorption bands in the green-blue to green spectral region at 475 and 520 nm which give rise to a complementary red color, akin to appropriate Au NPs. © 2020 The Royal Society of Chemistry.
