Synthesis of plasmonic Fe/Al nanoparticles in ionic liquids

Alexa Schmitz; Hajo Meyer; Michael Meischein; Alba Garzón Manjón; Laura Schmolke; Beatriz Giesen; Carsten Schlüsener; Paul Simon; Yuri Grin; Roland A. Fischer; Christina Scheu; Alfred Ludwig; Christoph Janiak

doi:10.1039/D0RA01111H

Synthesis of plasmonic Fe/Al nanoparticles in ionic liquids†

Alexa Schmitz,

^a Hajo Meyer,^b Michael Meischein,^b Alba Garzón Manjón,

^c Laura Schmolke,^a Beatriz Giesen,

^a Carsten Schlüsener,^a Paul Simon,^d Yuri Grin,^d Roland A. Fischer,

^e Christina Scheu,

^c Alfred Ludwig

^b and Christoph Janiak

*^a

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* Corresponding authors

^a Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany
E-mail: janiak@uni-duesseldorf.de
Fax: +49-211-81-12287
Tel: +49-211-81-12286

^b Materials Discovery and Interfaces, Institut für Werkstoffe, Fakultät für Maschinenbau, Ruhr-Universität Bochum, Universitätsstr. 150, D-44801 Bochum, Germany

^c Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, D-40237 Düsseldorf, Germany

^d Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, D-01187 Dresden, Germany

^e Department of Chemistry, Technische Universität München, D-85748 Garching, Germany

Abstract

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.

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Synthesis of plasmonic Fe/Al nanoparticles in ionic liquids†

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Synthesis of plasmonic Fe/Al nanoparticles in ionic liquids

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