Controlling the amorphous and crystalline state of multinary alloy nanoparticles in an ionic liquid

Garzón-Manjón, A. and Meyer, H. and Grochla, D. and Löffler, T. and Schuhmann, W. and Ludwig, Al. and Scheu, C.

Volume: 8 Pages:
DOI: 10.3390/nano8110903
Published: 2018

Controlling the amorphous or crystalline state of multinary Cr-Mn-Fe-Co-Ni alloy nanoparticles with sizes in the range between ~1.7 and ~4.8 nm is achieved using three processing routes. Direct current sputtering from an alloy target in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide leads to amorphous nanoparticles as observed by high-resolution transmission electron microscopy. Crystalline nanoparticles can be achieved in situ in a transmission electron microscope by exposure to an electron beam, ex situ by heating in vacuum, or directly during synthesis by using a high-power impulse magnetron sputtering process. Growth of the nanoparticles with respect to the amorphous particles was observed. Furthermore, the crystal structure can be manipulated by the processing conditions. For example, a body-centered cubic structure is formed during in situ electron beam crystallization while longer ex situ annealing induces a face-centered cubic structure. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.

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