Controlling the Amorphous and Crystalline State of Multinary Alloy Nanoparticles in An Ionic Liquid

Autor: Alfred Ludwig, Wolfgang Schuhmann, Tobias Löffler, Alba Garzón-Manjón, Christina Scheu, Dario Grochla, Hajo Meyer
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Nanomaterials
Volume 8
Issue 11
Nanomaterials, Vol 8, Iss 11, p 903 (2018)
ISSN: 2079-4991
DOI: 10.3390/nano8110903
Popis: Controlling the amorphous or crystalline state of multinary Cr-Mn-Fe-Co-Ni alloy nanoparticles with sizes in the range between ~1.7 nm 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.
Databáze: OpenAIRE