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

Alba Garzón-ManjónHajo MeyerDario GrochlaTobias LöfflerWolfgang SchuhmannAlfred LudwigChristina Scheu
Published in: Nanomaterials (Basel, Switzerland) (2018)
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.
Keyphrases
  • ionic liquid
  • room temperature
  • electron microscopy
  • crystal structure
  • high resolution
  • photodynamic therapy
  • mass spectrometry
  • metal organic framework