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Downsizing of single crystalline high aspect ratio tungsten nanowires
Author(s) -
Milenkovic Srdjan,
Drensler Stefanie,
Hassel Achim Walter
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431940
Subject(s) - eutectic system , materials science , nanowire , tungsten , directional solidification , temperature gradient , microstructure , halogen lamp , composite material , optoelectronics , metallurgy , optics , physics , quantum mechanics
Directional solidification of eutectic NiAl–W alloys offers an intuitive method to produce tungsten nanowires. Through the use of two different methods, the well‐established Bridgman method and a newer type floating zone method, the direct influence of process parameters, like the withdrawal rate and the temperature gradient, onto the sample microstructure were studied. The sharp temperature gradient, built up using a four mirror system focusing the light emitted by halogen lamps inside the optical floating zone furnace allows producing nanowires with a diameter as small as 75 nm. Differences in the solid/liquid interface morphology depending on the solidification method used are discussed.