Au-Induced Encapsulation of Ge Nanowires in Protective C Shells


  • This work was performed under the auspices of the U.S. Department of Energy, under contract No. DE-AC02-98CH1-886.


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In situ annealing experiments (in the temperature range between room temperature and 400 °C) in a transmission electron microscope show that Ge nanowires can be encapsulated in graphitic C shells in the presence of C (see figure) if the wire surface is decorated with small amounts of Au. The C shells are demonstrated to provide a protective barrier against nanowire oxidation even after prolonged exposure to ambient conditions.