Metastable Crystalline AuGe Catalysts Formed During Isothermal Germanium Nanowire Growth
Physical Review Letters
American Physical Society
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Gamalski, A., Tersoff, J., Sharma, R., Ducati, C., & Hofmann, S. (2012). Metastable Crystalline AuGe Catalysts Formed During Isothermal Germanium Nanowire Growth. Physical Review Letters, 108 (255702)https://doi.org/10.1103/PhysRevLett.108.255702
We observe the formation of metastable AuGe phases without quenching, during strictly isothermal nucleation and growth of Ge nanowires, using video-rate lattice-resolved environmental transmission electron microscopy. We explain the unexpected formation of these phases through a novel pathway involving large and abrupt variations in composition rather than temperature. The metastable catalyst has important implications for nanowire growth; and more broadly, the isothermal process provides both a new approach to growing and studying metastable phases, and a new perspective on their formation.
A. D. G. acknowledges funding from the Marshall Aid Commemoration Commission and the National Science Foundation. S. H. and C. D. acknowledge funding from the Royal Society. S. H. acknowledges funding from ERC grant InsituNANO (n°279342).
European Research Council (279342)
External DOI: https://doi.org/10.1103/PhysRevLett.108.255702
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246861