Surface Crystallization of Liquid Au-Si and Its Impact on Catalysis.
Gamalski, Andrew D
Reuter, Mark C
Stach, Eric A
Ross, Frances M
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Panciera, F., Tersoff, J., Gamalski, A. D., Reuter, M. C., Zakharov, D., Stach, E. A., Hofmann, S., & et al. (2019). Surface Crystallization of Liquid Au-Si and Its Impact on Catalysis.. Adv Mater, 31 (5), e1806544. https://doi.org/10.1002/adma.201806544
In situ transmission electron microscopy reveals that an atomically thin crystalline phase at the surface of liquid Au-Si is stable over an unexpectedly wide range of conditions. By measuring the surface structure as a function of liquid temperature and composition, a simple thermodynamic model is developed to explain the stability of the ordered phase. The presence of surface ordering plays a key role in the pathway by which the Au-Si eutectic solidifies and also dramatically affects the catalytic properties of the liquid, explaining the anomalously slow growth kinetics of Si nanowires at low temperature. A strategy to control the presence of the surface phase is discussed, using it as a tool in designing strategies for nanostructure growth.
European Research Council (279342)
Engineering and Physical Sciences Research Council (EP/K016636/1)
Engineering and Physical Sciences Research Council (EP/P005152/1)
External DOI: https://doi.org/10.1002/adma.201806544
This record's URL: https://www.repository.cam.ac.uk/handle/1810/287107