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Formation of metastable liquid catalyst during subeutectic growth of germanium nanowires.

Gamalski, AD and Tersoff, J and Sharma, R and Ducati, C and Hofmann, S (2010) Formation of metastable liquid catalyst during subeutectic growth of germanium nanowires. Nano Lett, 10. pp. 2972-2976.

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Abstract

Lattice-resolved, video-rate environmental transmission electron microscopy shows the formation of a liquid Au-Ge layer on sub-30-nm Au catalyst crystals and the transition of this two-phase Au-Ge/Au coexistence to a completely liquid Au-Ge droplet during isothermal digermane exposure at temperatures far below the bulk Au-Ge eutectic temperature. Upon Ge crystal nucleation and subsequent Ge nanowire growth, the catalyst either recrystallizes or remains liquid, apparently stabilized by the Ge supersaturation. We argue that there is a large energy barrier to nucleate diamond-cubic Ge, but not to nucleate the Au-Ge liquid. As a result, the system follows the more kinetically accessible path, forming a liquid even at 240 degrees C, although there is no liquid along the most thermodynamically favorable path below 360 degrees C.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:23
Last Modified: 21 Apr 2014 01:09
DOI: 10.1021/nl101349e

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