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Nanotwinned gold nanowires obtained by chemical synthesis

Bernardi, Marco and Raja, Shilpa N. and Lim, Sung Keun (2010) Nanotwinned gold nanowires obtained by chemical synthesis. Nanotechnology, 21 (28). Art. No. 285607. ISSN 0957-4484. doi:10.1088/0957-4484/21/28/285607.

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We demonstrate a facile method for synthesizing and isolating Au nanowires with a high density of twin boundary defects normal to the growth axis. In this process, oleylamine conveniently plays the role of the solvent, the reducing agent and the ligand. The geometry of the twin boundaries in the nanowires is in sharp contrast with the pentagonal twinning commonly observed in metal nanowires, and is of particular interest for its ultrahigh tensile strength. The nanostructure geometry and twin–twin average spacing were characterized using high-resolution electron microscopy, and the tensile strength of the nanowires was estimated in solution using a Ti ultrasonication probe. We present a model for explaining the role of the bulky ligand oleylamine in the formation of the twin boundaries that could be extended to include elastic terms in the ligand shell. Our work demonstrates that the use of bulky, asymmetric ligands can induce extensive formation of twin boundary defects that in turn control the mechanical properties at the nanoscale.

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Bernardi, Marco0000-0001-7289-9666
Additional Information:© 2010 IOP Publishing. Received 31 March 2010, in final form 23 May 2010, Published 28 June 2010. The authors acknowledge helpful discussions with Dr Francesco Stellacci and Dr Silvija Gradecak of the Department of Materials Science at MIT.
Issue or Number:28
Record Number:CaltechAUTHORS:20150925-124403422
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60531
Deposited By: George Porter
Deposited On:25 Sep 2015 20:25
Last Modified:12 Jul 2022 19:48

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