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Importance of line and interfacial energies during VLS growth of finely stranded silica nanowires

Published online by Cambridge University Press:  13 July 2011

Martin Bettge ,
Scott MacLaren ,
Steve Burdin ,
Daniel Abraham ,
Ivan Petrov ,
Min-Feng Yu  and
Ernie Sammann
Martin Bettge*
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801; and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Scott MacLaren
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Steve Burdin
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Daniel Abraham
Affiliation:
Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439
Ivan Petrov
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Min-Feng Yu
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Ernie Sammann
Affiliation:
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
*
a)Address all correspondence to this author. e-mail: bettge@mrl.uiuc.edu
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Abstract

A rich research history exists for crystalline growth by vapor–liquid–solid (VLS) methods, but not for amorphous growth. Yet VLS growth in the absence of crystallographic influences provides an ideal laboratory for exploring surface energy effects, including the role of line tension. We discuss the growth of amorphous silica nanowires from indium droplets by a modified VLS method. Multiple strands issue from each droplet, each strand having <1% (i.e., < 5 nm) of the radius of the droplet. We analyze the surface forces for this system, including line tension, and combine data in a novel way to estimate the surface energy of silica, the interfacial energy of liquid indium on silica, and the line tension at the three-phase boundary. The results suggest that the growth of these silica strands would be impossible without the presence of a negative line tension that also serves to stabilize the strand radii against perturbation.

Keywords

NanoscaleIon beam processingOxide
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 17: Focus Issue: Nanowires: Fundamentals and Applications , 14 September 2011 , pp. 2247 - 2253
Copyright
Copyright © Materials Research Society 2011

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