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Novel growth mode of solid–liquid–solid (SLS) silica nanowires

Published online by Cambridge University Press:  23 June 2011

Jae Ho Lee ,
Michael A. Carpenter  and
Robert E. Geer
Jae Ho Lee
Affiliation:
College of Nanoscale Science and Engineering, University at Albany—State University of New York, Albany, New York 12205
Michael A. Carpenter
Affiliation:
College of Nanoscale Science and Engineering, University at Albany—State University of New York, Albany, New York 12205
Robert E. Geer*
Affiliation:
College of Nanoscale Science and Engineering, University at Albany—State University of New York, Albany, New York 12205
*
a)Address all correspondence to this author. e-mail: RGeer@uamail.albany.edu
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Abstract

A novel and previously unreported, high temperature solid–liquid–solid (SLS) silica nanowire (NW) growth mode has been observed and investigated. In this mode, SLS NW nucleation and subsequent growth was uniquely promoted by—and coupled to—the formation of thermally etched pyramidal pits in the Si substrate that formed during a high temperature anneal phase before the onset of SLS NW formation. The silicon oxide-mediated thermal pit formation process enhanced Si transport to Au–Si alloy droplets directly adjacent to the pyramidal pits. Consequently, SLS NW nucleation and growth was preferentially promoted at the pit edges. The promotion of SLS NW growth by the pyramidal pits resulted in the observation of SLS NW “blooms” at the pit locations. Subsequent NW growth, occurring both at the pit sites and from Au–Si alloy droplets distributed across the planar surfaces of the Si wafer, eventually occluded the pits. This newly observed process is termed as “thermal pit-assisted growth.”

Keywords

NanostructureSelf-assemblyNucleation and growth
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 17: Focus Issue: Nanowires: Fundamentals and Applications , 14 September 2011 , pp. 2232 - 2239
Copyright
Copyright © Materials Research Society 2011

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