Shape-Controlled Au Particles for InAs Nanowire Growth

We present a study of InAs nanowire (NW) growth with shape-controlled Au seed particles. In comparison to more conventional spherical particles, the highly faceted, shaped Au particles are found to enhance the initial growth kinetics of InAs NWs at identical growth conditions. Analysis of the NWs af...

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Bibliographic Details
Published in:Nano letters 2012-01, Vol.12 (1), p.315-320
Main Authors: Lin, Pin Ann, Liang, Dong, Reeves, Samantha, Gao, Xuan P.A, Sankaran, R. Mohan
Format: Article
Language:English
Subjects:
Arsenicals - chemistry
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystallization - methods
Diffusion
Droplets
Exact sciences and technology
Gold
Gold - chemistry
Indium - chemistry
Indium arsenides
Lead (metal)
Liquefaction
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Macromolecular Substances - chemistry
Materials science
Materials Testing
Molecular Conformation
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanowires
Particle Size
Physics
Quantum wires
Seeds
Solid surfaces and solid-solid interfaces
Surface chemistry
Surface Properties
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:We present a study of InAs nanowire (NW) growth with shape-controlled Au seed particles. In comparison to more conventional spherical particles, the highly faceted, shaped Au particles are found to enhance the initial growth kinetics of InAs NWs at identical growth conditions. Analysis of the NWs after growth by transmission electron microscopy and energy-dispersive spectroscopy suggests that while In diffuses into the bulk of the shaped Au particles, in accordance with the vapor–liquid–solid (VLS) growth mechanism, the surface faceting is preserved. A key difference is that the shaped Au particles are characterized by a thicker In shell on their surfaces than the spherical Au particles, indicating that increased adsorption of In leads to the observed growth rate enhancement. On the basis of these results, we propose that our picture of VLS growth in regards to liquefaction and droplet formation is incomplete and that the initial particle morphology can be used to tailor NW growth.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl2036035