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Area-Selective Electroless Deposition of Gold Nanostructures on SiC Using Focused-Ion-Beam Preprocessing

Published online by Cambridge University Press:  06 February 2015

Hiroki Itasaka ,
Masayuki Nishi ,
Masahiro Shimizu  and
Kazuyuki Hirao
Hiroki Itasaka
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
Masayuki Nishi*
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
Masahiro Shimizu
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
Kazuyuki Hirao
Affiliation:
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
*
*Email: [email protected]
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Abstract

Area-selective electroless deposition of gold nanostructures on a 6H-SiC substrate is demonstrated. Gold nanostructures selectively grow on a focused ion beam (FIB)-irradiated area on the 6H-SiC substrate when the substrate is exposed to a pure HAuCl4 aqueous solution. The nucleation of gold was more favorable on the Si face than on the C face. Quantitative evaluation of the amount of gold grown both on SiC and silicon is conducted to discuss the growth of gold, where silicon is a substrate we used in our previous study on this method. We reveal the mechanism of the growth of gold nanostructures as follows: Dangling bond defects formed in the FIB-irradiated area initiate the nucleation of gold by reducing Au ions in the solution at the surface. Once the SiC-gold or the silicon-gold boundary, which meets the Schottky contact condition, has formed, electrons in the non-FIB-irradiated region under/around the FIB-irradiated one also reduce Au ions on the gold surface through the boundary.

Keywords

Aunanostructureelectrochemical synthesis
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1748: Symposium II – Semiconductor Nanocrystals, Plasmonic Metal Nanoparticles, and Metal-Hybrid Structures , 2015 , mrsf14-1748-ii11-02
Copyright
Copyright © Materials Research Society 2015 

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References

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