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Monolayer Film of Gold Nanoparticles on a 3 inch or Larger Silicon Wafer

Published online by Cambridge University Press:  15 March 2011

Matthew N. Martin  and
Sang-Kee Eah
Matthew N. Martin
Affiliation:
Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A.
Sang-Kee Eah
Affiliation:
Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A.
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Abstract

We chemically synthesized charged gold nanoparticles coated with hydrophobic organic molecules, which are stable in hexane but unstable in toluene. If a hexane droplet with charged gold nanoparticles is mixed with a larger toluene droplet, they immediately float to the airtoluene interface forming a monolayer of close-packed gold nanoparticles. The monolayer can be deposited to any substrate simply by the solvent molecules' evaporation with no limit in size and without using any sophisticated instrument. As a demonstration, we fabricated a very large monolayer of close-packed gold nanoparticles covering the whole surface of a 3 inch silicon wafer. We further showed that excess organic ligand molecules do not affect the charged gold nanoparticles' property of floating to and forming a monolayer at the air-toluene interface. However, these very slowly evaporating molecules remain on a substrate, affect the two-dimensional ordering, and significantly reduce the contrast in scanning electron microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1113: Symposium F – Low-Cost Solution-Based Deposition of Inorganic Films for Electronic/Photonic Devices , 2008 , 1113-F03-01
Copyright
Copyright © Materials Research Society 2009

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References

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