Journal
LANGMUIR
Volume 26, Issue 10, Pages 7410-7417Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la100591h
Keywords
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Funding
- JSPS [OISE-0914144]
- Rensselaer Polytechnic Institute's (RPI
- National Science Foundation
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We report a fast and highly reproducible chemical synthesis method for colloidal gold nanoparticles which are negatively charged in nonpolar solvents and coated with hydrophobic organic molecules. If a hexane droplet containing charged gold nanoparticles is mixed with a larger toluene droplet, nanoparticles immediately float to the air toluene interface and form a close-packed monolayer film. After evaporation of the solvent molecules, the monolayer film of nanoparticles can be deposited to any substrate without any limit in size. The synthesis does not require a postsynthesis cleaning step, since the two immiscible liquid phases separate the reaction byproducts from gold nanoparticles and a minimal amount of coating molecules is used.
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