Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 11, Issue 43, Pages 10175-10179Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b912571j
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Funding
- Bundesamt fur Berufsbildung und Technologie (NMPP-N) [8074.1]
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We have developed a simple method for the preparation of nearly mono-dispersed stable gold colloids with a fairly high concentration using a two step procedure. First we synthesize citrate capped gold nanoparticles and then exchange the citrate ions with triethyleneglycolmono-11-mercaptoundecylether (EGMUDE). This leads to the immediate precipitation and formation of composite assemblies. The gold nanoparticles were successfully self-redispersed after a few days. The prepared gold colloid can be easily concentrated up to 20 times by separation of the flocculated part. UV-visible spectra, transmission electron microscopy (TEM), and dynamic light scattering (DLS) were used to characterize the products thus formed.
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