Preparation of stable suspensions of gold nanoparticles in water by sonoelectrochemistry.
Stable suspensions of gold nanoparticles in water were prepared with high yield by a novel one-step ultrasound assisted electrochemical process. Various strategies based on the addition of either tailor-made polymers or mixtures of commercially available polymers, in the electrochemical bath have been found successful to avoid nanoparticles aggregation commonly observed by sonoelectrochemistry. alpha-Methoxy-omega-mercapto-poly(ethylene oxide) or poly(vinyl pyrrolidone)/polyethylene oxide mixtures were able to build up a coalescence barrier around the gold nanoparticles. The results showed that the size of the gold nanoparticles could be easily tuned between 5 nm and 35 nm by simple control of the electrochemical parameters, i.e. the deposition time (T(ON)) from 10 ms to 20 ms. The properties of as-prepared gold nanoparticles were compared to the ones of gold colloids prepared by the more conventional wet nanoprecipitation method using chemical reductive agents.
Aqil
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Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium.
Serwas
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H
Delplancke
J L
JL
Jérôme
R
R
Jérôme
C
C
Canet
L
L
D001894:Borohydrides / Q000737:chemistry; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry*; D008024:Ligands; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011205:Povidone / Q000737:chemistry; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet; D013535:Suspensions; D014465:Ultrasonics; D014867:Water
D001894:Borohydrides; D008024:Ligands; D012997:Solvents; D013535:Suspensions; D014867:Water; D011092:Polyethylene Glycols; D006046:Gold; C028210:monomethoxypolyethylene glycol; D011205:Povidone