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.
Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium.
A
A
Aqil
H
H
Serwas
J L
JL
Delplancke
R
R
Jérôme
C
C
Jérôme
L
L
Canet
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