Stabilization and size control of gold nanoparticles during laser ablation in aqueous cyclodextrins.
Femtosecond laser radiation has been used to ablate a gold target in aqueous beta-cyclodextrin (CD) solutions to produce stable gold nanoparticle colloids with extremely small size (2 to 2.4 nm) and size dispersion (1 to 1.5 nm). On the basis of XPS and zeta-potential measurements, we propose a model involving chemical interactions between the gold and the CDs. The model includes both the hydrophobic interaction of the Au0 with the interior cavity of the CD and the hydrogen bonding of O- groups on the partially oxidized gold surface with -OH groups of the CDs.
Sylvestre
Jean-Philippe
JP
Laser Processing Laboratory, Department of Engineering Physics, Ecole Polytechnique de Montréal, Case Postale 6079, succ. Centre-Ville, Montréal, Québec, Canada, H3C 3A7.
Kabashin
Andrei V
AV
Sacher
Edward
E
Meunier
Michel
M
Luong
John H T
JH
D003505:Cyclodextrins / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007834:Lasers; D036103:Nanotechnology
D003505:Cyclodextrins; D006046:Gold