Photoinduced Size-Controlled Generation of Silver Nanoparticles Coated with Carboxylate-Derivatized Thioxanthones
Fiche publication
Date publication
juin 2010
Auteurs
Membres identifiés du Cancéropôle Est :
Pr SCHNEIDER Raphaël
Tous les auteurs :
Malval JP, Jin M, Balan L, Schneider R, Versace DL, Chaumeil H, Defoin A, Soppera O
Lien Pubmed
Résumé
We report a new strategy for a rapid photoinduced synthesis of monodisperse ligand-coated silver nanoparticles. Such nanoparticles are produced through a very fast reduction of Ag+ by alpha-aminoalkyl radicals which are first generated from hydrogen abstraction toward an aliphatic amine by the excited triplet state of the 2-substituted thioxanthone series (TX-O-CH2-COO- and TX-S-CH2-COO-). The quantum yield of this prior reaction is tuned by the substituent effect on thioxanthones and leads to a kinetic control of the conversion of Ag+ to Ag(O). Combined with the capping role of a carboxylate function linked to the chromophores, a size regulation of the growing nanoparticles is both promoted and optimized because of a concomitant kinetics adjustment between the photoreduction process and the subsequent functionalization of the nanoparticles. We demonstrate that the optimal adjustment is then obtained with TX-S-CH2-COO-.
Référence
J Phys Chem C. 2010 Jun 17;114(23):10396-402