Please use this identifier to cite or link to this item:
Title: Gradual transformation of Ag2S to Au2S nanoparticles by sequential cation exchange reactions: binary, ternary, and hybrid compositions
Author: Dalmases Solé, Mariona
Torruella Besa, Pau
Blanco-Portals, J.
Vidal, Albert
Lopez-Haro, Miguel
Calvino, José Juan
Estradé Albiol, Sònia
Peiró Martínez, Francisca
Figuerola i Silvestre, Albert
Keywords: Nanopartícules
Issue Date: 11-Sep-2018
Publisher: American Chemical Society
Abstract: Cation exchange reactions have been exploited in the last years as an efficient tool for the controlled chemical modi-fication of pre-made nanocrystals. In this work, the gradual transformation of Ag2S nanocrystals into Au2S analogues is performed by sequential cation exchange reactions that allow for a fine control of the chemical composition, delivering also two intermediate ternary sulfides based exclusively on noble metals. The role of two different surfactants in the reaction medium has been studied: while dodecylamine is favoring the heterogeneous nucleation of metallic Au on the surface of the semiconductor domains in detri-ment of the cation exchange reaction, the use of tetraoctylammonium bromide turns out to be crucial for the enhancement of the exchange in order to reach full cation substitution, if desired. The presence of Br- anions in the reaction medium represents an additional tool to modulate the morphology of the final nanocrystals, being either solid or hollow depending on their concentration. The synthetic protocol has been successfully conducted in both spherical and rod-like nanocrystals with identical results, leading to a wide variety of binary, ternary and/or hybrid nanostructures that have been carefully characterized.
Note: Versió postprint del document publicat a:
It is part of: Chemistry of Materials, 2018, vol. 30, num. 19, p. 6893-6902
Related resource:
ISSN: 0897-4756
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Química Inorgànica i Orgànica)

Files in This Item:
File Description SizeFormat 
682630.pdf1.22 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.