Gradual transformation of Ag2S to Au2S nanoparticles by sequential cation exchange reactions: binary, ternary, and hybrid compositions
| Autor: | Pau Torruella, José J. Calvino, Miguel López-Haro, Francesca Peiró, Albert Figuerola, Sònia Estradé, Albert Vidal, Javier Blanco-Portals, Mariona Dalmases |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
General Chemical Engineering
Nucleation Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Metal chemistry.chemical_compound Materials Chemistry Chemical composition Nanoestructures Nanopartícules Chemistry Chemical modification General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Nanocrystals Nanostructures Nanocrystal Chemical engineering visual_art visual_art.visual_art_medium Nanoparticles Tetraoctylammonium bromide 0210 nano-technology Ternary operation Nanocristalls |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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