Spontaneous formation of silver nanoparticles on the vanadium silicate EVS-10
| Autor: | James A. Sawada, Steven M. Kuznicki, Farnaz Mani |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Inorganic chemistry Vanadium chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Redox Silver nanoparticle Metal chemistry.chemical_compound symbols.namesake X-ray photoelectron spectroscopy General Materials Science General Chemistry Microporous material 021001 nanoscience & nanotechnology Condensed Matter Physics Silicate 0104 chemical sciences chemistry Mechanics of Materials visual_art symbols visual_art.visual_art_medium 0210 nano-technology Raman spectroscopy |
| Zdroj: | Microporous and Mesoporous Materials. 224:208-216 |
| ISSN: | 1387-1811 |
| Popis: | The phenomenon associated with the ion-exchange of silver ions into the microporous vanadosilicate EVS-10 is explored. EVS-10 is a vanadium-substituted form of the titanosilicate ETS-10 and is composed of corner-sharing orthogonal chains of vanadia octahedra which connect through silicate bridges to form pores and channels of molecular dimensions. The anionic charge associated with the vanadia octahedra is offset by mobile and exchangeable cationic counter-ions. It was found that silver replaces sodium quantitatively in EVS-10 and that, unexpectedly, the silver ions are spontaneously reduced to silver metal particles which appear as nano-scale metal clusters in the TEM images. The reduction of the silver ions is accompanied by an oxidation of the framework vanadium and this redox pair is established through XPS and Raman spectroscopy. The mechanism for this unique behaviour is believed to be explained by a galvanic reaction between the incoming Ag + and the framework V 4+ . |
| Databáze: | OpenAIRE |
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