| Autor: |
Cottancin, E., Camus, E., Ramade, J., Lebeault, M.A., Langlois, C., Piccolo, L., Hillenkamp, M., Calvo, F., Pellarin, M. |
| Přispěvatelé: |
IRCELYON, ProductionsScientifiques |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Popis: |
The Localized Surface Plasmon resonance (LSPR) of metallic nanoparticles (NPs) is strongly dependent on their local environment and on their constituent-material dielectric functions. Thus, chemical modifications occurring at their vicinity, or directly within the NPs may be optically monitored. Moreover, Ag-based NPs may display a well-defined LSPR strongly sensitive to small variations of the surrounding. In this respect, Ag-based NPs (produced by laser vaporization) containing another reactive metal have been investigated. The first illustration deals with iron-silver NPs investigated through TEM observations, in situ optical spectroscopy and Monte Carlo simulations, leading us to conclude that iron and silver initially adopt a segregated configuration with a silver-enriched surface. During oxidation, iron likely diffuses throughout the silver shell, leading to an Ag@Fe3O4 configuration, while an inverse process may occur during annealing under a reducing atmosphere [1].We also performed optical and environmental TEM characterizations on In-Ag NPs. Optical spectra show LSPRs in the UV range down to 310 nm for as prepared NPs. A NP deposition at elevated temperatures even results in an LSPR |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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