Synthesis and luminescent properties of multifunctional Ag@Fe3O4@Gd2O3Eu3+ composite
| Autor: | Octavio Meza E, Karely Chamé F, Miguel Ojeda M, Federico González G, Celso Velásquez O, Ma. Luisa Ojeda M |
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| Rok vydání: | 2017 |
| Předmět: |
Nanostructure
Chemical substance Quenching (fluorescence) Materials science Mechanical Engineering Composite number Metals and Alloys Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention symbols.namesake Chemical engineering Magazine Mechanics of Materials law Materials Chemistry symbols 0210 nano-technology Luminescence Raman spectroscopy Chemical composition |
| Zdroj: | Journal of Alloys and Compounds. 704:212-217 |
| ISSN: | 0925-8388 |
| Popis: | In this work, the synthesis of Ag@Fe 3 O 4 @Gd 2 O 3 :Eu 3+ composites based on the addition of Gd 2 O 3 with different concentrations of Eu 3+ to Ag@Fe 3 O 4 core-shell composites was performed with the aim of attaining multifunctional composites endowed with a combination of properties such as magnetic (Fe 3 O 4 ) and luminescent (Gd 2 O 3 :Eu 3+ ) together with the addition of the antimicrobial effect of AgNPs. The morphology and chemical composition of the synthesized composites were investigated by techniques such as SEM, FT-IR, Raman, XRD and luminescence, the results showed that the composites present a change from the Ag@Fe 3 O 4 spherical shape to rice-like morphology with the cover of Gd 2 O 3 :Eu 3+ . We have also found that the deposition of AgNPs on the composites produces an increment in the Raman signal. However, we observed a decrement in the luminescent intensity due to a quenching effect which could be attributed to an energy transfer from Eu 3+ ions to AgNPs. Finally, a comparison of the average lifetime of the nanostructures with different amounts of Eu 3+ has been performed, thus finding an increment of the average lifetime after decreasing the Eu 3+ composition. |
| Databáze: | OpenAIRE |
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