Produção e caracterização de nanopartículas de Terfenol-D
This work presents the experimental results gathered in the synthesis and characterization of nanoparticles from a metallic alloy composed by Iron, Dysprosium and Terbium, TbxDy1-xFe2, also known as Terfenol-D. The nanoparticles were produced through Laser Ablation Synthesis in Solution (LASiS). The...
| Autor principal: | Nadas, Rafael Battistella |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2019
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/4306 |
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| Resumo: |
This work presents the experimental results gathered in the synthesis and characterization of nanoparticles from a metallic alloy composed by Iron, Dysprosium and Terbium, TbxDy1-xFe2, also known as Terfenol-D. The nanoparticles were produced through Laser Ablation Synthesis in Solution (LASiS). The shape and size of these nanoparticles were determined via transmission and scanning electron microscopy, as well as via Dynamic Light Scattering (DLS). The results of the microscopy and DLS show that the nanoparticles present spherical shape and average size of 17nm (ranging from 1 to 150 nm). The composition and crystal structure of the nanoparticles were determined through Energy Dispersive X-Ray Spectroscopy (EDS) and Selected Area Electron Diffraction (SAED). EDS pointed to the presence of three elements of the alloy: Fe, Dy and Tb; SAED showed that the interplanar distances are comparable to the ones found in the literature. The synthesized nanoparticles were used to produce SERS substrates in order to identify a reduced number of Proline, Urea and Glycine molecules. The effect of the presence of a magnetic field during the deposition of the colloid over the substrate showed that the produced films are more homogeneous and uniform than the films produced without the aid of a magnet: the heights root mean square of the films vary from (79,57 ± 0,01) nm for films produced without magnetic field and (47,69 ± 0,01) nm for films produced with a magnet. These results indicate that Terfenol-D is a promising SERS agent that can be used in the future for the development of biosensors. |
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