Estudo das propriedades termo-óticas de nanofluido de CdSe em soluções com nanobastões de Au

• Ano de defesa: 2019
• Autor(a) principal: Fraga, Wellington Gonçalves
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Física
• Palavras-chave em Português: CdSe; Ponto quântico; Nanobastões de ouro; AuNRs; Nanofluidos; Nanopartículas de ouro; Espectroscopia; Lente térmica; CNPQ::CIENCIAS EXATAS E DA TERRA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/27261; http://dx.doi.org/10.14393/ufu.di.2019.2291

In this work a study of the thermo-optical properties of nanofluids of CdSe quantum dots co-doped with gold nanorods as a function of nanoparticle size was carried out. Among the various types of nanoparticles, semiconductor quantum dots and metallic nanorods have received great attention from the scientific community due to the new synthetic routes and the ability to control their optical, electrical, magnetic and thermal properties as a function of their size, geometry and surface. nanomaterials. Such properties make metallic nanoparticles, for example, excellent candidates in the treatment of cancer, image detection, controlled release of the drug. Semiconductor nanoparticles have excellent properties with wide application in the field of photovoltaic devices, photodetectors and biomedical devices. In this sense, the objective of this research was the study of the thermal and optical properties of the interaction resulting from the combination of the two nanomaterials. For the thermo-optical characterization of these materials, the photoluminescence technique and the thermal lens technique were used. The results obtained allowed to observe that the photoluminescence intensity of the quantum dots samples when mixed with gold nanorods are dependent on the length of the nanorods. Using the thermal lens technique, it was possible to observe the thermal diffusivity behavior of the quantum dots of CdSe and nanorods, as well as the mixing of the two materials. It was verified that with the increase of the diameter of the quantum point the values of the diffusivity decreased, whereas the nanofluids with nanorods presented constant values. When the materials were mixed, we obtained higher values in comparison to the samples with only quantum point, according to the values found for the nanorods. Finally, the results obtained in this work extend the discussion about the study of the thermo-optical properties of nanoparticles of quantum point and nanorods, which is of great importance for applications mainly in the biomedical areas and study of the transfer of energy in electromechanical. optical devices.