Tuning the performance of magnetic, semiconductor, and multifunctional hybrid nanostructures
[eng] The aim of this Ph.D. thesis is the synthesis and characterization of nanoparticles to understand and optimize their macroscopic properties. The manuscript is divided into seven chapters. Chapter 1 is a general introduction to nanoscience and nanotechnology and the synthesis of nanoparticles....
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/185944 |
| Acceso en línea: | https://hdl.handle.net/2445/185944 http://hdl.handle.net/10803/674312 |
| Access Level: | acceso abierto |
| Palabra clave: | Nanopartícules Magnetisme Semiconductors Nanoparticles Magnetism |
| Sumario: | [eng] The aim of this Ph.D. thesis is the synthesis and characterization of nanoparticles to understand and optimize their macroscopic properties. The manuscript is divided into seven chapters. Chapter 1 is a general introduction to nanoscience and nanotechnology and the synthesis of nanoparticles. Also, it includes a brief introduction to the properties of the magnetic, semiconductor, and plasmonic nanoparticles and their potential applications in the nanoscale. At the end of this chapter, the objectives of this work are presented. Chapter 2 is devoted to briefly introducing the characterization techniques used in this thesis such as transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma optical emission spectroscopy, Fourier transform infrared spectroscopy, SQUID magnetometry, and ultraviolet-visible spectroscopy. In addition, experimental details for each technique are included. Chapter 3 is dedicated to the optimization of the synthesis of iron oxide nanoparticles through the thermal decomposition method. In particular, it is focused on the monitoring of the effects on the structural and magnetic properties induced by the changes on the amount of 1,2-hexadecanediol and 1-octadecene, which were used as stabilizing agent and solvent, respectively. Chapter 4 is focused on a thorough structural characterization of multi-core iron oxide nanoparticles to understand their outstanding magnetic properties. In Chapter 5, the optimization of the synthesis by hot injection of Bi2S3 nanoparticles is presented. In this section, the effect of the reaction temperature and time on the morphology and crystallinity of the samples was studied. In addition, their effect on the optoelectronic properties was analyzed using ultraviolet-visible spectroscopy. Chapter 6 is devoted to the combination of semiconductor Bi2S3 nanoparticles with plasmonic Au nanoparticles in order to achieve multifunctional hybrid nanostructures. In this chapter, a similar synthesis procedure to the one used in Chapter 5 with an additional step to include the Au precursor, was used. Also, the effect of the morphology of the semiconductor Bi2S3 scaffold was studied. Finally, the last chapter Chapter 7 is the collection of the major remarks of the previous chapters to conclude all the work performed in this thesis. |
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