Ingeniería y Ciencia de los Materiales
URI permanente para esta colecciónhttp://54.81.141.168/handle/123456789/31431
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Ítem Texto completo enlazado Synthesis and characterization of nanostructured ternary MAX-phase thin films prepared by magnetron sputtering as precursors for twodimensional MXenes(Pontificia Universidad Católica del Perú, 2023-03-07) Miranda Marti, Marta; Grieseler, RolfMAX phase thin films can be fabricated through firstly depositing a precursor thin film consisting of the initial elements M, A, and X close to the MAX phase stoichiometry employing physical vapor deposition techniques with a subsequent thermal annealing process. This work presents different deposition configurations (multilayer and co-sputtering) for the fabrication of the Ti2AlC and Ti3AlC2 MAX phase thin films by magnetron sputtering from three elemental targets (Ti, Al, and C). It was found that the depositions followed mainly amorphous thus the MAX phase was not able to form. By implementing the deposition parameters such as temperature and substrate voltage, the deposition morphology could be tailored to crystalline and MAX phases could be created. Moreover, Ti2AlC and Ti3AlC2 nanostructured MAX phase thin films were fabricated by magnetron sputtering with three elemental targets (Ti, Al, and C) at oblique angle, resulting in a columnar thin film, and the properties of the thin film were described as a function of the column tilt angle. Lastly, the MAX phases at normal configuration and at oblique angle configuration were wet etched and the properties of the resulting MXene thin films were analyzed. It was demonstrated that only the surface of the sample was attacked by the etching solution. Thus, only the surface of the MAX phase was transformed into MXene. This hypothesis was verified by multiple characterizations such as e.g., X-Ray Diffraction and Raman spectroscopy to understand the possible morphology and chemical transformation and its influence on the etched thin film properties. The aim of this work is to unravel the connection between the morphology of the MAX phase thin films and the properties of the resulting MXenes. By understanding this relationship, it would be possible to tailor their features for specific applications.Ítem Texto completo enlazado Funcionalización de compositos poliméricos a través de recubrimientos de óxido de zinc dopado con aluminio depositados por pulverización catódica de radio frecuencia(Pontificia Universidad Católica del Perú, 2021-01-21) Sánchez Sifuentes, Ana Cristina Midori; Guerra Torres, Jorge AndrésEn este trabajo de tesis se evalúa la capacidad de depositar películas delgadas de óxido de zinc dopado con aluminio sobre sustratos poliméricos flexibles impresos en 3D. Se presentan los resultados de la caracterización óptica, eléctrica y estructural de las películas delgadas de óxido de zinc dopado con aluminio depositadas sobre sustratos con diferentes niveles de flexibilidad. El objetivo es evaluar la capacidad de la película delgada de mantener sus propiedades electrónicas sobre estos sustratos flexibles incluso después de ser activado térmicamente. Para esto, las muestras son caracterizadas óptica y electrónicamente después de ser activadas a través de tratamientos térmicos de hasta 260°C. Los resultados de las películas con sustrato polimérico se comparan con los de una película depositada sobre sílica fundida. El principal resultado de este estudio sistemático es el comportamiento de la conductividad del óxido de zinc dopado con aluminio en función de la flexibilidad del material del sustrato.