Tesis y Trabajos de Investigación PUCP

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Construction and implementation of a 4-probe measuring system to determinate the temperature dependent sheet resistance of thin films
(Pontificia Universidad Católica del Perú, 2017-04-12) Pacheco Arenas, Carlos Arturo; Ströhla, Tom; Rumiche Zapata, Francisco Aurelio
In order to build machines, electronic devices, it is necessary to know all properties of the materials. The machines and electronic devices use parts that are interconnected, the mechanical properties are important, but for some specific tasks the electrical properties are more important. In this sense it is necessary to predict the behavior of this parts in different temperatures to the environment. The present thesis focus on implementation of a 4-probe measuring system to determinate the sheet resistance of thin film samples showing the dependency of the resistivity on the film thickness as well as on the deposition temperature. The method used to determine the resistivity is the modified van der Pauw Method. Therefore, it is important the measurement of the current and the voltage drop in the sample. It is also important to measure the distance between tips, in order to calculate the resistivity. Furthermore, it is also important to find the correct transformation that maps any four point of a plane to a new plane with four collinear points. The measurements are controlled via LabVIEW and the measured data is displayed in the user interface.
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Investigations on electrical conducting magnetic hybrid materials for sensor and actuator systems
(Pontificia Universidad Católica del Perú, 2016-06-21) Chávez Vega, Jhohan Harvey; Kaufhold, Tobias; Böhm, Valter; Rumiche Zapata, Francisco Aurelio
Scientists and engineers feel motivated in the presence of new elements or materials they cannot comprehend. That is why when a material with a new properties or behavior arises, they do the best to investigate on them until understand them and give some applications. One of these kind of moderns materials are the ferrofluids, which have a special and very different behavior when are induced under magnetic field and when not. These materials have plenty of applications nowadays. Due to their smart behaviour they are used on dampers for automobile suspensions, for measurement of fluid’s viscosities, acoustics and several more tasks. Magneto sensible elastomers (MSE) are materials that own similar properties to ferrofluids, with the substantial difference of being in solid state independently of the presence or absence of magnetic field. MSE are composed on a polymer matrix that has magnetic particles that provide them a smart behaviour under magnetic fields. For this project the magnetic particles were iron powder and certain amounts of graphite were also added to give electrical conductivity. In the current work it was fabricated several samples of MSE to study the behaviour of their electrical and mechanical properties under the effect of a magnetic field. Permanent magnets were used to induce the magnetic field on the probes and this field was changed by moving the magnets away and close to the probes through a motorized positioning machine. The results obtained from the experiments are summarized on conclusions that can be used in future to the design and building of sensors and actuators.

Tesis y Trabajos de Investigación PUCP

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