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31	Developing an approach to improve beta-phase properties in ferroelectric pvd-hfp thin films Dale, Ashley S. 05 1900 (has links) Indiana University-Purdue University Indianapolis (IUPUI) / Improved fabrication of poly(vinylindenefluoride)-hexafluoropropylene (PVDF-HFP) thin films is of particular interest due to the high electric coercivity found in the beta-phase structure of the thin film. We show that it is possible to obtain high-quality, beta-phase dominant PVDF-HFP thin films using a direct approach to Langmuir-Blodgett deposition without the use of annealing or additives. To improve sample quality, an automated Langmuir-Blodgett thin film deposition system was developed; a custom dipping trough was fabricated, a sample dipping mechanism was designed and constructed, and the system was automated using custom LabVIEW software. Samples were fabricated in the form of ferroelectric capacitors on substrates of glass and silicon, and implement a unique step design with a bottom electrode of copper with an aluminum wetting layer and a top electrode of gold with an aluminum wetting layer. Samples were then characterized using a custom ferroelectric measurement program implemented in LabVIEW with a Keithley picoammeter/voltage supply to confirm electric coercivity properties. Further characterization using scanning electron microscopy and atomic force microscopy confirmed the improvement in thin film fabrication over previous methods. beta phase Polyvinylidene Fluoride hexafluoropropylene Langmuir Blodgett Langmuir Blodgett method Thin film formation Thin dilm Ferroelectric Thin film characterization Polymer Physics Condensed matter Hysteresis LabVIEW program Arduino Arduino Uno microcontroller PVDF PVDF-HFP Ferroelectric capacitor Ferroelectric capacitors Magnetron sputtering Coercivity Scanning electron microscopy Atomic force microscopy
32	Water Quality Device : Testing Through Electronic Measurements / Water Quality Device : Testing Through Electronic Measurements Adnan Abdu, Jihad, Lundström, Philip January 2023 (has links) Water is the source of all life, but unfortunately, the water quality is getting only worse due to many factors like overuse, contamination, indifference and even by nature itself. By identifying the problem, we are one step closer to solving the problem, and that is why an intelligent water quality device is required to examine water and detect impurities within it. In this project, we are developing a device that uses an entirely new method to measure water quality. Even though the theory behind the device is very advanced, the device is still primitive in its functions and needs development to increase the usefulness and accuracy of the measurements! / Vatten är grunden till allt liv, men tyvärr blir vattenkvaliteten bara sämre på grund av många faktorer som överanvändning, förorening, likgiltighet och till och med av naturen själv. Genom att identifiera problemet är vi ett steg närmare att lösa problemet, och detta är därför en intelligent vattenkvalitetsenhet behövs för att undersöka vattnet och hitta orenheter i det. I detta projekt utvecklar vi en apparat som använder en helt ny metod för att mäta vattenkvaliteten. Även om teorin bakom apparaten är väldigt avancerad så är apparaten fortfarande primitiv i sina funktioner och behöver utveckling för att öka användbarheten och noggrannheten i mätningarna! Water Quality Water Electronics Physics Embedded Systems Pollution Water Pollution Water Quality Device Arduino Uno Rev3 Vattenkvalitet Förorening Vatten Vattenförorening Embedded Systems Inbäddad systemteknik Annan elektroteknik och elektronik Nano Technology Nanoteknik Physical Sciences Fysik Annan geovetenskap och miljövetenskap

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Developing an approach to improve beta-phase properties in ferroelectric pvd-hfp thin films

Water Quality Device : Testing Through Electronic Measurements / Water Quality Device : Testing Through Electronic Measurements