Browsing by Author "Um, Joseph"

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    Template-Assisted Electrodeposited Nanowires and Their Applications
    (2021-06) Um, Joseph
    Nanowires (NWs), cylindrical-shaped nanostructures with nanometer-scale diameters and nano- and micrometer-scale lengths, have gathered great attention from a variety of fields for their unique material properties coming from their high length to diameter ratios, high surface to volume ratios, and nanometer-sized features. In addition, as the demand for increasingly smaller electronic devices grows, the production of small circuits will also be required. In achieving this and accelerating the advancement of electronics, NW-based designs have great potential as a field. NWs can be fabricated via template-assisted electrochemical deposition with adjustable diameters and lengths, allowing them to have special properties for specific applications. Template-assisted electrodeposition is a relatively simple, efficient, convenient, and cost-effective technique to make nanomaterials and nanodevices, compared to lithographic techniques, since it is fast and does not require any special equipment. The templates used in this dissertation are mainly nanoporous anodic aluminum oxide (AAO). AAO templates can also directly affect the properties or performance of nanomaterials and nanodevices made from them due to their structural features. In this dissertation, fabrication processes of AAO and NWs, application-driven magnetic properties of magnetic NWs, and several NW-based applications (e.g., magnetic NW biolabeling system by ferromagnetic resonance, AAO and NW fabrication for 3-D memory, NW-based interconnects) are explored. This research shows how NWs were fabricated, engineered, applied, and analyzed. In particular, for the magnetic NW biolabeling system, ferromagnetic resonance identification (FMR-ID) was developed and optimized. This magnetic NW-based FMR-ID labeling system appears to be effective wherever small identification markers are needed. Also, for future 3-D memory, simple and cost-effective double imprinting method for AAO with ordered pores and uniform Fe/Au multilayered NWs were investigated. Methods to grow NWs using small pore AAO templates and to characterize the NW array embedded in the AAO using scanning electron microscopy were also covered. Furthermore, for NW-based interconnects as the next-generation interconnects lowering power loss and RC delays, a method to integrate AAO on Si was studied and the electrical resistivity of Cu NWs in AAO on Si was estimated via DC resistance measurement. A trend of the experimental Cu NW resistivity with diameter size was introduced as well. The proven applications of nanowires in this research show the potential of nanowires as the essential materials in future nanotechnology.