On the advancement of core/shell titanium dioxide nanomaterials for microwave absorption
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Controlling the interactions between incident electromagnetic energy and matter is of critical importance for many civil and military applications, such as photocatalysis, solar cells, optics, radar detection, communications, information processing and transport, et al. For interactions in the microwave region of the electromagnetic spectrum, the generation of materials which have desirable dielectric and magnetic properties is critical, as these properties ultimately determine how a material system interacts with these incident electromagnetic waves. In this dissertation, we present a comprehensive report of the microwave absorption properties of metal/hydrogen treated anatase titanium dioxide nanoparticles, where the synergistic treatment induces favorable structural, optical, and microwave absorption properties, which can be fine-tuned via controlling the temperature of materials treatment. Furthermore, this material demonstrates strong reflection loss and effective bandwidth properties, which places its performance within the top quintile of all materials produced. The high efficiency of microwave absorption is likely linked to the disordering-induced property changes in the materials. Along with the increased microwave absorption properties are largely increased visible-light and IR absorptions, and enhanced electrical conductivity and reduced skin-depth, which is likely related to the interfacial defects within the TiO2 nanoparticles caused by the metal/hydrogen treatment.
Table of Contents
Introduction -- Proposal -- Methods -- Aluminum/hydrogen treated titanium dioxide nanoparticles -- Magnesium/hydrogen treated titanium dioxide nanoparticles -- Closing remarks -- Appendix A. Supplemental figures -- Appendix B. Software
Ph.D. (Doctor of Philosophy)