Electromagnetic (EM) energy covers a very large spectrum, from low energy radio waves to high energy gamma rays.  Humankind has utilized and controlled these various energy regions for applications ranging from radio communication to molecular and atomic level characterizations.  However, oftentimes unwanted and deleterious effects are observed from uncontrolled and undesired EM sources.  To mitigate and minimize these potentially harmful effects, numerous materials have been studied that specifically interact with various EM energies.  Such examples include IR reflective materials for passive heating and lead vests for x-ray protection.  Despite these and many additional examples, fundamental understanding of EM energy mitigating interactions at the molecular level remain amiss.  Here we have started using graphene oxide in combination with different metal and metal oxide nanoparticles in a systematic study to explore their interaction with microwave energy (1 to 300 GHz) as a function of molecular structure.  By using systematically controlled reduction of graphene oxide, the electronic structure can by varied, resulting in different dielectric properties.  By combining with metal and metal oxide nanoparticles with controllable properties (chemistry, size, concentration), the magnetic susceptibility can simultaneously be controlled resulting in tunable EM energy interactions.  Using vector network analysis in combination with structural characterization, we will report our progress towards understanding the effects of material structure on microwave absorption.<br/>

Fundamental study of graphene oxide-metal nanoparticle material hybrids for electromagnetic energy interference mitigation: Systematic structure/function analysis

2019 Fall National Meeting

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