Luiz G Jacobsohn Clemson University DMR 1653016 Aluminum oxide fabricated with traces of carbon is commercially used for the measurement of the irradiation dose of X and gamma rays Recently the incorporation of carbon and magnesium to control the electronic properties of this material has bee ID: 1012777
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1. CAREER: Towards Engineering Electronic Defects in Inorganic Luminescent MaterialsLuiz G. Jacobsohn , Clemson UniversityDMR 1653016Aluminum oxide fabricated with traces of carbon is commercially used for the measurement of the irradiation dose of X and gamma rays. Recently, the incorporation of carbon and magnesium to control the electronic properties of this material has been proposed. A collaboration between the grant’s principal investigator and colleagues from universities in Brazil pioneered an investigation of the response of this material to ultraviolet radiation (UV). UV radiation is the fraction of solar light that causes skin tan. It is used in sterilization of medical tools and germicidal treatment of water and certain foods. A nearly proportional response to low UV irradiation doses followed by saturation was found, as illustrated in the figure. This behavior was explained by how UV radiation is absorbed by the material. Response intensity in counts to UV radiation in terms of energy density. The set of data points on the lower left shows a nearly linear behavior, while points from more energetic UV irradiations (top right) show a trend for saturation.
2. CAREER: Towards Engineering Electronic Defects in Inorganic Luminescent Materials Luiz G. Jacobsohn, Clemson UniversityDMR 1653016Arguably, most kids heard about or saw a picture of a crystal. Some may have even seen a natural crystal. The evident symmetry certainly called their attention. However, crystals are not a common science topic in school, and students may never learn what crystals truly are. In fact, most individuals do not know that advanced materials like semiconductor devices found in computers and smart phones are composed of tiny crystals. This National Science Foundation grant funded the distribution of “Crystal Structure” lab kits to 6th grade science students of Liberty Middle School, Liberty, SC. Hands-on activities supervised by the grant’s principal investigator introduced the important concept of crystalline structures and the spatial organization of atoms.Crystal structure built by students of Liberty Middle School, Liberty, SC, as part of Broad Impact activities introducing the concept of spatial organization of atoms to about forty 6th graders.