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Full-Text Articles in Life Sciences
Plasmonic-Ceria Nanoparticles As Fluorescence Intensity And Lifetime Quenching Optical Sensor, Nader Shehata, Effat Samir, Ishac Kandas
Plasmonic-Ceria Nanoparticles As Fluorescence Intensity And Lifetime Quenching Optical Sensor, Nader Shehata, Effat Samir, Ishac Kandas
Biology Faculty Publications
Ceria nanoparticles have been recently used as an optical fluorescent material with visible emission under ultraviolet excitation, due to the formation of trivalent cerium ions with corresponding oxygen vacancies. This paper introduces the enhancement of both fluorescence emission and lifetime through adding gold nanoparticles. The reason is due to possible coupling between the plasmonic resonance of gold nanoparticles and the fluorescence emission of ceria that has been achieved, along with enhanced formation of trivalent cerium ions. Both factors lead to higher fluorescence intensity peaks and shorter fluorescence lifetimes. As an application, gold-ceria nanoparticles have been used as an optical sensing …
Electrospun Pva Polymer Embedded With Ceria Nanoparticles As Silicon Solar Cells Rear Surface Coaters For Efficiency Improvement, Effat Samir, Mohamed Salah, Ali Hajjiah, Nader Shehata, Marwa Fathy, Aya Hamed
Electrospun Pva Polymer Embedded With Ceria Nanoparticles As Silicon Solar Cells Rear Surface Coaters For Efficiency Improvement, Effat Samir, Mohamed Salah, Ali Hajjiah, Nader Shehata, Marwa Fathy, Aya Hamed
Biology Faculty Publications
This paper introduces electrospun nanofibers embedded with ceria nanoparticles as silicon solar cells coaters, showing their influence on the solar cells efficiency. Ceria nanoparticles can be synthesized to have formed oxygen vacancies (O-vacancies), which are associated with converting cerium ions from the Ce4+ state ions to the Ce3+ ones. These O-vacancies follow the rule of improving silicon solar cellconductivity through the hopping mechanism. Besides, under violet excitation, the reduced trivalent cerium Ce3+ ions are directly responsible for down-converting the un-absorbed violet or ultra-violet (UV) wavelengths to a resulted green fluorescence emission at ~520 nm. These are absorbed through the silicon …