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Open AccessArticle

Gold/QDs-Embedded-Ceria Nanoparticles: Optical Fluorescence Enhancement as a Quenching Sensor

by Nader Shehata 1,2,3,4,5,*, Effat Samir 6,* and Ishac Kandas 1,2,3
1
Center of Smart Nanotechnology and Photonics (CSNP), SmartCI Research Center, Alexandria University, Alexandria 21544, Egypt
2
Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
3
Kuwait College of Science and Technology, Doha Area, 7th Ring Road, Safat 13133, Kuwait
4
USTAR Bio-Innovation center, Utah State University, Logan, UT 84341, USA
5
The Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
6
Department of Electrical Engineering, Old Dominion University, Norfolk, VA 23529, USA
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1236; https://doi.org/10.3390/app10041236
Received: 6 November 2019 / Revised: 26 December 2019 / Accepted: 3 January 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Optical and Optoelectronic Materials and Applications)
This work focuses on improving the fluorescence intensity of cerium oxide (ceria) nanoparticles (NPs) through added plasmonic nanostructures. Ceria nanoparticles are fluorescent nanostructures which can emit visible fluorescence emissions under violet excitation. Here, we investigated different added plasmonic nanostructures, such as gold nanoparticles (Au NPs) and Cadmium sulfide/selenide quantum dots (CdS/CdSe QDs), to check the enhancement of fluorescence intensity emissions caused by ceria NPs. Different plasmonic resonances of both aforementioned nanostructures have been selected to develop optical coupling with both fluorescence excitation and emission wavelengths of ceria. In addition, different additions whether in-situ or post-synthesis have been investigated. We found that in-situ Au NPs of a 530 nm plasmonic resonance wavelength provides the highest fluorescence emissions of ceria NPs compared to other embedded plasmonic structures. In addition to the optical coupling between plasmonic resonance of Au with the visible emissions fluorescence spectrum of ceria nanoparticles, the 530 nm in-situ Au NPs were found to reduce the bandgap of ceria NPs. We suggest that the formation of more tri-valent cerium ions traps energy levels along with more associated oxygen vacancies, which is responsible for increasing the fluorescence visible emissions intensity caused by ceria. As an application, the gold-ceria NPs is shown to optically detect the varied concentration of iron tiny particles in aqueous medium based on a fluorescence quenching mechanism. This work is promising in different applications such as biomarkers, cancer treatments, and environmental pollution monitoring. View Full-Text
Keywords: ceria nanoparticles; gold nanoparticles; quantum dots; fluorescence ceria nanoparticles; gold nanoparticles; quantum dots; fluorescence
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Shehata, N.; Samir, E.; Kandas, I. Gold/QDs-Embedded-Ceria Nanoparticles: Optical Fluorescence Enhancement as a Quenching Sensor. Appl. Sci. 2020, 10, 1236.

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