Plasmonic-ceria nanoparticles for automated optical fluorescence-quenching of dissolved oxygen

2018 ◽  
Author(s):  
Bassem Mokhtar ◽  
Nader Shehata ◽  
Ishac Kandas ◽  
Mohamed Azab ◽  
Effat Samir
Keyword(s):  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Ceria Nanoparticles ◽  
Optical Fluorescence

Lanthanide-doped ceria nanoparticles as fluorescence-quenching probes for dissolved oxygen

2013 ◽  
Vol 183 ◽  
pp. 179-186 ◽  
Author(s):  
N. Shehata ◽  
K. Meehan ◽  
I. Ashry ◽  
I. Kandas ◽  
Y. Xu
Keyword(s):  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Ceria Nanoparticles ◽  
Doped Ceria

scholarly journals In-Situ Gold–Ceria Nanoparticles: Superior Optical Fluorescence Quenching Sensor for Dissolved Oxygen

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 314 ◽  
Author(s):  
Nader Shehata ◽  
Ishac Kandas ◽  
Effat Samir
Keyword(s):  
Gold Nanoparticles ◽  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Optical Sensing ◽  
Fluorescence Emission ◽  
Water Quality Monitoring ◽  
Fluorescence Emission Spectrum ◽  
Ceria Nanoparticles ◽  
The Impact

Cerium oxide (ceria) nanoparticles (NPs) have been proved to be an efficient optical fluorescent material through generating visible emission (~530 nm) under violet excitation. This feature allowed ceria NPs to be used as an optical sensor via the fluorescence quenching Technique. In this paper, the impact of in-situ embedded gold nanoparticles (Au NPs) inside ceria nanoparticles was studied. Then, gold–ceria NPs were used for sensing dissolved oxygen (DO) in aqueous media. It was observed that both fluorescence intensity and lifetime were changed due to increased concentration of DO. Added gold was found to enhance the sensitivity of ceria to DO quencher detection. This enhancement was due to optical coupling between the fluorescence emission spectrum of ceria with the surface plasmonic resonance of gold nanoparticles. In addition, gold caused the decrease of ceria nanoparticles’ bandgap, which indicates the formation of more oxygen vacancies inside the non-stoichiometric crystalline structure of ceria. The Stern–Volmer constant, which indicates the sensitivity of optical sensing material, of ceria–gold NPs with added DO was found to be 893.7 M−1, compared to 184.6 M−1 to in case of ceria nanoparticles only, which indicates a superior optical sensitivity to DO compared to other optical sensing materials used in the literature to detect DO. Moreover, the fluorescence lifetime was found to be changed according to the variation of added DO concentration. The optically-sensitivity-enhanced ceria nanoparticles due to embedded gold nanoparticles can be a promising sensing host for dissolved oxygen in a wide variety of applications including biomedicine and water quality monitoring.

Response to Comment on “Solubility Enhancement and Fluorescence Quenching of Pyrene by Humic Substance:  The Effects of Dissolved Oxygen on Quenching Processes”

1996 ◽  
Vol 30 (4) ◽  
pp. 1409-1410 ◽  
Author(s):  
Yu-Ping Chin ◽  
Jeffrey M. Buterbaugh ◽  
Terry J. Gustafson ◽  
Samuel J. Traina ◽  
Karlin M. Danielsen
Keyword(s):  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Humic Substance ◽  
Solubility Enhancement

Solubility Enhancement and Fluorescence Quenching of Pyrene by Humic Substances: The Effect of Dissolved Oxygen on Quenching Processes

1995 ◽  
Vol 29 (8) ◽  
pp. 2162-2165 ◽  
Author(s):  
Karlin M. Danielsen ◽  
Yu-Ping. Chin ◽  
Jeffrey S. Buterbaugh ◽  
Terry L. Gustafson ◽  
Samuel J. Traina
Keyword(s):  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Humic Substances ◽  
Solubility Enhancement
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