Optical sensing of metal tiny particles using ceria nanoparticles via fluorescence quenching technique

2017 ◽  
Author(s):  
N. Shehata ◽  
E. Samir ◽  
S. Gaballah ◽  
M. R. M. Rizk ◽  
B. Mokhtar ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Optical Sensing ◽  
Ceria Nanoparticles ◽  
Fluorescence Quenching Technique

Optical sensing of peroxide using ceria nanoparticles via fluorescence quenching technique

2016 ◽  
Vol 10 (3) ◽  
pp. 036002 ◽  
Author(s):  
Nader Shehata ◽  
Effat Samir ◽  
Soha Gaballah ◽  
Mohammed Salah
Keyword(s):  
Fluorescence Quenching ◽  
Optical Sensing ◽  
Ceria Nanoparticles ◽  
Fluorescence Quenching Technique

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.

Interactions between Ofloxacin and NOM Investigated by Fluorescence Quenching Technique

Vom Wasser ◽  
2003 ◽  
pp. 85-98
Author(s):  
Margit B. Müller ◽  
Karlien Vercammen ◽  
Fritz H. Frimmel
Keyword(s):  
Fluorescence Quenching ◽  
Fluorescence Quenching Technique
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