Document Type

Article

Journal/Book Title/Conference

Journal of Nanophotonics

Volume

12

Issue

1

Publisher

Society of Photo-optical Instrumentation Engineers

Publication Date

2-6-2018

First Page

1

Last Page

9

Abstract

Ceria nanoparticles are studied as optical probe for different types of tiny metallic particles using fluorescence quenching technique. The synthesized ceria nanoparticles are characterized by having formed charged oxygen vacancies, which can be considered as the main receptors for the used tiny metallic particles to be sensed or absorbed. Under near-UV excitation, the visible fluorescent emission intensity is found to be reduced with increasing the concentration of the studied tiny metallic particles in an aqueous solution. To emphasize the optical sensing process, ceria nanoparticles fluorescence lifetime measurements were demonstrated before and after adding the tiny metallic particles. In addition, Stern– Volmer constants, which are considered as an indication for the sensitivity to quenchers, have been calculated for the used ceria nanoparticles and found to be 1.645, and 0.768 M-1 for both lead and iron sensing, respectively. This work could be further helpful as sensitive optical sensors in both biomedical and environmental applications

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