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Sensors 2016, 16(9), 1371; doi:10.3390/s16091371

Embedded Ceria Nanoparticles in Crosslinked PVA Electrospun Nanofibers as Optical Sensors for Radicals

1
Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
2
Center of Smart Nanotechnology and Photonics (CSNP), Smart CI Research Center, Alexandria University, Alexandria 21544, Egypt
3
USTAR Bioinnovations Center, Utah State University, Logan, UT 84341, USA
4
Department of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
5
Department of Chemical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
*
Author to whom correspondence should be addressed.
Academic Editor: Ki-Hyun Kim
Received: 24 February 2016 / Revised: 8 April 2016 / Accepted: 11 April 2016 / Published: 26 August 2016
(This article belongs to the Special Issue The Use of New and/or Improved Materials for Sensing Applications)
View Full-Text   |   Download PDF [2452 KB, uploaded 26 August 2016]   |  

Abstract

This work presents a new nanocomposite of cerium oxide (ceria) nanoparticles embedded in electrospun PVA nanofibers for optical sensing of radicals in solutions. Our ceria nanoparticles are synthesized to have O-vacancies which are the receptors for the radicals extracted from peroxide in water solution. Ceria nanoparticles are embedded insitu in PVA solution and then formed as nanofibers using an electrospinning technique. The formed nanocomposite emits visible fluorescent emissions under 430 nm excitation, due to the active ceria nanoparticles with fluorescent Ce3+ ionization states. When the formed nanocomposite is in contact with peroxide solution, the fluorescence emission intensity peak has been found to be reduced with increasing concentration of peroxide or the corresponding radicals through a fluorescence quenching mechanism. The fluorescence intensity peak is found to be reduced to more than 30% of its original value at a peroxide weight concentration up to 27%. This work could be helpful in further applications of radicals sensing using a solid mat through biomedical and environmental monitoring applications. View Full-Text
Keywords: ceria nanoparticles; electrospinning; crosslinking; fluorescence quenching; radicals ceria nanoparticles; electrospinning; crosslinking; fluorescence quenching; radicals
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MDPI and ACS Style

Shehata, N.; Samir, E.; Gaballah, S.; Hamed, A.; Elrasheedy, A. Embedded Ceria Nanoparticles in Crosslinked PVA Electrospun Nanofibers as Optical Sensors for Radicals. Sensors 2016, 16, 1371.

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