title: Embedded Ceria Nanoparticles in Crosslinked PVA Electrospun Nanofibers as Optical Sensors for Radicals.
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 Ce(3+) 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.
authors: Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt. Nader.shehata@alexu.edu.eg.|Center of Smart Nanotechnology and Photonics (CSNP), Smart CI Research Center, Alexandria University, Alexandria 21544, Egypt. Nader.shehata@alexu.edu.eg.|USTAR Bioinnovations Center, Utah State University, Logan, UT 84341, USA. Nader.shehata@alexu.edu.eg.
authors: Nader
authors: N
authors: Shehata
authors: Center of Smart Nanotechnology and Photonics (CSNP), Smart CI Research Center, Alexandria University, Alexandria 21544, Egypt. effat_samir@mena.vt.edu.|Department of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt. effat_samir@mena.vt.edu.
authors: Effat
authors: E
authors: Samir
authors: Center of Smart Nanotechnology and Photonics (CSNP), Smart CI Research Center, Alexandria University, Alexandria 21544, Egypt. soha_gaballah@mena.vt.edu.|Department of Chemical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt. soha_gaballah@mena.vt.edu.
authors: Soha
authors: S
authors: Gaballah
authors: Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt. aya_ali@mena.vt.edu.|Center of Smart Nanotechnology and Photonics (CSNP), Smart CI Research Center, Alexandria University, Alexandria 21544, Egypt. aya_ali@mena.vt.edu.
authors: Aya
authors: A
authors: Hamed
authors: Center of Smart Nanotechnology and Photonics (CSNP), Smart CI Research Center, Alexandria University, Alexandria 21544, Egypt. Asmaa.adel29@gmail.com.|Department of Chemical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt. Asmaa.adel29@gmail.com.
authors: Asmaa
authors: A
authors: Elrasheedy
keywords: ceria nanoparticles; crosslinking; electrospinning; fluorescence quenching; radicals