Shehata Nader, Samir Effat, Gaballah Soha, Hamed Aya, Saad Marwa, Salah Mohammed
Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt.
Center of Smart Nanotechnology and Photonics (CSNP), SmartCIResearch Center, Alexandria University, Alexandria, 21544, Egypt.
J Fluoresc. 2017 Mar;27(2):767-772. doi: 10.1007/s10895-016-2010-1. Epub 2016 Dec 28.
This paper introduces a detailed optical characterization for a novel fluorescent biodegradable nanocomposite of electro-spun chitosan nanofibers with in-situ embedded cerium oxide (ceria) nanoparticles as the nanocomposite optical fluorescent material. Under near ultra-violet excitation, this synthesized nanocomposite emits a visible green wavelength at nearly 520nmwith different intensities according to the concentration of the embedded fluorescent material; i.e. ceria nanoparticles. This emission is due to the synthesized ceria nanoparticles optical tri-valiant cerium ions ce, associated with formed oxygen vacancies with a direct allowed bandgap around 3.5 eV. Optical characteristics such as fluorescence emission intensity, absorbance dispersion, and direct bandgap are presented besides structural characteristics such as FTIR spectroscopy, and SEM analysis. The synthesized optical nanocomposite could be helpful in many further applications such as bio-imaging, biomedical engineering, and environmental optical sensors.
本文介绍了一种新型荧光可生物降解纳米复合材料的详细光学特性，该复合材料是通过静电纺丝法制备的壳聚糖纳米纤维，并原位嵌入了氧化铈（二氧化铈）纳米颗粒作为纳米复合光学荧光材料。在近紫外光激发下，这种合成的纳米复合材料根据嵌入荧光材料（即二氧化铈纳米颗粒）的浓度，在近520nm处发射出不同强度的可见绿色波长光。这种发射是由于合成的二氧化铈纳米颗粒中的光学三价铈离子Ce，与形成的氧空位相关，其直接允许带隙约为3.5 eV。除了通过傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析等结构特征外，还展示了荧光发射强度、吸光度色散和直接带隙等光学特性。这种合成的光学纳米复合材料在生物成像、生物医学工程和环境光学传感器等许多进一步的应用中可能会有所帮助。
