Shehata Nader, Gaballah Soha, Samir Effat, Hamed Aya, Saad Marwa
Department of Engineering Mathematics and Physics, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt.
Center of Smart Nanotechnology and Photonics (CSNP), SmartCI Research Center, Alexandria University, Alexandria 21544, Egypt.
Nanomaterials (Basel). 2016 Jun 1;6(6):102. doi: 10.3390/nano6060102.
This paper introduces a new fluorescent nanocomposite of electrospun biodegradable nanofibers embedded with optical nanoparticles. In detail, this work introduces the fluorescence properties of PVA nanofibers generated by the electrospinning technique with embedded cerium oxide (ceria) nanoparticles. Under near-ultra violet excitation, the synthesized nanocomposite generates a visible fluorescent emission at 520 nm, varying its intensity peak according to the concentration of embedded ceria nanoparticles. This is due to the fact that the embedded ceria nanoparticles have optical tri-valiant cerium ions, associated with formed oxygen vacancies, with a direct allowed bandgap around 3.5 eV. In addition, the impact of chemical crosslinking of the PVA on the fluorescence emission is studied in both cases of adding ceria nanoparticles or of a post-synthesis addition via a spin-coating mechanism. Other optical and structural characteristics such as absorbance dispersion, direct bandgap, FTIR spectroscopy, and SEM analysis are presented. The synthesized optical nanocomposite could be helpful in different applications such as environmental monitoring and bioimaging.
本文介绍了一种新型的荧光纳米复合材料，它是由嵌入了光学纳米粒子的电纺可生物降解纳米纤维构成。具体而言，这项工作介绍了通过电纺技术制备的、嵌入了氧化铈（二氧化铈）纳米粒子的聚乙烯醇（PVA）纳米纤维的荧光特性。在近紫外光激发下，合成的纳米复合材料在520nm处产生可见荧光发射，其强度峰值会根据嵌入的二氧化铈纳米粒子的浓度而变化。这是因为嵌入的二氧化铈纳米粒子含有光学三价铈离子，与形成的氧空位相关，其直接允许带隙约为3.5eV。此外，在添加二氧化铈纳米粒子或通过旋涂机制进行合成后添加这两种情况下，都研究了PVA的化学交联对荧光发射的影响。还介绍了其他光学和结构特性，如吸光度色散、直接带隙、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析。合成的光学纳米复合材料可能有助于环境监测和生物成像等不同应用。
