Department of Manufacturing and Materials Engineering, Faculty of Engineering, International Islamic University of Malaysia, Kuala Lumpur, Gombak, Malaysia.
Prof. Hameeds Advanced Polymeric Materials Research Lab, Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani, Kurdistan Regional Government, Iraq.
Sci Rep. 2020 Oct 22;10(1):18108. doi: 10.1038/s41598-020-75138-x.
In the present study black tea extract (BTE) solution which is familiar for drinking was used to prepare cerium metal-complexes (Ce(III)-complex). The prepared Ce(III)-complex was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-Vis spectroscopy. The results indicate that BTE solution is a novel green coordination chemistry approach for the synthesis of metal complexes. The outcomes signify that coordination occurs between cerium cations and polyphenols. The synthesis of metal-complexes with superior absorption performance in the visible region is a challenge for optoelectronic device applications. The suspended Ce(III)-complex in distilled water was mixed with poly (vinyl alcohol) (PVA) polymer to fabricate PVA/ Ce(III)-complex composites with controlled optical properties. The PVA/Ce(III)-complexes composite films were characterized by FTIR, XRD, and UV-Vis spectroscopy. The XRD findings confirms the amorphous structure for the synthesized Ce(III)-complexes. The addition of Ce(III)-complex into the PVA host polymer led to the growth of polymer composites with controllable small optical band gaps. It is shown by the FTIR spectra of the composite films that the functional groups of the host PVA have a vigorous interaction with the Ce(III)-complex. The XRD deconvolution on PVA composites reveals the amorphous phase enlargement with increasing Ce(III)-complex concentration. It is indicated in the atomic force microscopy (AFM) that the surface roughness in the doped PVA films increases with the increase of the Ce(III)-complex. There is a decrease in absorption edge from 5.7 to 1.7 eV. It becomes possible to recognize the type of electron transition by studying both the Tauc's model and optical dielectric loss (ɛ) parameter.
在本研究中，使用常见的饮用红茶提取物 (BTE) 溶液来制备铈金属配合物 (Ce(III)-complex)。通过傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD) 和紫外可见光谱对制备的 Ce(III)-complex 进行了表征。结果表明，BTE 溶液是合成金属配合物的一种新颖的绿色配位化学方法。结果表明，配合物的形成是通过铈阳离子和多酚之间的配位作用。合成具有优异可见光吸收性能的金属配合物是光电设备应用的挑战。将悬浮在蒸馏水中的 Ce(III)-complex 与聚乙烯醇 (PVA) 聚合物混合，制备具有可控光学性能的 PVA/Ce(III)-complex 复合材料。通过 FTIR、XRD 和紫外可见光谱对 PVA/Ce(III)-complex 复合材料进行了表征。XRD 结果证实了合成的 Ce(III)-complex 为无定形结构。Ce(III)-complex 加入到 PVA 主链聚合物中，导致具有可控小光学带隙的聚合物复合材料的生长。复合材料薄膜的 FTIR 光谱表明，主链 PVA 的官能团与 Ce(III)-complex 之间存在强烈的相互作用。PVA 复合材料的 XRD 分峰表明，随着 Ce(III)-complex 浓度的增加，非晶相的尺寸增大。原子力显微镜 (AFM) 表明，掺杂 PVA 薄膜的表面粗糙度随 Ce(III)-complex 的增加而增加。吸收边从 5.7 降至 1.7 eV。通过研究 Tauc 模型和光学介电损耗 (ɛ) 参数，可以确定电子跃迁的类型。
