Abu Hurayra-Lizu K M, Bari Md Wahidujjaman, Gulshan Fahmida, Islam Muhammad Rakibul
Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh.
Department of Physics, Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh.
Heliyon. 2021 May 7;7(5):e06983. doi: 10.1016/j.heliyon.2021.e06983. eCollection 2021 May.
Graphene-based polymer composites are gaining interest as a modish class of substance that holds promising angles on diverse applications. In this work, Graphene Oxide (GO) based Polyvinyl Alcohol (PVA) nanocomposites (PVA-GO) have been prepared by employing a facile solution casting method. Low concentrations of GO nanofiller (0.25%, 0.50%, 0.75%, and 1.0%) were used and the result of the use of them over the distinct substantial characteristics of the nanocomposites was evaluated. The different features of the as-synthesized nanocomposites such as optical, structural, chemical, and thermal properties were identified by UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and Thermo-gravimetric analysis (TGA), respectively. From the structural analysis of the crystallinity of the nanocomposite it is evident that a reduction in crystallinity caused by the amalgamation of the GO nanofiller. FTIR study shows improved interaction between the GO nanofiller and PVA matrix. The incorporation of GO was found to reduce the optical band gap of the nanocomposite both for the direct and indirect transition. The Urbach energy of the nanocomposite increases with the increase of the GO concentration suggests the formation of localized states causing a reduction in the optical band gap. PVA-GO nanocomposites with improved and tunable physical properties synthesized from a simple and economic route may pave a new horizon for polymer-based optoelectronic devices.
基于石墨烯的聚合物复合材料作为一类时尚的物质正受到关注，在各种应用中具有广阔的前景。在这项工作中，采用简便的溶液浇铸法制备了基于氧化石墨烯（GO）的聚乙烯醇（PVA）纳米复合材料（PVA - GO）。使用了低浓度的GO纳米填料（0.25%、0.50%、0.75%和1.0%），并评估了它们对纳米复合材料不同实质特性的影响。通过紫外可见光谱、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和热重分析（TGA）分别确定了合成的纳米复合材料的不同特性，如光学、结构、化学和热性能。从纳米复合材料结晶度的结构分析可以明显看出，GO纳米填料的加入导致结晶度降低。FTIR研究表明GO纳米填料与PVA基体之间的相互作用得到改善。发现GO的加入降低了纳米复合材料直接和间接跃迁的光学带隙。纳米复合材料的乌尔巴赫能量随GO浓度的增加而增加，这表明形成了局域态，导致光学带隙减小。通过简单且经济的路线合成的具有改善和可调物理性能的PVA - GO纳米复合材料可能为基于聚合物的光电器件开辟新的前景。
