The impact of green chemistry to synthesize PVA/cobalt metal complexes (CoMCs) composites with enhanced optical behavior

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2024-11-19 DOI:10.1016/j.optmat.2024.116448

Dana S. Muhammad , Dara M. Aziz , Shujahadeen B. Aziz

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Abstract

This study focuses on the preparation of amorphous polymer composites with an indirect band gap, which are essential for advancing optoelectronic devices. We synthesized cobalt metal complexes (CoMCs) by combining an aqueous solution of cobalt (II) acetate with green tea dye (GTD) at 70 °C, utilizing a cost-effective and environmentally friendly approach. Polyvinyl alcohol (PVA) was integrated with the synthesized CoMCs using a solution cast method at ambient temperature. The resulting CoMCs and PVA-based composite films were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and UV–Vis spectroscopy. FTIR analysis provided insights into the functional groups of GTD and their role in CoMC formation, highlighting the innovative green coordination chemistry method for low-cost metal complex production. The interactions between PVA and CoMCs were confirmed by FTIR, while the optical properties demonstrated that green-synthesized metal complexes combined with polar polymers offer a novel approach to enhance absorption behavior and reduce the optical band gap. XRD analysis indicated an increase in the amorphous phase, and Urbach energy values confirmed a reduction in crystallinity. The Wemple-DiDomenico (W-D) model was employed to determine the optical parameters, including the band gap energy (E_g), which decreased from 6.05 eV to 1.5 eV with the addition of 36 mL of CoMCs. Furthermore, the optical dielectric function analysis provided important parameters such as effective mass (N/m∗), relaxation time (τ), plasma frequency (ω_p), optical mobility (μ_opt), and optical resistivity (ρ_opt). We also evaluated sheet resistance (Rs), thermal emissivity (ɛ_Th), and figure of merit (φ) for both pure and doped PVA films, with notable peaks in the figure of merit plots shifting to higher wavelengths as CoMCs concentration increased. This work demonstrates the effectiveness of multiple models and methodologies in accurately determining the optical band gap, emphasizing its significance for photonics and optoelectronic applications.

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绿色化学对合成具有增强光学性能的 PVA/钴金属复合物（CoMCs）复合材料的影响

本研究的重点是制备具有间接带隙的无定形聚合物复合材料，这对推动光电设备的发展至关重要。我们在 70 °C 下将醋酸钴 (II) 与绿茶染料 (GTD) 的水溶液结合在一起，合成了钴金属复合物 (CoMC)，这是一种成本效益高且环保的方法。在常温下，采用溶液浇注法将聚乙烯醇（PVA）与合成的 CoMC 结合在一起。通过 X 射线衍射 (XRD)、傅立叶变换红外光谱 (FTIR) 和紫外-可见光谱对合成的 CoMC 和基于 PVA 的复合薄膜进行了表征。傅立叶变换红外光谱分析深入揭示了 GTD 的官能团及其在 CoMC 形成过程中的作用，凸显了低成本生产金属复合物的创新绿色配位化学方法。傅立叶变换红外光谱证实了 PVA 与 CoMC 之间的相互作用，而光学性质则表明，绿色合成的金属配合物与极性聚合物的结合为增强吸收行为和减小光带隙提供了一种新方法。XRD 分析表明无定形相增加，Urbach 能值证实结晶度降低。采用 Wemple-DiDomenico（W-D）模型确定了光学参数，包括带隙能（Eg），添加 36 mL CoMC 后，带隙能从 6.05 eV 降至 1.5 eV。此外，光学介电函数分析还提供了有效质量（N/m∗）、弛豫时间（τ）、等离子体频率（ωp）、光迁移率（μopt）和光电阻率（ρopt）等重要参数。我们还评估了纯 PVA 薄膜和掺杂 PVA 薄膜的薄层电阻 (Rs)、热发射率 (ɛTh)和优越性图 (φ)，随着 CoMCs 浓度的增加，优越性图中的明显峰值会向更高波长移动。这项工作证明了多种模型和方法在准确测定光带隙方面的有效性，强调了光带隙对光子学和光电子学应用的重要意义。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.