Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

IF 3.1 4区工程技术 Q2 POLYMER SCIENCE

Polymers for Advanced Technologies Pub Date : 2024-07-18 DOI:10.1002/pat.6515

C. M. Kavitha, K. M. Eshwarappa, M. P. Shilpa, Shivakumar Jagadish Shetty, S. C. Gurumurthy, K. U. Kiran, Sachin Shet

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引用次数: 0

Abstract

Herein we report the method to tailor the band gap and UV absorption of polyvinyl alcohol (PVA)/graphene oxide (GO)‐silver (Ag)/glutaraldehyde (GA) hybrid polymer nanocomposites. The modifications brought by neutron irradiation to the optical and dielectric characteristics enabled the band gap and UV absorption‐tailored polymer nanocomposites to be obtained. Neutron‐irradiated samples, compared with their unirradiated counterparts, exhibit a reduction in transmittance to 78%, rendering them opaque to UV–visible light after irradiation. The energy band gap decreases from 5.25 to 4.09 eV upon irradiation. Furthermore, upon neutron‐irradiation the relaxation time increases from 7.63 × 10−4 to 0.02 s which is evident by the shift in electric modulus imaginary part (M") peak to a lower frequency region, indicating an increase in relaxation time. The Cole–Cole plot for irradiated samples demonstrates lower fitting parameter (α) values of the modified Havriliak–Negami function, indicating a departure from pure capacitor‐like behavior. The neutron irradiation leads to a decrease in conductivity from 44.6 × 10−7 to 0.09 × 10−7 S/cm.

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具有定制带隙和紫外线吸收能力的杂化聚合物纳米复合材料，可用于光电子学和紫外线防护领域的先进应用

在此，我们报告了定制聚乙烯醇（PVA）/氧化石墨烯（GO）-银（Ag）/戊二醛（GA）杂化聚合物纳米复合材料带隙和紫外线吸收的方法。中子辐照对光学和介电特性的改变使得带隙和紫外吸收定制的聚合物纳米复合材料得以获得。与未经过中子辐照的样品相比，经过中子辐照的样品的透射率降低到 78%，辐照后对紫外线-可见光不透明。辐照后，能带间隙从 5.25 eV 减小到 4.09 eV。此外，经中子辐照后，弛豫时间从 7.63 × 10-4 秒增加到 0.02 秒，这从电模量虚部（M"）峰向低频区移动可以看出，表明弛豫时间增加。辐照样品的科尔-科尔图显示，修正的哈夫里利亚克-内加米函数的拟合参数 (α)值较低，这表明样品偏离了纯电容器行为。中子辐照导致电导率从 44.6 × 10-7 降至 0.09 × 10-7 S/cm。

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来源期刊

Polymers for Advanced Technologies 工程技术-高分子科学

CiteScore

6.20

自引率

5.90%

发文量

337

审稿时长

2.1 months

期刊介绍： Polymers for Advanced Technologies is published in response to recent significant changes in the patterns of materials research and development. Worldwide attention has been focused on the critical importance of materials in the creation of new devices and systems. It is now recognized that materials are often the limiting factor in bringing a new technical concept to fruition and that polymers are often the materials of choice in these demanding applications. A significant portion of the polymer research ongoing in the world is directly or indirectly related to the solution of complex, interdisciplinary problems whose successful resolution is necessary for achievement of broad system objectives. Polymers for Advanced Technologies is focused to the interest of scientists and engineers from academia and industry who are participating in these new areas of polymer research and development. It is the intent of this journal to impact the polymer related advanced technologies to meet the challenge of the twenty-first century. Polymers for Advanced Technologies aims at encouraging innovation, invention, imagination and creativity by providing a broad interdisciplinary platform for the presentation of new research and development concepts, theories and results which reflect the changing image and pace of modern polymer science and technology. Polymers for Advanced Technologies aims at becoming the central organ of the new multi-disciplinary polymer oriented materials science of the highest scientific standards. It will publish original research papers on finished studies; communications limited to five typewritten pages plus three illustrations, containing experimental details; review articles of up to 40 pages; letters to the editor and book reviews. Review articles will normally be published by invitation. The Editor-in-Chief welcomes suggestions for reviews.