Aniline-functionalized rGO/polyaniline hybrids: A synergistic approach for enhanced microwave absorption

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-05-14 DOI:10.1016/j.diamond.2025.112437

Rohit B. Sutar , Aasiya S. Jamadar , Susmita S. Patil , Reshma V. Khandekar , Jyotiprakash B. Yadav

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引用次数: 0

Abstract

In pursuit of lightweight and flexible microwave-absorbing materials, reduced graphene oxide (rGO)/polyaniline (PANI) hybrids exhibit immense potential due to their synergistic dielectric properties. This study presents a novel one-pot strategy for the covalent functionalization of graphene oxide (GO) with aniline, followed by reduction to yield aniline-functionalized rGO (Ani-rGO). This approach effectively mitigates the intrinsic limitations of pristine rGO, including agglomeration and suboptimal impedance matching. Subsequently, rGO/PANI composites were synthesized via in-situ polymerization of aniline in the presence of varying Ani-rGO concentrations, utilizing citric acid as an environmentally benign dopant. The covalent bonding formation into the rGO/PANI hybrids was confirmed through Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and morphology by field emission scanning electron microscope (FESEM). The covalent integration of PANI nanorods onto the Ani-rGO framework facilitated enhanced charge transport, interfacial polarization, and dielectric loss, culminating in superior microwave absorption (MA) performance. The optimized composite achieved a minimum reflection loss (RL) of −47.09 dB at 9.63 GHz with an effective absorption bandwidth (EAB) of 3.51 GHz at a 2 mm thickness, significantly outperforming pristine rGO and Ani-rGO. These findings underscore the efficacy of Ani-rGO/PANI hybrids as advanced electromagnetic interference (EMI) shielding materials, offering a strategic pathway for developing next-generation lightweight, high-performance microwave absorbers.

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苯胺功能化氧化石墨烯/聚苯胺杂化物：增强微波吸收的协同方法

在追求轻量化和柔性微波吸收材料的过程中，还原氧化石墨烯(rGO)/聚苯胺（PANI）杂化物由于其协同介电特性而显示出巨大的潜力。本研究提出了一种新的一锅策略，用于氧化石墨烯（GO）与苯胺的共价功能化，然后还原生成苯胺功能化的氧化石墨烯（Ani-rGO）。这种方法有效地减轻了原始氧化石墨烯的固有限制，包括团聚和次优阻抗匹配。随后，利用柠檬酸作为环境友好型掺杂剂，在不同浓度的反氧化石墨烯存在下，通过苯胺的原位聚合合成了还原氧化石墨烯/聚苯胺复合材料。通过傅里叶变换红外光谱（FTIR）、x射线衍射（XRD）、x射线光电子能谱（XPS）和场发射扫描电镜（FESEM）形貌证实了氧化石墨烯/聚苯胺杂化物的共价键形成。聚苯胺纳米棒在反氧化石墨烯框架上的共价整合促进了电荷输运、界面极化和介电损耗的增强，最终实现了优越的微波吸收（MA）性能。优化后的复合材料在9.63 GHz时的最小反射损耗（RL）为- 47.09 dB，在2mm厚度时的有效吸收带宽（EAB）为3.51 GHz，明显优于原始rGO和anti -rGO。这些发现强调了anti - rgo /PANI杂化材料作为先进电磁干扰（EMI）屏蔽材料的有效性，为开发下一代轻质高性能微波吸收材料提供了战略途径。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.