Reduced Graphene Oxide Aerogels with Uniformly Self-Assembled Polyaniline Nanosheets for Electromagnetic Absorption

Abstract

Reduced graphene oxide (RGO)/polyaniline (PANI) composite aerogels (GPAs) with uniformly distributed PANI nanosheets were prepared by a facile self-assembly way. The fabricated hybrids present a cross-linked three-dimensional (3D) porous network, and RGO sheets were covered by PANI sheets with controlled content. The unique architecture efficiently reduced agglomeration of RGO and enhanced the conductive loss of the material to incident wave. Specifically, the GPA composite with 50 wt % PANI showed excellent electromagnetic wave absorption capacity; the largest reflection loss (RL) value reached −48 dB with fill loading of only 3%, and the qualified bandwidth (RL ≤ −10 dB) covered the entire Ku band (12–18 GHz). The study is expected to pave the way to prepare wide qualified bandwidth and lightweight graphene-based electromagnetic wave absorption hybrids with controlled microstructure.

Realizing Maximum Microwave Absorption of Poly(3,4-ethylenedioxythiophene) with a Data-Driven Method

“…For microwave-absorbing materials (MAMs), reflection loss (RL) and the effective bandwidth (Δ f 10 : the width of the peak where RL ≤ −10 dB, and ≥90% incident irradiation is lost) are two of the most important parameters for determining the quality of a material system for use in application. − Large RL and Δ f 10 values are highly desired for effective electromagnetic interference shielding. − Conducting polymers have been demonstrated as a highly utilized material class for coatings in applications including stealth technology and electromagnetic interference shielding. − They have been integrated into composite materials with great success, particularly in single plane-wave absorbers coated on metallic surfaces. − Materials such as polyaniline, polypyrrole, and poly­(3,4-ethylenedioxythiophene) (PEDOT) have been demonstrated as pure microwave-absorbing materials ,− and also been utilized in composites. − For example, microwave absorption with Δ f 10 4.5 GHz was demonstrated with PEDOT in an early study, and “broad” effective bandwidths were indicated with polypyrrole and polyaniline, while not accompanied many details . Liu et al utilized PEDOT as a substructure in a ternary composite containing graphene and cobalt ferrite to generate a strong microwave-absorption with an RL of −43.2 dB at 9.2 GHz and ascribed in part the activity of the ternary material to the high electrical conductivity of the added polymer .…”

A review on synthetic strategies and gas sensing approach for polypyrrole‐based hybrid nanocomposites

“…Reduced graphene oxide (rGO) has advantages as low cost and mass production and drawbacks as poor selectivity due to which rGO‐based materials provide a new pathway for NH 3 sensor production. [ 75,76 ] The sensor resistance is generated by the current power supply, and the current IEDs are supplied by 0.8 V power as a result of which the sensor shows the linear response of NH 3 from 1 to 4 ppm at room temperature, sensitivity of 6.1% ppm, response, and recovery times of 1 and 5 min, respectively. The rGO shows a higher density of vacancies and structural defects as compared to CVD graphene.…”

Recent advancements in the electromagnetic interference shielding performance of nanostructured materials and their nanocomposites: a review

“…RGO/PANI (50%) aerogels showed excellent EMW absorption performance with the refection loss of À48 dB and a matching thickness of 2.5 mm. 253 RGO covalently graed PANI nanocomposites also exhibited high performance as electromagnetic wave absorbers. 5.2.2 Graphene/polypyrrole and RGO/polypyrrole nanocomposites.…”

“…The formation of binary nanocomposites comprising carbonaceous nanofiller intrinsically conducting polymers (ICPs) has been receiving considerable attention in EMI shielding applications. 214–275 This is mainly ascribed to the low density, ease of processability, tuneable electrical conductivity and environmental stability of ICPs. Recently, binary, ternary and quaternary nanocomposites have been receiving more attention for their microwave absorption properties.…”