Superior quality chemically reduced graphene oxide for high performance EMI shielding materials

Sadek, Ramy; Sharawi, Mohammad S.; Dubois, Charles; Tantawy, Hesham; Chaouki, Jamal

doi:10.1039/d2ra02678c

Cited by 9 publications

(4 citation statements)

References 65 publications

(103 reference statements)

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“…The AFM images of graphene oxide nanosheets are shown in Figure S4a–d, which shows the increase of thickness after polydopamine modification. And the morphology of polydopamine-modified graphene oxide is shown in Figure S4e,f, which retains the wrinkled structure of graphene oxide, and the element distribution shows that C, N, and O elements are evenly distributed on the nanosheets. Dopamine is oxidized on the surface of graphene oxide and polymerized into polydopamine coated on the surface of nanosheets.…”

Section: Results and Discussionmentioning

confidence: 96%

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

Wang

Zhang

2023

Ind. Eng. Chem. Res.

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With the problem of electromagnetic interference (EMI) increasingly serious, the development of lightweight and flexible electromagnetic shielding composite films with excellent Joule heating performance and good mechanical properties is of great significance for modern electronic devices. In this study, we prepared aramid nanofiber/aramid nanofiber-poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/polydopamine-modified reduced graphene oxide (ANF/APP/PRGO) composite films with excellent electromagnetic shielding properties and electrical heating properties by stepwise vacuum filtration. With high conductivity (124.10 S/cm) and multi-interface electromagnetic wave reflection caused by the layered structure, the composite films achieve an EMI shielding effectiveness (SE) as high as 40.52 dB at 8.2–12.4 GHz (X-band) with a low thickness (∼22 μm). At the same time, the composite films also exhibit excellent electrical heating performance with fast response and cycle stability, which can reach a surface saturation temperature as high as 127.6 °C under an applied voltage of 7 V. Therefore, it can be envisaged that the ANF/APP/PRGO composite films have certain practical application value in the fields of electromagnetic shielding and electric heating.

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Section: Results and Discussionmentioning

confidence: 96%

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

Wang

Zhang

2023

Ind. Eng. Chem. Res.

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“…The developed two-step protocol offers high-quality TCRGO with a high conductivity of 2.14*10 3 (S/m). It is worth noting that determining the electrical conductivity of graphene as a compressed powder is a difficult task because they are anisometric particles with a high surface area; as a result, a high number of particle contacts affect the bulk conductivity and lowers its values, rendering it incomparable with the electrical conductivity of their composite. , Pure BF and MAG have a conductivity of 15 ± 3 and 19 ± 3 (S/m), respectively. These values dramatically increase with the addition of TCRGO above 10 wt %.…”

Section: Resultsmentioning

confidence: 99%

“…The developed two-step reduction protocol, which produces a high quality TCRGO, was applied to investigate its highly conductive properties in binary ceramic nanocomposites. 50 Starting with the improved Hummers’ method, 51 2 g of graphite was added to an acidic mixture of 240 mL of sulfuric acid (H 2 SO 4 ) and 26 mL of phosphoric acid (H 3 PO 4 ) followed by the addition of 12 g of potassium permanganate (KMnO 4 ) in portions while stirring to avoid heat accumulation and guarantee a thorough distribution. It was then left for 3 days.…”

Section: Methodsmentioning

confidence: 99%

Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption

et al. 2023

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The developed nanocomposite exhibits significantly enhanced shielding performance due to the synergistic effect of high dielectric and magnetic loss materials, which modifies the material's impedance and improves its absorption ability. Different weight percentages (0, 1, 5, 10, 15, 20, and 25 wt %) of thermally treated chemically reduced graphene oxide (TCRGO) were combined with two types of magnets, barium hexaferrite (BF) and magnetite (MAG), using a dry powder compaction technique to produce binary ceramic nanocomposite sheets. The shielding performance of a 1 mm thick compressed nanoceramic sheet over the X-band was evaluated using a vector network analyzer. The 25% TCRGO showed high shielding performance for both BF and MAG, while BF had a total shielding efficiency (SET) that exceeded MAG by 130%. The SET of 25 wt % TCRGO/BF was 52 dB, with a 41 dB absorption shielding efficiency (SEA). Additionally, the effect of different levels of incident electromagnetic wave power (0.001−1000 mW) at various thicknesses (1, 2, and 5 mm) was explored. At 1000 mW, the 5 mm TCRGO/BF had an SET of 99 dB, an SEA of 91 dB, and a reflection shielding efficiency (SER) of 8 dB. The use of BF as a hard magnet paired with TCRGO exhibited excellent and stable electromagnetic shielding performance.

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“…This process achieves an outstanding attenuation of 94 dB with a loading capacity of 0.08 g.cm -2 . [235].…”

Section: Strategies For Developing T-rgobms For Interference Shieldingmentioning

confidence: 99%

Correlating Heat Treatment Conditions with the Physicochemical Properties of Thermally Reduced Graphene Oxide-Based Materials: A Comprehensive Review

AKBI,

RAFAI,

MEKKI

et al. 2024

Univers. J. Carbon Res.

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The straightforward, cost-efficient, and scalable route of preparing graphene oxide-based materials (GOBMs) from graphite and transforming them into thermally reduced graphene oxide-based materials (T-RGOBMs) through heat treatment offers unparalleled versatility in customizing and refining the physicochemical properties of T-RGOBMs for various applications. To fully exploit the potential of this route, it is essential to determine the correlation between the physicochemical properties of the resulting T-RGOBMs and the preparation and heat treatment conditions of GOBMs. This article intends to provide a comprehensive discussion of the use of heat treatment routes to prepare T-RGOBMs with finely tuned physicochemical properties for specific applications. The review will focus on the key factors that can affect the end-product features, including the method of preparation of graphite oxide, the physical form of the ensuing GOBMs, and the parameters of the heat treatment process, such as temperature, heating rate, duration, atmosphere, and pressure. Furthermore, it will concentrate on the thermal transformations that take place during heat treatment, delve into the mechanisms and kinetics governing thermal decomposition, evaluate the potential risks associated with reducing GOBMs through heat treatment, and outline strategies to ensure a safe reduction process. The review will also explore recent advancements in the application of T-RGOBMs, providing examples of heat treatment strategies employed across various fields, including supercapacitors, gas sensing, and interference shielding. It serves as a useful guide for researchers and practitioners looking to appropriately prepare GOBMs and safely utilize the heat treatment to fine-tune their properties toward specific applications.

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Superior quality chemically reduced graphene oxide for high performance EMI shielding materials

Abstract: The developed two-step protocol offers a superior reduced graphene oxide TCRGOL quality (7 layers), and its SET was 94 dB over the X-band.

Cited by 9 publications

References 65 publications

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption

Correlating Heat Treatment Conditions with the Physicochemical Properties of Thermally Reduced Graphene Oxide-Based Materials: A Comprehensive Review

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