Flexible Polydimethylsilane Nanocomposites Enhanced with a Three-Dimensional Graphene/Carbon Nanotube Bicontinuous Framework for High-Performance Electromagnetic Interference Shielding

Abstract

High-performance electromagnetic interference (EMI)-shielding materials featuring lightweight, flexibility, excellent conductivity, and shielding properties, as well as superior mechanical robustness, are highly required, yet their development still remains a daunting challenge. Here, a flexible and exceptional EMI-shielding polydimethylsilane/reduced graphene oxide/single-wall carbon nanotube (PDMS/rGO/SWCNT) nanocomposite was developed by a facile backfilling approach utilizing a preformed rGO/SWCNT aerogel as the three-dimensional (3D) conducting and reinforcement skeleton. Pristine SWCNTs acting as secondary conductive fillers showed intriguing advantages, whose intrinsically high conductivity could be well preserved in the composites because of no surface acidification treatment. The robust and interconnected 3D network can not only serve as fast channels for electron transport but also effectively transfer external load. Accordingly, a prominent electrical conductivity of 1.2 S cm and an outstanding EMI-shielding effectiveness of around 31 dB over the X-band frequency range were achieved for the resultant composite with an ultralow loading of 0.28 wt %, which is among the best results for currently reported conductive polymer nanocomposites. Moreover, the composite displayed excellent mechanical properties and bending stability; for example, a 233% increment in the compression strength was obtained compared with that of neat PDMS. These observations indicate the unrivalled effectiveness of 3D rGO/SWCNT aerogel as a reinforcement to endow the polymer composites with outstanding conductive and mechanical properties toward high-performance EMI-shielding application.

Polypropylene Nanocomposite Filled with Spinel Ferrite NiFe2O4 Nanoparticles and In-Situ Thermally-Reduced Graphene Oxide for Electromagnetic Interference Shielding Application

“…Figure 10 depicts the total shielding effectiveness ( SE T ) of prepared nanocomposites with a frequency in the range of 5.8–8.2 GHz. The total shielding effectiveness SE T for shielding materials is [51]: SETdB=SERdB+SEAdB+SEMdB where SE R , SE A , and SE M are the shielding effectiveness related to reflection, absorption, and multiple reflections, respectively. Here, the term related to multiple reflections SE M can be flouted when SE T > 10 dB as [52]: SETdB=SERdB+SEAdB…”

Bioinspired Superwettability Micro/Nanoarchitectures: Fabrications and Applications

“…Slippery surfaces, also known as lubricant‐infused surfaces, are textured surfaces covered by a thin layer of lubricants with the lowest possible surface energy, such as the family of fluorinated oils . These surfaces should be made of materials that can be fluorinated for infusing lubricants.…”

Nanostructured cigarette wrapper encapsulated PDMS‐RGO sandwiched composite for high performance EMI shielding applications

“…The frequency dependent EMI SE of the composites has been presented in the Figure 5. From the Figure 5A, although the pure PDMS exhibits a low EMI SE T value of less than 1 dB (0.5 dB), [53] it provided flexible properties in the composite. To explore the effect of flexibility on EMI shielding performance of the PRC composite, we have measured the EMI SE value of the composite before and after 100 times of bending (manually) and no significant change in the EMI SE T value was observed, as shown in Figure S3 (SI).…”

“…PDMS/rGO/SWCNTs [53] Figure 5D shows the room temperature thermal conductivity of the PDMS-RGO-CW composites with different RGO loadings. The thermal conductivity of pure PDMS was observed to be 0.20 W/mK, which was very close to that reported elsewhere.…”