Highly conductive porous graphene film with excellent folding resilience for exceptional electromagnetic interference shielding

Lai, Dengguo; Chen, Xiaoxiao; Wang, Gang; Xu, Xinhai; Wang, Yin

doi:10.1039/d0tc01346c

Cited by 48 publications

(36 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although STG was foam-like, its microstructure was composed of well-stacked graphene (Figure i) due to the strong driving force at the multiphase interface during self-assembly, and hence its conductivity was as high as 108.1 ± 14.2 S m –1 by interconnected rGO flakes as well as thermal reduction during boiling . This improved electrical conductivity is consistent with the previous report of the porous graphene film fabricated by a confined foaming technique that contributed to the enhanced structural integrity of rGO sheets . Meanwhile, we found that the STG-400C prepared by simple annealing of STG exhibited the highest conductivity of 574.0 ± 4.0 S m –1 due to further reduction of oxygen functional groups and improved crystal structures.…”

Section: Resultssupporting

confidence: 90%

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Kim

Lee

et al. 2021

ACS Nano

View full text Add to dashboard Cite

Currently, researchers are paying much attention to the development of effective 3D graphene for applications in energy storage and environmental purification. Before commercialization, however, it is necessary to develop a method that allows for the large-scale production of such materials and enables good control over their structural and chemical properties. With this objective, we herein developed a simple method for the formation of large-scale (4 in. wafer) 3D graphene networks via the self-assembly of graphene sheets at a superheated liquid−vapor interface. The structural morphology of this porous network could be modified by controlling the vaporization rate, surface temperature of the target substrate, and amount of discharged colloids. The key mechanism behind this intriguing result was investigated by high-speed visualization of microdroplet behavior and extensive thermal analysis. This self-assembled 3D graphene had excellent electrical and mechanical properties. Our approach can be directly used for the mass production of graphene-based materials.

show abstract

Section: Resultssupporting

confidence: 90%

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Kim

Lee

et al. 2021

ACS Nano

View full text Add to dashboard Cite

show abstract

“…The comprehensive list of the materials presented is provided in Table S2 in the Supporting Information. As observed in the plots, the presented porous graphene film with distinguished features exhibits an SSE of >550 dB cm 3 g −1 and SSE/t of >220 000 dB cm 2 g −1 , which is higher or comparable to most state‐of‐the‐art high‐performing porous graphene [ 6c,14c,15,30 ] and MXene films. [ 28 ]…”

Section: Resultsmentioning

confidence: 72%

3D Porous Graphene Films with Large‐Area In‐Plane Exterior Skins

Tay

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

Construction of macroscopic 3D architectures of graphene is crucial to harness the advantageous properties of planar 2D graphene and to enable integration to many conventional and novel applications. Ideally, the 3D structure of graphene should be free of defects, covalently interconnected, and can be produced at large‐scale. Among various assembly techniques, fabrication using chemical vapor deposition (CVD) enables the production of high‐quality graphene where selection of template is the key that determines its consequent crystalline quality and structural morphology. Herein, a new method is presented to synthesize high‐quality porous graphene film by incorporating an in situ reduction–oxidation cycling treatment to generate micrometer‐sized pores on commercial Ni foil using an all‐CVD process route. Owing to the unique morphological features of the modified Ni template, the graphene film exhibits a holey surface with large‐area exterior skin coverage of >94% and many interconnected ligaments within its porous interior. This extraordinary configuration gives rise to superior in‐plane electrical conductivity despite its low density. In comparison to state‐of‐the‐art materials for electromagnetic interference shielding, this porous graphene film is among the best performing materials with a specific shielding effectiveness of >550 dB cm3 g−1 and absolute effectiveness of >220 000 dB cm2 g−1.

show abstract

“…[ 31 ] The EMI SE of the PP/APP/CNTs composites was measured in the X‐band, which is the frequency domain widely used in telecommunication applications. [ 32 ] To investigate the effects of CNT concentration on the total EMI SE (SE T ) of the composites, the SE T of PP/APP/CNTs samples 2 mm in thickness was studied and the results are shown in Figure 7b. The SE T showed a weak dependence over the whole X‐band; thus, it would be meaningful to use the average EMI SE to discuss the EMI shielding performance of the obtained composites.…”

Section: Resultsmentioning

confidence: 99%

Microwave‐Assisted Confining Flame‐Retardant Polypropylene in Carbon Nanotube Conductive Networks for Improved Electromagnetic Interference Shielding and Flame Retardation

Feng

Xie

et al. 2021

Adv Eng Mater

View full text Add to dashboard Cite

Electrical conductive polymer composites (CPCs) with segregated structure can achieve better electrical conductivity with low content of conductive filler. Nevertheless, the undesirable properties of these CPCs, such as ease of burning, high smoke generation, weak interfacial adhesion, and poor mechanical performance, have restricted their practical applications. Herein, a promising microwave‐assisted strategy is developed for the fabrication of a flame‐retardant and electrically conductive polypropylene/ammonium polyphosphate/carbon nanotube (PP/APP/CNT) composite. Highly conductive networks can be set via the microwave‐selective heating, which results in an electromagnetic shielding effectiveness (EMI SE) of 32.1 dB of the composite with 7 wt% content of CNTs. Furthermore, the conductive segregated CNT network also serves as an excellent char‐forming agent to enhance the nonflammability and overcome the melt dripping issue of the pure PP matrix. As a result, the segregated conductive PP composites with 7 wt% CNTs and 15 wt% APP exhibit melt dripping and prompt self‐extinguishment, achieving the V‐0 rating level in the UL‐94 test. In brief, the well‐defined microwave‐assisted process provides a promising approach to fabricate various CPCs with simultaneously improved EMI shielding and flame‐retarding properties.

show abstract

Highly conductive porous graphene film with excellent folding resilience for exceptional electromagnetic interference shielding

Abstract:
The porous graphene film is ultrathin, lightweight and highly conductive, and exhibits excellent folding endurance and superior EMI shielding performance.

Cited by 48 publications

References 54 publications

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

3D Porous Graphene Films with Large‐Area In‐Plane Exterior Skins

Microwave‐Assisted Confining Flame‐Retardant Polypropylene in Carbon Nanotube Conductive Networks for Improved Electromagnetic Interference Shielding and Flame Retardation

Contact Info

Product

Resources

About

Highly conductive porous graphene film with excellent folding resilience for exceptional electromagnetic interference shielding

Abstract: The porous graphene film is ultrathin, lightweight and highly conductive, and exhibits excellent folding endurance and superior EMI shielding performance.

Cited by 48 publications

References 54 publications

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

3D Porous Graphene Films with Large‐Area In‐Plane Exterior Skins

Microwave‐Assisted Confining Flame‐Retardant Polypropylene in Carbon Nanotube Conductive Networks for Improved Electromagnetic Interference Shielding and Flame Retardation

Contact Info

Product

Resources

About

Abstract:
The porous graphene film is ultrathin, lightweight and highly conductive, and exhibits excellent folding endurance and superior EMI shielding performance.