scholarly journals Lightweight, Flexible Cellulose-Derived Carbon Aerogel@Reduced Graphene Oxide/PDMS Composites with Outstanding EMI Shielding Performances and Excellent Thermal Conductivities

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Ping Song ◽  
Bei Liu ◽  
Chaobo Liang ◽  
Kunpeng Ruan ◽  
Hua Qiu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Freeze Drying ◽  
Carbon Aerogel ◽  
Urea Solution ◽  
Cellulose Solution ◽  
Emi Shielding ◽  
Excellent Thermal Stability ◽  
Reduced Graphene ◽  
Shielding Composites

AbstractIn order to ensure the operational reliability and information security of sophisticated electronic components and to protect human health, efficient electromagnetic interference (EMI) shielding materials are required to attenuate electromagnetic wave energy. In this work, the cellulose solution is obtained by dissolving cotton through hydrogen bond driving self-assembly using sodium hydroxide (NaOH)/urea solution, and cellulose aerogels (CA) are prepared by gelation and freeze-drying. Then, the cellulose carbon aerogel@reduced graphene oxide aerogels (CCA@rGO) are prepared by vacuum impregnation, freeze-drying followed by thermal annealing, and finally, the CCA@rGO/polydimethylsiloxane (PDMS) EMI shielding composites are prepared by backfilling with PDMS. Owing to skin-core structure of CCA@rGO, the complete three-dimensional (3D) double-layer conductive network can be successfully constructed. When the loading of CCA@rGO is 3.05 wt%, CCA@rGO/PDMS EMI shielding composites have an excellent EMI shielding effectiveness (EMI SE) of 51 dB, which is 3.9 times higher than that of the co-blended CCA/rGO/PDMS EMI shielding composites (13 dB) with the same loading of fillers. At this time, the CCA@rGO/PDMS EMI shielding composites have excellent thermal stability (THRI of 178.3 °C) and good thermal conductivity coefficient (λ of 0.65 W m-1 K-1). Excellent comprehensive performance makes CCA@rGO/PDMS EMI shielding composites great prospect for applications in lightweight, flexible EMI shielding composites. Graphic abstract

Hydroiodic acid and microwave reduced graphene oxide/PES-C films for flexible EMI shielding materials

2021 ◽  
pp. 108645
Author(s):  
Jiaying Li ◽  
Wei Li ◽  
Xingyu Tong ◽  
Shaowei Lu ◽  
Baichen Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Emi Shielding ◽  
Hydroiodic Acid ◽  
Reduced Graphene

Absorption enhanced EMI shielding using silver decorated three-dimensional porous architected reduced graphene oxide in polybenzoxazine matrix

2021 ◽  
Author(s):  
Kumaran Rengaswamy ◽  
vinaya kumar - asapu ◽  
Sundara Ramaprabhu ◽  
Subramanian Venkatachalam
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Three Dimensional ◽  
Electronic Media ◽  
Emi Shielding ◽  
Highly Efficient ◽  
Reduced Graphene

The proliferation of wearable and portable electronic media increases the demand for developing highly efficient shielding materials to address the issue of electromagnetic interferences. This paper reports the development of...

Magnetically Aligned Fe3O4 Nanowires-Reduced Graphene Oxide for Gas Barrier, Microwave Absorption, and EMI Shielding

2020 ◽  
Vol 3 (9) ◽  
pp. 9340-9355
Author(s):  
Peipei Fu ◽  
Xianhua Huan ◽  
Jintao Luo ◽  
Shujie Ren ◽  
Xiaolong Jia ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Emi Shielding ◽  
Gas Barrier ◽  
Reduced Graphene ◽  
Magnetically Aligned

scholarly journals Barium ferrite decorated reduced graphene oxide nanocomposite for effective electromagnetic interference shielding

2015 ◽  
Vol 17 (3) ◽  
pp. 1610-1618 ◽  
Author(s):  
Meenakshi Verma ◽  
Avanish Pratap Singh ◽  
Pradeep Sambyal ◽  
Bhanu Pratap Singh ◽  
S. K. Dhawan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Interference ◽  
Barium Ferrite ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Reduced Graphene

Barium ferrite decorated reduced graphene oxide nanocomposite has been synthesized for absorption dominated enhanced EMI shielding.

Synthesis of reduced graphene oxide paper for EMI shielding by a multi-step process

2020 ◽  
Vol 13 (05) ◽  
pp. 2051024
Author(s):  
Yangyang Lin ◽  
Genliang Hou ◽  
Song Bi ◽  
Xunjia Su ◽  
Hao Li
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Functional Groups ◽  
Electromagnetic Interference ◽  
Reduction Process ◽  
Emi Shielding ◽  
Hydroiodic Acid ◽  
X Band ◽  
Reduced Graphene ◽  
Graphene Oxide Paper

A multi-step reduction process was developed to produce reduced graphene oxide (rGO) paper for electromagnetic interference (EMI) shielding. First step reduction was achieved by hydroiodic acid to remove most of the oxygen-containing functional groups, and sodium borohydride was used in the second step reduction to reduce carbonyl group which is the most difficult functional group to remove. In the last step reduction, hydroiodic acid was used as reducing agent again to remove the remaining oxygen-containing functional groups. The results show that this method can greatly improve the conductivity and EMI shielding performance of rGO paper. The resulting rGO paper with a C/O ratio of 19.38 and a thickness of 9.1[Formula: see text][Formula: see text]m exhibited high conductivity of 1084[Formula: see text]S/cm and excellent average EMI shielding efficiency of 45.84[Formula: see text]dB in the X-band, better than that reduction by other chemical methods.

Thorny trunk-like structure of reduced graphene oxide/HKUST-1 MOF for enhanced EMI shielding capability

2020 ◽  
Author(s):  
Quyen Vu Thi ◽  
Ngoc Quang Nguyen ◽  
Inwook Oh ◽  
Junpyo Hong ◽  
Chong Min Koo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Emi Shielding ◽  
Reduced Graphene

A sandwich nanocomposite composed of commercially available SnO and reduced graphene oxide as advanced anode materials for sodium-ion full batteries

2021 ◽  
Author(s):  
Xu Yang ◽  
Hao-Jie Liang ◽  
Xin-Xin Zhao ◽  
Hai-Yue Yu ◽  
Mei-Yi Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Anode Materials ◽  
Sandwich Structure ◽  
Freeze Drying ◽  
Specific Capacity ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Reduced Graphene

A sandwich structure with SnO and reduced graphene oxide (SnO/rGO) is designed via freeze drying. It delivers a specific capacity of 109.5 mA h g−1 with a retention of 70.62% after 1200 cycles at 4 A g−1, revealing its stable cycling performance.

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