Retracted : EMI shielding effectiveness of expanded graphite and reduced graphene oxide

2018 ◽  
Vol 66 (7) ◽  
pp. 785-785 ◽  
Author(s):  
S. P. Gairola ◽  
Preeti Gairola ◽  
S. K. Shah ◽  
Rajeev Gupta
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Expanded Graphite ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Reduced Graphene

scholarly journals Nickel-reduced graphene oxide-cellulose nanofiber composite papers for electromagnetic interference shielding

BioResources ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 814-824
Author(s):  
Zhibing Chen ◽  
Qinqin Zhang ◽  
Wanyao Meng ◽  
Zhenxing Wang ◽  
Xuewen Han ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Flexible Electronics ◽  
Electromagnetic Interference ◽  
Cellulose Nanofiber ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Filtration Method ◽  
Reduced Graphene ◽  
Composite Paper

With the widespread use of electronic communication devices, ultra-thin, flexible, and high-performance electromagnetic interference (EMI) shielding materials are widely used to prevent radiation pollution. Moreover, graphene-reinforced polymer-based nanocomposites have received increasing attention in the field of EMI shielding because of their excellent electrical properties. In this work, ultrathin and flexible nickel/reduced graphene oxide/cellulose nanofiber (Ni/RGO/CNFs) composite paper was fabricated using a step-by-step vacuum-assisted filtration method. The prepared composite paper with Ni/RGO to CNF ratio of 3:1 and a thickness of 105 µm attained the electrical conductivity of 1664 S/m and 22.6 dB of excellent electromagnetic shielding effectiveness (SE). In addition, the composite paper (2:1) exhibited great mechanical properties, leading to a high tensile strength of 78.4 MPa, 10.3% fracture strain, and no obvious fractures or cracks when the composite paper was folded. Therefore, the Ni/RGO/CNFs composite paper prepared in this study is an effective lightweight shielding material, especially in flexible electronics and wearable devices.

Constructing interconnected spherical hollow conductive networks in silver platelets/reduced graphene oxide foam/epoxy nanocomposites for superior electromagnetic interference shielding effectiveness

Nanoscale ◽  
2019 ◽  
Vol 11 (46) ◽  
pp. 22590-22598 ◽  
Author(s):  
Chaobo Liang ◽  
Ping Song ◽  
Hua Qiu ◽  
Yali Zhang ◽  
Xiangteng Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Interference ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Reduced Graphene ◽  
Electrical Conductivities ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
Spherical Hollow

How to significantly increase electromagnetic interference (EMI) shielding performances by improving electrical conductivities is still a serious challenge.

The investigation of the electromagnetic shielding effectiveness of multi-layered nanocomposite materials from reduced graphene oxide-doped P(AN-VAc) nanofiber mats/PP spunbond

2018 ◽  
Vol 53 (11) ◽  
pp. 1541-1553
Author(s):  
İsmail Tiyek ◽  
Mustafa Yazıcı ◽  
Mehmet Hakkı Alma ◽  
Şükrü Karataş
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Surface Samples ◽  
Reduced Graphene ◽  
Nanofiber Mats ◽  
Electromagnetic Shielding Effectiveness ◽  
Poly Acrylonitrile ◽  
Shielding Material

In this study, the production of an electromagnetic shielding material by doping reduced graphene oxide was aimed. Graphene oxide was produced from graphite through modified Hummer's method, and reduced graphene oxide was obtained by reducing graphene oxide. The reduced graphene oxide- doped poly(acrylonitrile-co-vinyl acetate) nanofiber mats were spun on the Polypropylene spunbond fabrics by a multi-needle electrospinning device at different lap numbers. Multi-layered surface samples of spunbond/nanofiber mats were obtained via calendaring process after overlapping in different layer numbers. The electromagnetic shielding effectiveness (EMSE) of these samples was measured in the range of 0.03–1.5 GHz according to ASTM D4935 standard. The effects of the numbers of laps and layers on the electromagnetic shielding effectiveness of the mats were also investigated. It was found that electromagnetic shielding effectiveness is greatly affected by changing the numbers of laps and layers. Consequently, the highest electromagnetic shielding effectiveness value of 35.49 dB was obtained from the sample containing two layers of nanofiber mats, each of which consisted 50 laps of nanofibers.

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...

Electromagnetic shielding effectiveness of carbon fabric/epoxy composite with continuous graphene oxide fiber and multiwalled carbon nanotube

2018 ◽  
Vol 52 (24) ◽  
pp. 3341-3350 ◽  
Author(s):  
Nuray Ucar ◽  
Burçak Karagüzel Kayaoğlu ◽  
Arınc Bilge ◽  
Gunseli Gurel ◽  
Pınar Sencandan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Interference ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Multiwalled Carbon ◽  
Oxide Fiber ◽  
Reduced Graphene ◽  
Electromagnetic Interference Shielding Effectiveness

Carbon fabric composite is used in technical applications such as aircrafts in which electromagnetic shielding (electromagnetic interference–shielding effectiveness) is required. Traditionally, metallic coatings or metal plates are used for electromagnetic shielding, however, conductive filler-filled composite is also alternative to metal sheets due to its light weight. In the literatures, there are studies about effect carbon nanotube and graphene oxide flakes on electromagnetic interference; however, there are no studies encountered that search the effect of carbon nanotube/graphene oxide fiber and alignment of graphene oxide fiber on electromagnetic interference. Thus, in this study, fabrication of light-weight carbon fabric/epoxy composite filled with graphene oxide fiber, reduced graphene oxide fiber and multiwalled carbon nanotube and alignment of graphene oxide fiber was studied for the first time for both electromagnetic shielding (electromagnetic interference–shielding effectiveness) and electrical conductivity. It was found that reduced graphene oxide with two layers at the same alignment (0–0) leads to increment in the electromagnetic interference–shielding effectiveness value, while reduced graphene oxide with opposite alignment (0–90) leads to decrease in the electromagnetic interference–shielding effectiveness value. Opposite to literatures for graphene oxide flakes, highly rough surface of graphene oxide fiber and reduced graphene oxide fiber causes a deterioration in electromagnetic interference–shielding effectiveness due to disruptive multiple reflections resulted from highly rough surface of graphene oxide fiber, which causes multiple reflection effect. Multiwalled carbon nanotube generally provides higher electromagnetic interference–shielding effectiveness than graphene-based fiber because it has higher conductivity and has no disruptive effect of crimpy surface as graphene oxide fiber. Multiwalled carbon nanotube loading of 15 wt% results to 32 dB electromagnetic interference–shielding effectiveness, which is considered an adequate and moderate level of shielding for many applications.

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