scholarly journals X-band metamaterial absorbers based on reduced graphene oxide-silicon carbide-linear low density polyethylene composite

2020 ◽  
Vol 7 ◽  
pp. 8
Author(s):  
Pankaj Bora ◽  
Utpal Jyoti Mahanta ◽  
Jayanta Kumar Sarmah ◽  
Jyoti Prasad Gogoi
Keyword(s):  
Silicon Carbide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Material Design ◽  
Resonant Peak ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Band Frequency ◽  
X Band ◽  
Reduced Graphene

Graphene oxide obtained by Hummer's method is used to synthesize reduced graphene oxide (RGO) using chemical and thermal treatment method. Flexible composites of RGO-Silicon carbide (SiC)-Low density polyethylene (LLDPE) in different wt.% ratios of fillers are characterized for complex permittivity and permeability in X-band. A metamaterial design of ring shaped with four stripe structure is designed on developed substrate as well as standard FR4 substrate and simulated using EM simulator, CST Microwave Studio. Simulated results showed shifting of resonant peak frequency from C-band frequency for FR4 substrate to X-band for developed substrates signifying a role of microwave constitutive properties of the dielectric spacer. The fabricated metamaterial structure on RGO-SiC-LLDPE composite of thickness 0.7 mm shows a S11 ∼ −25 dB at 10.7 GHz with maximum absorption of 96.7%. Thus, the developed meta-material design showing a potential application in microwave applications.

scholarly journals In Situ Cross-Linking of Silane Functionalized Reduced Graphene Oxide and Low-Density Polyethylene

2020 ◽  
Vol 2 (5) ◽  
pp. 1897-1908
Author(s):  
Syeda S. Abbas ◽  
Gregory J. Rees ◽  
Georgios Patias ◽  
Claire E. J. Dancer ◽  
John V. Hanna ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Low Density ◽  
Reduced Graphene

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.

The effective determination of Cd(ii) and Pb(ii) simultaneously based on an aluminum silicon carbide-reduced graphene oxide nanocomposite electrode

The Analyst ◽  
2017 ◽  
Vol 142 (15) ◽  
pp. 2741-2747 ◽  
Author(s):  
Yale Wu ◽  
Tao Yang ◽  
Kuo-Chih Chou ◽  
Junhong Chen ◽  
Lei Su ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glass Carbon Electrode ◽  
Reduced Graphene ◽  
Glass Carbon ◽  
Aluminum Silicon Carbide ◽  
First Time ◽  
Aluminum Silicon

A platform for the simultaneous determination of Cd(ii) and Pb(ii) in aqueous solution has been applied using an aluminum silicon carbide-reduced graphene oxide (Al4SiC4–RGO) nanocomposite modified glass carbon electrode (GCE) for the first time.

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