Synthesis of CoNi/SiO2 core-shell nanoparticles decorated reduced graphene oxide nanosheets for enhanced electromagnetic wave absorption properties

2018 ◽  
Vol 44 (18) ◽  
pp. 22189-22197 ◽  
Author(s):  
Xudong Liu ◽  
Ying Huang ◽  
Na Zhang ◽  
Suhua Zhou
Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 845
Author(s):  
Qi Yu ◽  
Yiyi Wang ◽  
Ping Chen ◽  
Weicheng Nie ◽  
Hanlin Chen ◽  
...  

The efficient preparation of electromagnetic wave absorbing materials with low density and excellent electromagnetic wave absorption remains a considerable challenge. In this study, reduced graphene oxide (RGO) wrapped Fe3O4 nanoparticles (NPs) were synthesized based on one-step reaction by the reduction of graphene oxide (GO), and the generation of super-fine Fe3O4 NPs was achieved. The phase structure, chemical composition, micromorphology, and magnetism were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM), respectively. The electromagnetic characteristics were evaluated on a vector network analyzer by the coaxial line method. The results showed that super-fine Fe3O4 NPs with an average size of 6.18 nm are densely distributed on the surface of graphenes. The RGO/Fe3O4 nanocomposites exhibited excellent microwave absorption properties with a minimum reflection loss (RL) of up to −55.71 dB at 6.78 GHz at 3.5 mm thickness and the highest effective absorption bandwidth with RL values exceeding −10 dB is 4.76 GHz between 13.24 and 18 GHz at 1.7 mm thickness. This work provides a concise method for the development of RGO supported super dense Fe3O4 nanocomposites for high performance electromagnetic absorption applications.


2019 ◽  
Vol 253 ◽  
pp. 171-174
Author(s):  
Avanish Kumar Srivastava ◽  
Bhumika Samaria ◽  
Pourush Sharma ◽  
Virendra Singh Chauhan ◽  
Smita Soni ◽  
...  

RSC Advances ◽  
2015 ◽  
Vol 5 (64) ◽  
pp. 51690-51700 ◽  
Author(s):  
Soumen Dutta ◽  
Chaiti Ray ◽  
Sourav Mallick ◽  
Sougata Sarkar ◽  
Anindita Roy ◽  
...  

An Aucore–Pdshell-decorated reduced graphene oxide nanocomposite is successfully employed for the electrochemical detection of low-level hydrazine in an aqueous solution.


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