One-dimensional barium titanate coated multi-walled carbon nanotube heterostructures: synthesis and electromagnetic absorption properties

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3748-3756 ◽  
Author(s):  
Yao-Feng Zhu ◽  
Qing-Qing Ni ◽  
Ya-Qin Fu
Keyword(s):  
Carbon Nanotube ◽  
Barium Titanate ◽  
Reflection Loss ◽  
Frequency Bandwidth ◽  
Absorption Properties ◽  
Microwave Absorbers ◽  
One Dimensional ◽  
Electromagnetic Absorption ◽  
Multi Walled Carbon Nanotube ◽  
Maximum Reflection Loss

BaTiO3@MWCNT heterostructures have been explored as microwave absorbers, which showed the maximum reflection loss with value of −25.7 dB at 12.1 GHz for 40 wt% loadings in wax, and the frequency bandwidth less than −20 dB is from 11.3 to 13.8 GHz.

scholarly journals Excellent microwave absorption properties based on a composite of one dimensional Mo2C@C nanorods and a PVDF matrix

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21243-21248 ◽  
Author(s):  
Chao-Qin Li ◽  
Xun Shen ◽  
Ruo-Cheng Ding ◽  
Guang-Sheng Wang
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
One Dimensional ◽  
Absorption Performance ◽  
Pvdf Matrix ◽  
Maximum Reflection Loss

A Mo2C@C/PVDF composite with excellent absorption performance has been synthesized. The results indicate that the maximum reflection loss can reach −39.0 dB, and the absorbing bandwidth is up to 3.1 GHz at a thickness of 2.0 mm.

scholarly journals Nanostructured Barium Titanate/Carbon Nanotubes Incorporated Polyaniline as Synergistic Electromagnetic Wave Absorbers

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lujun Yu ◽  
Yaofeng Zhu ◽  
Chen Qian ◽  
Qiang Fu ◽  
Yongzhen Zhao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Wave ◽  
Barium Titanate ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Network Structures ◽  
Conductive Network ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Absorption

The three-dimensional (3D) conductive network structures formed by barium titanate/carbon nanotubes incorporated polyaniline were favorable for strengthening electromagnetic absorption capability. Herein, an easy and flexible method consisting of sol-gel technique, in situ polymerization, and subsequent mechanical method have been developed to prepare the barium titanate/carbon nanotubes incorporated polyaniline (CNTs/BaTiO3/PANI or CBP) ternary composites. The dielectric properties and microwave absorption properties of CNTs/BaTiO3/PANI composites were investigated in the frequency range of 2–18 GHz by vector network analyzer. Interestingly, it is found that the CNTs/BaTiO3/PANI composites with 3D conductive network structures presented outstanding electromagnetic absorption properties, which may be attributed to the high impedance matching behavior and improved dielectric loss ability and novel synergistic effect. Additionally, it also can be supposed that the “geometrical effect” of composite was more beneficial to absorbing the incident electromagnetic wave. The CNTs/BaTiO3/PANI composite (the mass ratio of CNTs/BaTiO3to PANI is 2 : 3) exhibits the best microwave absorption properties, of which the minimum reflection loss value can reach −30.9 dB at 8 GHz and the absorption bandwidth with a reflection loss blew −10 dB ranges from 7.5 to 10.2 GHz.

Synthesis, Magnetic and Electromagnetic Absorption Properties of Amorphous Core-Shell Fe-B@SiO2 Submicrospheres

2017 ◽  
Vol 727 ◽  
pp. 204-210
Author(s):  
Xuan Zhong ◽  
Jing Wei Cheng ◽  
Ying Liu ◽  
Xiu Chen Zhao
Keyword(s):  
Reflection Loss ◽  
Room Temperature ◽  
Core Shell ◽  
Ferromagnetic Behavior ◽  
Absorption Properties ◽  
Step Process ◽  
Absorption Bandwidth ◽  
Electromagnetic Absorption ◽  
Attractive Candidate ◽  
Maximum Reflection Loss

Amorphous core-shell Fe-B@SiO2 submicrospheres with the SiO2 shell layer of about 18 nm were fabricated via a two-step process. Fe-B submicrospheres were first obtained, and core-shell Fe-B@SiO2 submicrospheres were subsequently fabricated using TEOs as a Si source through a modified Stöber method. The measurements of the magnetic properties demonstrated that the amorphous core-shell Fe-B@SiO2 submicrospheres exhibit ferromagnetic behavior at room temperature. The maximum reflection loss reaches −24.8 dB at 11.76 GHz for the absorber with thickness of 2.2 mm. The absorption bandwidth with the reflection loss below −10 dB is up to 14.76 GHz for the absorber with a thickness of 1.5-6 mm and the absorption bandwidth with the reflection loss below −20 dB is up to 6.6 GHz for the absorber with a thickness of 1.8-3.1 mm. Our results demonstrates that the amorphous core-shell Fe-B@SiO2 submicrospheres obtained in this work are attractive candidate materials for the magnetic and EM wave absorption applications.

Ni filled flexible multi-walled carbon nanotube–polystyrene composite films as efficient microwave absorbers

2011 ◽  
Vol 99 (11) ◽  
pp. 113116 ◽  
Author(s):  
Rajesh Kumar Srivastava ◽  
T. N. Narayanan ◽  
A. P. Reena Mary ◽  
M. R. Anantharaman ◽  
Anchal Srivastava ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Composite Films ◽  
Microwave Absorbers ◽  
Multi Walled Carbon Nanotube

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

Temperature dependence of the electromagnetic and microwave absorption properties of polyimide/Ti3SiC2 composites in the X band

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86656-86664 ◽  
Author(s):  
Hongyu Wang ◽  
Dongmei Zhu ◽  
Wancheng Zhou ◽  
Fa Luo
Keyword(s):  
Temperature Dependence ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorption Bandwidth ◽  
X Band ◽  
Maximum Reflection Loss

The maximum reflection loss value of polyimide/Ti3SiC2 composites is up to −48.6 dB at 8.5 GHz with a thickness of 2.9 mm and the absorption bandwidth below −10 dB is 3.8 GHz.

Sign in / Sign up

Export Citation Format

Share Document