Prism-shaped hollow carbon decorated with polyaniline for microwave absorption

Li, Xiang; Yu, Long; Zhao, Weikun; Shi, Yiyuan; Yu, Lujun; Dong, Yubing; Zhu, Yaofeng; Liu, Xiangdong; Fu, Feiya

doi:10.1016/j.cej.2019.122393

Cited by 160 publications

(23 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, µ' value of all samples slightly goes down from 1.6 to 1.0 between 2.0 to 10.5 GHz, and then fluctuates around approximately 1.2 with the increasing frequency and meanwhile µ" varies with some slight fluctuations within the entire frequency range. Interestingly enough, the µ" exhibits negative values at the high frequency, which be explained by the fact that EM energy is radiated out from CFO/CNTs composites due to the motion of charges, and this similar phenomena have been also reported in other work [24]. The magnetic loss tangent tanδm value of pure CoFe2O4 is mostly higher than that of the other three composites, as exhibited by Fig.…”

Section: Resultssupporting

confidence: 85%

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Zhang

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

In this article, spinel ferrite CoFe2O4 and multi-walled carbon nanotubes (MWCNTs) composites are constructed by a facile one-step solvothermal method.The pure phase of CoFe2O4 particles is confirmed by X-ray diffraction patterns.Microstructure analysis demonstrates that monodisperse CoFe2O4 microspheres are wound by MWCNTs. By the introduction of CNTs, there is a significant enhancement in the imaginary part of permittivity (ε″) with the composites. The champion microwave absorption performance can be achieved in the composites by the balance of complex permittivity and permeability. When the mass fraction of CNTs is 3%, a minimum reflection loss (RLmin) of the composites is as high as -46.65 dB at 14.4GHz at a thin thickness of 1.5 mm, and the corresponding effective absorption bandwidth below -10 dB reaches 4.91 GHz ranging from 12.41 to 17.32 GHz which covers almost the whole Ku band (12.0-18.0 GHz). In other words, this as-synthesized composites show the most outstanding specific RLmin of -31.1 dB•mm -1 . Such superior microwave absorption behaviors of CoFe2O4/CNTs originate mainly from multiple dielectric relaxation processes, enhanced impedance matching and magnetic loss, as well as the considerable interface between mesoporous CoFe2O4 hollow microspheres and CNTs, and thereby promoting microwave reflection and scattering within the samples. Our results indicate that as-fabricated CoFe2O4/CNTs composites can be a promising microwave absorbent integrating with thin thickness, strong absorption ability, and broad bandwidth absorption.

show abstract

Section: Resultssupporting

confidence: 85%

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Zhang

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…The XRD results of the CNCs further verified the HRTEM results. For the 3-PANI-CNC, there were new peaks located at about 12 • and 25 • , which were attributed to (001) and (002) of the graphitized prism-shaped hollow carbon [43]. This confirmed that with the deposition of PANI, the 3-PANI-CNCs' surfaces increased as the new graphitized prism-shaped hollow carbon emerged.…”

Section: Confirmation Of Surficial Decoration Of Pani On Array Cncssupporting

confidence: 61%

“…The peak centered at 1486 and 1411 cm −1 was attributed to the stretching of the C=C group in the benzenoid or quinoid ring. The peaks located at 1304 cm −1 and 1213 cm −1 were attributed to the stretching of the C-N group on the secondary aromatic amines [43]. The broad peak located at 1160 cm −1 was attributed to the stretching of N=Q=N (where Q means the quinone-type rings), which is a characteristic peak of the "electronic-like band".…”

Section: Confirmation Of Surficial Decoration Of Pani On Array Cncsmentioning

confidence: 99%

Ultrathin PANI-Decorated, Highly Purified and Well Dispersed Array Cncs for Highly Sensitive HCHO Sensors

Yang

et al. 2021

Chemosensors

View full text Add to dashboard Cite

The flocculation of small surficial groups on pristine CNCs (carbon nanocoils) bundles limit their application. In this study, we designed and fabricated novel array CNCs with a surficial decoration of polyaniline (PANI) using in situ methods. Atomic layer deposition (ALD) and chemical vapor deposition (CVD) methods were employed to fabricate the highly pure array CNCs. The array CNCs decorated with ultra-thin PANI were confirmed by different characterizations. Furthermore, this material displayed a good performance in its detection of formaldehyde. The detection results showed that the CNCs coated with PANI had a low limit of detection of HCHO, as low as 500 ppb, and the sensor also showed good selectivity for other interfering gases, as well as good repeatability over many tests. Furthermore, after increasing the PANI loading on the surface of the CNCs, their detection performance exhibited a typical volcanic curve, and the value of the enthalpy was extracted by using the temperature-varying micro-gravimetric method during the process of detection of the formaldehyde molecules on the CNCs. The use of array CNCs with surficial decoration offers a novel method for the application of CNCs and could be extended to other applications, such as catalysts and energy conversion.

show abstract

“…Whereas to the as-prepared samples, the values of real part (μ') and imaginary part (μ'') of complex permeability μ r (μ r =μ'-jμ'') are maintained at 1.0 and 0.0, respectively (Fig. S3), indicating that the MA of samples is mainly dependent on dielectric loss [28]. In addition, it is found that several resonance peaks exist in the dielectric loss curves of VGCFs/PDMS-SMEP composites, implying the raise of multiple relaxation processes.…”

Section: Microwave Absorption Properties Of Vgcfs/pdms-smep Compositesmentioning

confidence: 99%

A broadband and tunable microwave absorption technology enabled by VGCFs/PDMS-EP shape memory composites

Zhu

Liu

et al. 2020

Composite Structures

Self Cite

View full text Add to dashboard Cite

A facile method for fabricating intelligent microwave absorber of vapor grown carbon fibers/Polydimethylsiloxaneepoxy resin shape memory composites (VGCFs/PDMS-SMEP) composites was proposed to deliver intelligently tunable and broadband microwave absorption performance. The maximal absorption intensity was regulated by varying the deformation of the composites driven by the superior shape memory property of SMEP, where practical the minimum reflection loss (RLmin) reaches -55.7 dB at 16.0 GHz with the thickness of 2.0 mm. The effective absorption bandwidth (EAB) reached 9.8 GHz, which covered the whole applied frequency range (8.2-18.0 GHz). The intelligent microwave absorption performance of the sample was attributed to robust conductive loss and dielectric loss enhanced by the dipole relaxations and multi-reflections. Thus, VGCFs/PDMS-SMEP composites serves as the key that really opens up opportunity for the application as flexible, shape memory and tunable high performance broadband microwave absorption absorber in frontiers such as wearable electronic devices, chips protection, stealth technology and information security.

show abstract

Prism-shaped hollow carbon decorated with polyaniline for microwave absorption

Cited by 160 publications

References 41 publications

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

High-efficiency microwave absorption performance of cobalt ferrite microspheres/multi-walled carbon nanotube composites

Ultrathin PANI-Decorated, Highly Purified and Well Dispersed Array Cncs for Highly Sensitive HCHO Sensors

A broadband and tunable microwave absorption technology enabled by VGCFs/PDMS-EP shape memory composites

Contact Info

Product

Resources

About