Random copper/yttrium iron garnet composites with tunable negative electromagnetic parameters prepared by in situ synthesis

Sun, Kai; Zhang, Zidong; Fan, Runhua; Chen, Min; Cheng, Chuanbing; Hou, Qing; Zhang, Xihua; Liu, Yao

doi:10.1039/c5ra09882c

Cited by 49 publications

(21 citation statements)

References 31 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, the negative permittivity should be related to the inductive character 58,59. A similar phenomenon was also observed in Cu/Y 3 Fe 5 O 12 ,60 Fe/epoxy resin61 and carbon nanotubes/graphene/phenolic resin composites 62…”

Section: Resultssupporting

confidence: 62%

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Sun

Wang

Xin

et al. 2020

Macro Materials & Eng

Self Cite

View full text Add to dashboard Cite

In this work, a hydrosoluble matrix is used for the first time to prepare flexible membranous composites, in order to improve their environmental friendliness and simplify the processing. Modified graphene (GR) sheets are distributed in polyvinyl alcohol (PVA) solution to achieve flexible GR/PVA metacomposites. As graphene content increases, an interconnected graphene network is eventually formed among the PVA matrix, and the resulting composites present a conductor‐like behavior. Interestingly, the Drude‐like negative permittivity is obtained in the composites with 20 wt% graphene, which is ascribed to the plasma oscillation. Meanwhile, the absolute values of negative permittivity decrease by several orders of magnitude due to the moderate electron density of graphene. It is demonstrated that the negative permittivity is dependent on the inductive character. This work provides a novel and versatile approach based on water‐soluble matrices to prepare flexible membranous metacomposites, which can be applied in wearable cloaking, thin‐film capacitors, and flexible and stretchable devices.

show abstract

Section: Resultssupporting

confidence: 62%

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Sun

Wang

Xin

et al. 2020

Macro Materials & Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…As the permittivity and permeability are two parameters representing the electromagnetic properties of materials, materials can be categorized by four regions according to the polarities of permittivity and permeability [10]. As shown in Fig.…”

Section: Fundamental Of Metamaterialsmentioning

confidence: 99%

Wireless Power Transfer Systems Using Metamaterials: A Review

Lee

Yoon

2020

IEEE Access

View full text Add to dashboard Cite

With the recent advancement and progress in the field of wireless power transfer (WPT), there is an ever increasing demand for high power transfer efficiency (PTE) of the WPT systems and improved transfer distance for the end-users. However, some existing WPT systems have limited PTE and transfer distance as they take the inductive coupling approach, where the PTE dramatically decreases as the distance between (Tx) and receiver (Rx) coils increases. Alternatively, magnetic resonance coupling (MRC) is used as a mid-range WPT approach, for which the insertion of metamaterials (MTMs) between Tx and Rx coils is exploited to improve efficiency. MTMs are artificially engineered materials that show uncommon electromagnetic properties, such as evanescent wave amplification and negative refractive characteristics, which could be utilized for the enhancement of PTE. In this paper, a comprehensive review on recent progresses in the MTM-based WPT systems is reported, where previously reported MTM-based WPT systems are compared in terms of various parameters such as configurations, operating frequencies, dimensions and PTE. Also, the PTEs of these systems were plotted as a function of the normalized transfer distance. This review is expected to provide an insight for understanding the trends of the MTM-based WPT systems and serve as a reference for researchers who work on WPT systems and their applications. INDEX TERMS Wireless power transfer (WPT), metamaterials (MTMs), power transfer efficiency (PTE), energy harvesting

show abstract

“…Meanwhile, compared with the high dielectric constant polymers such as polyvinylidene fluoride, PI has a lower loss, more excellent mechanical properties, and higher thermal stability. [37][38][39][40] Herein, the experimental realization of the tunable negative permittivity behavior in silica/multiwalled carbon nanotube/polyimide (SiO 2 /MWCNT/PI) composites was reported. Their magnitude of negative permittivity can be effectively controlled by adjusting the SiO 2 and MWCNT contents.…”

Section: Introductionmentioning

confidence: 99%

Epsilon-negative behavior and its capacitance enhancement effect on trilayer-structured polyimide–silica/multiwalled carbon nanotubes/polyimide–polyimide composites

Sun

Wang

et al. 2022

J. Mater. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

Random copper/yttrium iron garnet composites with tunable negative electromagnetic parameters prepared by in situ synthesis

Abstract: In this paper, the tunable negative permittivity and permeability of copper/yttrium iron garnet (Cu/YIG) composites, which were prepared by in situ synthesis process, were investigated in the radio frequency regime.

Cited by 49 publications

References 31 publications

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Wireless Power Transfer Systems Using Metamaterials: A Review

Epsilon-negative behavior and its capacitance enhancement effect on trilayer-structured polyimide–silica/multiwalled carbon nanotubes/polyimide–polyimide composites

Contact Info

Product

Resources

About