Polyvinyl alcohol/carbon fibers composites with tunable negative permittivity behavior

Sun, Kai; Qin, Jinyuan; Wang, Zongxiang; An, Yan; Li, Xiaofeng; Dong, Binbin; Wu, Xinfeng; Guo, Zhanhu; Fan, Runhua

doi:10.1016/j.surfin.2020.100735

Cited by 33 publications

(12 citation statements)

References 55 publications

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“…The main reason is the introduction of MWCNTs, with the transition of electrons in the composites from hopping conduction to metal-like conduction. [43][44][45][46] Indeed, such mitigated electrical conduction indicates the important role of insulating SiO 2 particles as effective impediments for the tunneling of electrons. Meanwhile, the AC conductivity of single-layer composites has very little dependence on frequency.…”

Section: Resultsmentioning

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

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Section: Resultsmentioning

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

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“…With the AgNWs content increasing as shown in Figure 2B,D, the AgNWs are evenly distributed in the PVDF matrix and further strengthen the percolation networks, which can provide pathways for the transportation of free electrons. [ 31,32 ]…”

Section: Resultsmentioning

confidence: 99%

Low‐loss percolative epsilon‐negative composites derived from the ultra‐low percolation threshold

et al. 2022

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In this work, the mechanism of negative permittivity response with low losses in the silver nanowires/polyvinylidene fluoride composites were demonstrated.Due to the large aspect ratios of silver nanowires, ultra-low percolation threshold (f c ) between 0.7 and 0.8 wt% was achieved with the losses effectively decreased by several orders of magnitude down to a low level of about 0.2. The negative permittivity response from Lorentz type and Drude type presented the transition from insulator to conductor. The tunable Drude type negative per-

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“…The dielectric properties of CFS/PVA composites were discussed as above. The PVA of insulation property was introduced into the CFS skeleton to realize the regulation of weak negative dielectric properties by changing the electron concentration [30]. In this paper, the innovation is reflected in the introduction of AgNWs with strong conductivity on the basis of CFS, which makes it easier to form a conductive network with increased electron concentration, so as to study the regulation of dielectric properties.…”

Section: Resultsmentioning

confidence: 99%

Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior

Qin

Sun

et al. 2021

EPJ Appl. Metamat.

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With the development of periodic metamaterials, more attention has been paid to negative permittivity behavior due to great potential applications. In this paper, silver nanowires (AgNWs) were introduced to the porous carbon fibers (CFS) by an impregnation process to prepare CFS/AgNWs composites with different content of AgNWs and the dielectric property was investigated. With the formation of conductive network, the Drude-like negative permittivity was observed in CFS/AgNWs composites. With the increase of AgNWs, the connectivity of conductive network became enhanced, the conductivity gradually increases, and the absolute value of the negative dielectric constant also increases to 8.9 × 104, which was ascribed to the enhancement of electron density of the composite material. Further investigation revealed that the inductive characteristic was responsible for the negative permittivity.

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Polyvinyl alcohol/carbon fibers composites with tunable negative permittivity behavior

Cited by 33 publications

References 55 publications

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

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

Low‐loss percolative epsilon‐negative composites derived from the ultra‐low percolation threshold

Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior

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