Flexible polystyrene/graphene composites with epsilon-near-zero properties

Zhang, Zheng; Liu, Mingxiang; Ibrahim, Mohamed M.; Wu, Haikun; Wu, Yan; Yang, Li; Mersal, Gaber A.M.; Azab, Islam H. El; El‐Bahy, Salah M.; Huang, Mina; Jiang, Yunxiao; Liang, Gemeng; Xie, Peitao; Liu, Chun-Zhao

doi:10.1007/s42114-022-00486-3

Cited by 187 publications

(55 citation statements)

References 61 publications

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“…[42] On the one hand, the interfacial polarization was generated when carriers were accumulated on the interface between PS and MWCNTs because of the differences in ©Engineered Science Publisher LLC 2022 | 11 conductivity, resulting in the micro-capacitors effect. [43] On the other hand, conductive MWCNTs and sandwich insulating PS matrix built micro-capacitors in films, leading to the equivalent micro-capacitor effect. [44] Interestingly, the ɛ′ decreased when MWCNTs content was further increased to 20 wt%, because the micro-capacitors effect was weakened with the increasing MWCNTs content to 20 wt%.…”

Section: Dielectric Properties Of Ps/mwcnts Filmsmentioning

confidence: 99%

Flexible and biocompatible polystyrene/multi-walled carbon nanotubes films with high permittivity and low loss

Wang¹

2022

ES Mater. Manuf.

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Percolative composites with high permittivity and low loss have drawn enormous attention in the research community, exhibiting wide range of applications in sensors, capacitors, field-effect transistors, antennas, etc. In this work, flexible and biocompatible polystyrene/multi-walled carbon nanotubes (PS/MWCNTs) films with high permittivity and low loss near percolation threshold were achieved by solution mixing assisted with non-solvent induced phase separation (NIPS) strategy and followed by the hot press method. Cytotoxicity experiments proved that the experimental process and products are green, environmentally friendly and biocompatible. The microstructure and dielectric properties were investigated. When MWCNTs content reached 15 wt%, high permittivity and low loss were simultaneously realized. Combining the flexibility and non-toxicity, the PS/MWCNTs films with high permittivity and low loss exhibit great potentials in wearable devices, skin sensors and flexible electronics.

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Section: Dielectric Properties Of Ps/mwcnts Filmsmentioning

confidence: 99%

Flexible and biocompatible polystyrene/multi-walled carbon nanotubes films with high permittivity and low loss

Wang¹

2022

ES Mater. Manuf.

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“…[1][2][3][4][5] To realize this possibility, electronic skin (e-skin) technology has rapidly evolved to overcome the gap between artificial and natural human skin in terms of its mechanical properties and tactile functions. Various researches on e-skin have been carried out to not only obtain the flexibility, [6][7][8][9][10] stretchability, [11] and selfhealing ability [12,13] of human skin, but also to implement tactile sensing abilities to detect stimuli such as pressure, [13,14] temperature, [13,[15][16][17] and humidity. [13,18,19] However, while state-of-the-art e-skin technologies have nearly achieved many of human skin properties and capabilities, [20,21] pressure sensing ability, which is considered as one of the primary capabilities of the skin, [22] is still limited in achieving actual skin-like performance, represented by high sensitivity and wide dynamic range.…”

Section: Introductionmentioning

confidence: 99%

Beyond Human Touch Perception: An Adaptive Robotic Skin Based on Gallium Microgranules for Pressure Sensory Augmentation

et al. 2022

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Robotic skin with human‐skin‐like sensing ability holds immense potential in various fields such as robotics, prosthetics, healthcare, and industries. To catch up with human skin, numerous studies are underway on pressure sensors integrated on robotic skin to improve the sensitivity and detection range. However, due to the trade‐off between them, existing pressure sensors have achieved only a single aspect, either high sensitivity or wide bandwidth. Here, an adaptive robotic skin is proposed that has both high sensitivity and broad bandwidth with an augmented pressure sensing ability beyond the human skin. A key for the adaptive robotic skin is a tunable pressure sensor built with uniform gallium microgranules embedded in an elastomer, which provides large tuning of the sensitivity and the bandwidth, excellent sensor‐to‐sensor uniformity, and high reliability. Through the mode conversion based on the solid–liquid phase transition of gallium microgranules, the sensor provides 97% higher sensitivity (16.97 kPa−1) in the soft mode and 262.5% wider bandwidth (≈1.45 MPa) in the rigid mode compared to the human skin. Successful demonstration of the adaptive robotic skin verifies its capabilities in sensing a wide spectrum of pressures ranging from subtle blood pulsation to body weight, suggesting broad use for various applications.

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“…Materials with negative permittivity in the radio frequency (RF) have attracted much attention in recent years due to their great potential applications in electronic devices such as electromagnetic stealth, capacitors, transistors, and antennas . In general, the negative permittivity in RF can be achieved by the plasma oscillation of conductors or the dielectric resonance of ferroelectric materials under an applied electric field. − In past reports, these two negative permittivity behaviors have mostly appeared in different materials, − and thus have been studied separately. For example, Shi et al prepared Ag/Al 2 O 3 composites and observed negative permittivity, which can be well described by the Drude model.…”

Section: Introductionmentioning

confidence: 99%

Negative Permittivity Behaviors Derived from Dielectric Resonance and Plasma Oscillation in Percolative Bismuth Ferrite/Silver Composites

Yang

Sun

et al. 2022

J. Phys. Chem. C

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Negative permittivity of materials can be obtained by plasma oscillation or dielectric resonance, but the relationship between these two negative permittivity behaviors has been neglected. Combining the advantages of two negative permittivity behaviors, the negative permittivity can be more tunable and is expected to realize epsilon-near-zero behavior. In this work, percolative bismuth ferrite/silver composites with different contents of Ag were successfully fabricated by a simple solid-state sintering method. With the addition of Ag, the Lorentz-like and Drude-like negative permittivity behaviors were successively observed in bismuth ferrite/silver composites. The reasons for the two types of negative permittivity behaviors are dielectric resonance and plasma oscillation, respectively. Further investigation revealed that the synergistic effect of dipole resonance and free electrons led to a change of resonance frequency, a decrease of magnitude, and a transition of two negative permittivity behaviors. Moreover, with the addition of Ag in percolative bismuth ferrite/silver composites, the electrical conductivity and thermal conductivity changed abruptly at a certain volume fraction, suggesting a percolation behavior.

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Flexible polystyrene/graphene composites with epsilon-near-zero properties

Cited by 187 publications

References 61 publications

Flexible and biocompatible polystyrene/multi-walled carbon nanotubes films with high permittivity and low loss

Flexible and biocompatible polystyrene/multi-walled carbon nanotubes films with high permittivity and low loss

Beyond Human Touch Perception: An Adaptive Robotic Skin Based on Gallium Microgranules for Pressure Sensory Augmentation

Negative Permittivity Behaviors Derived from Dielectric Resonance and Plasma Oscillation in Percolative Bismuth Ferrite/Silver Composites

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