Maxwell–Wagner–Sillars mechanism in the frequency dependence of electrical conductivity and dielectric permittivity of graphene-polymer nanocomposites

Xia, Xiaodong; Zhong, Zheng; Weng, George J.

doi:10.1016/j.mechmat.2017.03.014

Cited by 131 publications

(79 citation statements)

References 45 publications

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“…However, the recorded dielectric analysis gives a rather low dielectric constant and dissipation factor, which is independent of the measured frequency. At low rGO content, the lamellar LDPE is capsulated or segregated with the layered rGO, causing the interfacial polarization to become weak . Yet, in this study, rGO content up to 1.0 wt% has an appreciable effect on dielectric properties and a 50% enhancement in the dielectric constant for 1.0 wt% LEPD/rGO is obtained when compared with neat LDPE.…”

Section: Resultsmentioning

confidence: 58%

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Toh

Ong

Bindumadhavan

et al. 2018

Polymer International

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The variation in physicochemical properties on incorporation of unmodified reduced graphite oxide (rGO) into a low‐density polyethylene (LDPE) matrix has received much attention. Herein, a simple method is developed for the fabrication of LDPE/rGO nanocomposites using a solvent casting method. The UV‐visible spectra showed that addition of rGO can effectively cut off the short‐wavelength UV‐B light, which resists the occurrence of photoreaction. The stiffness of the LDPE/rGO nanocomposites was improved by 45% with an increase of modulus of elasticity as the rGO content increases. This is slightly opposite to the small decrease of the nanocomposite tensile strength. The addition of rGO to LDPE improved the thermal stability and degree of crystallization of LDPE/rGO nanocomposites when the rGO content increases from 0.025 to 1 wt%. The gas barrier property was also improved by 26% with 0.3 wt% of rGO. The dielectric property of the LDPE/rGO nanocomposites was also evaluated for industrial electronics application and the dielectric constant increases 50% compared with the neat LDPE when 0.1–1 wt% rGO was added. Results obtained clearly indicate the feasibility of using unmodified rGO to improve the properties of LDPE matrix for meeting the performance requirements for intended use in packaging industries. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 58%

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Toh

Ong

Bindumadhavan

et al. 2018

Polymer International

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“…As the energy storage capacity of these materials is the key for utilization in energy generating devices, significant interest has been shown in the analysis of dielectric properties of various PNCs [82]. Also, the chain interactions and the polarity of the host polymer may affect the interface between the polymer matrix and the NPs defined as the accumulation of charge carriers at the interface between the polymer matrix and the nanofiller [84,85]. At higher frequency, the interfacial dipoles do not have enough time to align themselves in the direction of an applied electric field [53,86,87].…”

Section: Dielectric Studiesmentioning

confidence: 99%

Enhanced dielectric properties of green synthesized Nickel Sulphide (NiS) nanoparticles integrated polyvinylalcohol nanocomposites*

Reddy

Deshmukh

Kovařík

et al. 2020

Mater. Res. Express

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A green synthesis approach has been adopted to prepare nickel sulphide nanoparticles (NiS NPs) using banana peel extract (BPE) as a reducing and capping agent. Polyvinyl alcohol (PVA)/NiS nanocomposite films were fabricated using a cost-effective solution casting technique by dispersing different contents of NiS NPs (0-3 wt%) in the PVA matrix. Various characterization techniques were employed to analyze the structural, thermal and morphological properties of the PVA/NiS nanocomposite films. Further, the dielectric behaviour of these nanocomposite films was investigated at frequency range 50 Hz-20 MHz and in the temperature range 40°C-140°C. Also, there exists a significant interaction between the polymer matrix and the nanofiller as evident from the notable improvement in the dielectric properties of the nanocomposites. The dielectric constant (ε) value of PVA/NiS nanocomposite film with 3 wt % NiS NPs loading was found to be 154.55 at 50 Hz and at 140°C which is 22 times greater than the dielectric constant value of neat PVA (6.90). These results suggest that NiS NPs were dispersed homogeneously in the PVA matrix.Among various polymers used for the fabrication of PNCs, polyvinyl alcohol (PVA) is most often preferred as a host matrix owing to its excellent film-forming ability, higher dielectric strength, the capability to form strong hydrogen bonding, easy processability, excellent chemical stability, and highly durable nature [17]. PVA has been employed for various applications such as in battery components, packaging, textile applications in the microelectronic industry, electromagnetic interference applications and so on [17,18]. Several research groups reported the dielectric properties of the PVA based nanocomposites [19][20][21]. With this inspiration, in the present study PVA has been chosen as a host polymer to synthesize PVA based nanocomposites. Now a day, more attention has been focussed on metal sulphide nanostructures because of their unique properties and applications [22]. Among these, nickel sulphide (NiS) has been mostly investigated because of its simple production, affordable price and high electronic conductivity [23,24]. It exhibits complicated electrical, optical, structural, compositional and magnetic phase behaviour [25]. Also due to the possession of multi-phases, binary Ni-S systems such as NiS 2 , Ni 3 S 4 , Ni 9 S 8 , Ni 7 S 6 , Ni 6 S 5 , Ni 4 S 3+x , Ni 3 S 2 , and Ni 3+x S 2 have become fascinated materials [26]. NiS NPs exhibit different shapes such as layer-rolled structures, urchin-like nanocrystallites, flower-like architectures, hollow spheres, nanoframes, nanorods, and nanospheres etc [27,28].Recently, increased attention has been given to the green approach for the synthesis of NPs because of its several advantages [29][30][31][32]. For the synthesis of NPs, the plant extracts which serve as reducing/capping agents are considered to be more beneficial than remaining techniques [33]. Several researchers reported the synthesis of metal sulphide NPs through a green synthesis a...

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“…One of the solutions that we will suggest to explore using deposition by spray-gun is to fabricate stacked alternating layers of dielectric and graphene. Thank to that, we want to exploit the Maxwell-Wagner-Sillars (MWS) phenomenon [53][54][55], i.e. polarization effects at the interface between the conductive materials (graphene sheets) and dielectric materials (e.g.…”

Section: Carbon-based Non-volatile Memories By Spray-gun Depositionmentioning

confidence: 99%

Deposition of graphene and related nanomaterials by dynamic spray-gun method: a new route to implement nanomaterials in real applications

Bondavalli

Pribat

Legagneux³

et al. 2019

J. Phys. Mater.

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The dynamic spray-gun deposition method was developed in 2006 to fabricate field effect transistors based on random arrays of carbon nanotubes (CNTs) field effect transistors for gas sensing applications. Thanks to this deposition method, we were able to fabricate hundreds of operational devices in a reproducible way that were integrated in electronic chips. Following this first implementation, we decided to widen the application of the deposition technique to the field of Energy and specifically to the fabrication of supercapacitors. In this context, we demonstrated in 2012 the fabrication of nanostructured electrodes for supercapacitors, using mixtures of graphene/graphite and CNTs increasing the device capacitance and the power delivered of a factor 2.5 compared to CNT based electrochemical-double-layer-capacitors. Indeed, with high quality graphene we could reach a value of around 100 W Kg −1 . This value is extremely promising also considering that it has been obtained with an industrially suitable technique. This dynamic spray-gun deposition has been also exploited for the fabrication of resistance based random access memories, making use of thin layers of graphene oxide and of oxidized carbon nanofibers. In the first case, 5000 cycles of 'write' and 'read' phases were demonstrated. These results pave the way for the fabrication of very low cost memories that can be embedded in smart-cards, patches for health monitoring (e.g. diabetes), ID cards, RFID tags and more generally smart packaging. Finally we are also working on the utilization of this technique for the fabrication of layers for electro-magnetic interference shielding application. Thanks to a new machine with four nozzles, developed within the frame of the Graphene Flagship project, we are able to deposit four different nanomaterials at the same time or alternatively on a large surface (30 cm×30 cm) creating specific nano-structuration and therefore ad hoc architectures allowing the smart absorption of specific frequencies (e.g. X-band). All these applications demonstrate the extreme versatility of this technique that constitutes a real breakthrough for exploiting the nanomaterials characteristics in real devices, using an industrial suitable fabrication method that can be implemented using roll-to-roll technique.

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Maxwell–Wagner–Sillars mechanism in the frequency dependence of electrical conductivity and dielectric permittivity of graphene-polymer nanocomposites

Cited by 131 publications

References 45 publications

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Physicochemical properties of reduced graphite oxide conglomerated polyethylene nanocomposites

Enhanced dielectric properties of green synthesized Nickel Sulphide (NiS) nanoparticles integrated polyvinylalcohol nanocomposites*

Deposition of graphene and related nanomaterials by dynamic spray-gun method: a new route to implement nanomaterials in real applications

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