The effect of graphene flake size on the properties of graphene‐based polymer composite films

Tarhini, Ali; Tehrani‐Bagha, Ali Reza; Kazan, M.; Grady, Brian P.

doi:10.1002/app.49821

Cited by 33 publications

(22 citation statements)

References 33 publications

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“…Figure 4 shows the EC values of PC-Gn films as a function of temperature from 25 to 125 C. Enhanced EC was achieved with higher graphene wt% in the composites where graphene composites with 20 wt% achieved the highest EC 4445 S/m at 25 C and this EC corresponds to a major improvement from the EC for pure PVDF-HFP. 32 PVDF-HFP, like other polymers, is an electrical insulator with a very low EC which is around 10 À14 (S/m), and this obtained EC value of the composites corresponds to a huge enhancement of 17 orders of magnitude making these composites comparable to conductive metals. 30 This improvement is attributed to many factors including (a) using pure conductive fillers of graphene flakes (i.e., graphene with 98.5% purity), (b) the dispersion of the graphene flakes across the polymer composites as shown in the SEM images in Figure 1, (c) the good integration between the polymer matrix PVDF-HFP and graphene flakes as shown in DMA results in Figure 3, (d) graphene flakes were stacked on top of each other due to the slow gravitational settling of the graphene in PVDF-HFP matrix during the slow solvent evaporation process.…”

Section: Graphene-based Composite Film Characterization Techniquesmentioning

confidence: 78%

“…The thermal conductivity values for the PC-Gn samples were measured using optothermal Raman (OTR) spectroscopy as described in our previous publications. 14,32 A Raman spectrometer with a backscattering configuration and a green laser of an excitation wavelength λ = 532 nm was used to perform the thermal conductivity measurements. For this measurement, the laser generates energy in a micron-sized region, and the Raman signal, namely the G-peak of the graphene Raman signal, which is a strong function of temperature, measures the temperature in the heated region.…”

Section: Graphene-based Composite Film Characterization Techniquesmentioning

confidence: 99%

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The effect of temperature on the electrical and thermal conductivity of graphene‐based polymer composite films

Tarhini

Alchamaa

Khraiche

et al. 2021

J of Applied Polymer Sci

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In this work, we studied the effect of temperature on the electrical, thermal, and mechanical properties of graphene-based poly(vinylidene fluoride-cohexafluoropropylene) composites. Graphene-based polymer composites (PC-Gn) with various graphene content were prepared using solution mixing and molding process. The physical, chemical, and mechanical properties of the PC-Gn composites were investigated using different characterization techniques including differential scanning calorimetry, scanning electron microscopy, potentiostatic electrochemical impedance spectroscopy, and dynamic mechanical analysis (DMA). DMA results showed that the strength of obtained PC-Gn composites increased with higher graphene wt%. The in-plane electrical and thermal conductivity values were measured over a temperature range from 25 to 125 C using a four-point probe electrical conductivity system and optothermal Raman technique, respectively. Our results showed that temperature had a noticeable effect on the in-plane electrical and thermal conductivity values for PC-Gn where both values gradually decreased by the increment of temperature.We believe that by increasing temperature, the vibration of composite particles became more severe, which increased the system's anharmonicity and strongly reduced the lifetimes of electrons and phonons in the composite. Further analysis, including electrochemical analysis, was also done on all composite films showing that our process produced highly conductive films that potentially can be used in many electrochemical applications in the future.applications, conducting polymers, thermal properties | INTRODUCTIONGraphene, a one-atom-thick two-dimensional honeycomb network of carbon atoms, has a very large specific surface area of 2600 m 2 /g and very high mechanical, thermal, and electrical properties. 1 The in-plane thermal conductivity of a single layer of graphene is very high and is around 3080-5150 W/mK at room temperature. 2

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Section: Graphene-based Composite Film Characterization Techniquesmentioning

confidence: 78%

Section: Graphene-based Composite Film Characterization Techniquesmentioning

confidence: 99%

The effect of temperature on the electrical and thermal conductivity of graphene‐based polymer composite films

Tarhini

Alchamaa

Khraiche

et al. 2021

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, the composites showed high strength with compressive stress about 80% with strain 0.22 MPa. Graphene concentrations in poly(vinylidene fluoride-co-hexafluoropropylene)–graphene composites are responsible for the increases in conductivities and elasticity values [ 169 ]. Ultra-high in-plane electrical conductivity, in-plane thermal conductivity, and tensile strength were measured at ~4500 S/m, ~26 W/m/K, and ~50 MPa, respectively.…”

Section: Graphene–polymer Composites and Their Propertiesmentioning

confidence: 99%

Recent Studies on Dispersion of Graphene–Polymer Composites

2021

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Graphene is an excellent 2D material that has extraordinary properties such as high surface area, electron mobility, conductivity, and high light transmission. Polymer composites are used in many applications in place of polymers. In recent years, the development of stable graphene dispersions with high graphene concentrations has attracted great attention due to their applications in energy, bio-fields, and so forth. Thus, this review essentially discusses the preparation of stable graphene–polymer composites/dispersions. Discussion on existing methods of preparing graphene is included with their merits and demerits. Among existing methods, mechanical exfoliation is widely used for the preparation of stable graphene dispersion, the theoretical background of this method is discussed briefly. Solvents, surfactants, and polymers that are used for dispersing graphene and the factors to be considered while preparing stable graphene dispersions are discussed in detail. Further, the direct applications of stable graphene dispersions are discussed briefly. Finally, a summary and prospects for the development of stable graphene dispersions are proposed.

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“…Carbon-based material such as CNT, graphene, and nitride-based material such as boron nitride has many properties to enhance composite material's basic and functional properties [16][17][18]. In recent days, various ceramic materials have been added to epoxy resin to fabricate electrically insulative epoxy-based polymer matrix composites [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene Oxide-Boron Nitride-Based Dual Fillers on Mechanical Behavior of Epoxy/Glass Fiber Composites

Kavimani

Gopal

Stalin³

et al. 2021

Journal of Nanomaterials

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Graphene and its derivatives have excellent properties such as high surface area, thermal, and mechanical strength, and this fact made the researchers promote them as the possible filler material for fiber-matrix composite. The current research deals with validation on the effect of graphene oxide boron nitride filler over mechanical and thermal stability of epoxy glass fiber polymer matrix composite. The objective of this experimental investigation is to develop glass fiber reinforced polymer composites with hybrid filler addition. The matrix material selected is epoxy resin, whereas the glass fiber is selected as reinforcement, while boron nitride and graphene oxide are chosen as fillers. Compression moulding methodology is followed to develop the composites with the constant percentage of fiber loading, graphene oxide filler, and varying boron nitride content from 0 to 3 wt.% at an equal interval of 1 wt.%. The developed composite is analyzed for mechanical properties, and the fractured surface is analyzed through the scanning electron microscope. The addition of hybrid fillers enhances the fiber-matrix bonding strength and improves the thermal and mechanical properties up to a specific limit. Thermal gravimetric analysis was conducted to understand the thermal behavior of composite. The results revealed that the addition of filler improved the thermal stability of the composites.

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The effect of graphene flake size on the properties of graphene‐based polymer composite films

Cited by 33 publications

References 33 publications

The effect of temperature on the electrical and thermal conductivity of graphene‐based polymer composite films

The effect of temperature on the electrical and thermal conductivity of graphene‐based polymer composite films

Recent Studies on Dispersion of Graphene–Polymer Composites

Effect of Graphene Oxide-Boron Nitride-Based Dual Fillers on Mechanical Behavior of Epoxy/Glass Fiber Composites

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