Thermal conductivity of graphene and graphene oxide nanoplatelets

Mahanta, Nayandeep K.; Abramson, Alexis R.

doi:10.1109/itherm.2012.6231405

Cited by 79 publications

(50 citation statements)

References 17 publications

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“…While the graphite flakes used in this work were measured to have a thermal conductivity of 1442 6 176 W/m K, the graphene nanoplatelets only had a thermal conductivity of 776 6 96 W/m K as discussed elsewhere. 36,37 The thermal conductivities of the epoxy-graphitegraphene composites were measured using the dual-mode heat flow meter technique. 38 For this characterization method, the thermal conductivity of the sample is computed by monitoring the steady-state temperature gradient along the length of the sample.…”

Section: Thermal Conductivity Measurement Results and Discussionmentioning

confidence: 99%

Graphite–graphene hybrid filler system for high thermal conductivity of epoxy composites

et al. 2015

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The thermal conductivities of epoxy composites of mixtures of graphite and graphene in varying ratios were measured. Thermal characterization results showed unexpectedly high conductivities at a certain ratio filler ratio. This phenomenon was exhibited by samples with three different overall filler concentrations (graphene 1 graphite) of 7, 14, and 35 wt%. The highest thermal conductivity of 42.4 6 4.8 W/m K (nearly 250 times the thermal conductivity of pristine epoxy) was seen for a sample with 30 wt% graphite and 5 wt% graphene when characterized using the dual-mode heat flow meter technique. This significant improvement in thermal conductivity can be attributed to the lowering of overall thermal interface resistance due to small amounts of nanofillers (graphene) improving the thermal contact between the primary microfillers (graphite). The synergistic effect of this hybrid filler system is lost at higher loadings of the graphene relative to graphite. Graphite and graphene mixed in the ratio of 6:1 yielded the highest thermal conductivities at three different filler loadings.

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Section: Thermal Conductivity Measurement Results and Discussionmentioning

confidence: 99%

Graphite–graphene hybrid filler system for high thermal conductivity of epoxy composites

et al. 2015

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“…It can be seen that the thermal conductivity of neat MIL-101(Cr) is 0.05 W (m K) −1 at 303 K and it increased linearly to reach 0.103 W (m K) −1 at 473 K. The effect of the presence of graphene oxide at different ratios was also investigated. Despite the presence of the oxygen atoms, which typically enhance phonon scattering, the enhancement of the thermal conductivity observed can be attributed to the increase in the interlayer coupling due to interactions between the oxygen atom of the GrO and the MIL-101(Cr) framework [39].…”

Section: Thermal Conductivitymentioning

confidence: 99%

Development of MIL-101(Cr)/GrO composites for adsorption heat pump applications

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et al. 2017

Microporous and Mesoporous Materials

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Adsorption heat pumps can be used for generating heating, cooling, seasonal energy storage and water desalination applications. Metal-organic frameworks (MOFs) are hybrid porous materials with high surface area and superior adsorption characteristics compared to conventional adsorbents. MIL-101(Cr) has a large pore size with water vapour adsorption capacity up to 1.5 gH2O gads -1 and high cyclic stability thus has the potential to be used in adsorption heat pumps. This work investigates the enhancement of the thermal conductivity and water adsorption characteristics of MIL-101(Cr) using hydrophilic graphene oxide. Two methods have been used to develop MIL-101(Cr)/GrO composites. The first method was through physical mixing between MIL-101(Cr) and GrO while the other was through incorporating the GrO during the synthesis process of MIL-101(Cr). The composites and MIL-101(Cr) were characterized in terms of their structure, water adsorption uptake, BET surface area, particle size, thermal gravimetric analysis, SEM images and thermal conductivity measurements. Results showed that introducing low amounts of GrO (<2%) to the neat MIL-101(Cr) enhanced the water adsorption characteristics at high relative pressure but enhanced the heat transfer properties by 20-30% while using more than 2% of GrO reduced the water adsorption uptake but significantly enhanced the thermal conductivity by more than 2.5 times.

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“…It was shown that the multilayer graphene comprising 30-45 layers had a thermal conductivity similar to bulk graphite, whereas that of 3-layer GO was higher than that of bulk graphite. The enhancement in thermal conductivity of multilayer GO than graphite is attributed to the intercalating oxygen atoms that introduced covalent bridges between the interlayers for interaction [200]. Due to the intrinsic properties of the individual graphene sheets and the highly aligned structure of GO papers (GOPs) and graphene papers (GPs), these flexible materials also show unique thermal properties [204].…”

Section: Thermal Propertiesmentioning

confidence: 99%