The effect of the thermal reduction temperature on the structure and sorption capacity of reduced graphene oxide materials

Долбин, А. В.; Khlistyuck, M. V.; Esel'son, V. B.; Gavrilko, V. G.; Vinnikov, N. A.; Basnukaeva, R. M.; Maluenda, Irene; Maser, Wolfgang K.; Benito, Ana M.

doi:10.1016/j.apsusc.2015.11.167

Cited by 91 publications

(47 citation statements)

References 34 publications

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“…The effect of the annealing temperatures upon the structural characteristics of GtO, was investigated by the X-ray diffraction (XRD) method in Cu-K  radiation using a DRON-3 diffractometer. The obtained XRD patterns ( Fig.1) are similar qualitatively to those in [26] but for a few distinctions (a detailed analysis and a comparison of the XRD patterns with other data were rather difficult because of the lack of quantitative data processing in [26]). It is seen that oxidation causes serious damage to the graphite structure ( Fig.…”

Section: Samples and Their Characterization By The X-ray Diffraction supporting

confidence: 54%

“…The resulting product was then thermally treated under Ar atmosphere to prepare thermally reduced graphene oxide (TRGO). Five samples were obtained by heating the starting GtO material at 200, 300, 500, 700 and 900 o C, respectively [26]. The GtO and reduced TRGO samples were powders with an average grain size about 10 μm, the mass of each sample was ~40 mg.…”

Section: Samples and Their Characterization By The X-ray Diffraction mentioning

confidence: 99%

“…At T>900 o C the carbon phase is almost completely reduced, the O 2 contents being below 3% (see Fig.8). data of [16] data of [26] O% C%…”

Section: Samples and Their Characterization By The X-ray Diffraction mentioning

confidence: 99%

“…2)) of diffusion close to the 2D case was taken to be equal to ~4. The activation energy Ea of 4 He diffusion in GO was estimated by plotting the temperature dependence of the diffusion coefficients in the Y=ln(D) -X=1/T coordinates (see According to XRD (see this study, section 2) and Raman spectroscopy [26] data, heating to T=200 0 C causes intensive evaporation of the water intercalated in the interplanar space of carbon and 'exfoliation' of the GO sheets into individual flakes [15]. The number of the interlayer cavities decreases and the influence of the other cavity wall on the 4 He atoms diminishes significantly.…”

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The effect of the thermal reduction on the kinetics of low-temperature 4He sorption and the structural characteristics of graphene oxide

Долбин

Khlistuck

Esel'son

et al. 2017

Low Temperature Physics

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The kinetics of the sorption and the subsequent desorption of 4 He by the starting graphite oxide (GtO) and the thermally reduced graphene oxide samples (TRGO, T reduction = 200, 300, 500, 700 and 900 0 C) have been investigated in the temperature interval 1.5 -20 K. The effect of the annealing temperature on the structural characteristics of the samples was examined by the X-ray diffraction (XRD) technique. On lowering the temperature from 20 K to 11-12 K, the time of 4 He sorption increased for all the samples, which is typically observed under the condition of thermally activated diffusion. Below 5 K the characteristic times of 4 He sorption by the GtO and TRGO-200 samples were only weakly dependent on temperature, suggesting the dominance of the tunnel mechanism. In the same region (T<5 K) the characteristic times of the TRGOs reduced at higher temperatures (300, 500, 700 and 900 0 C) were growing with lowering temperature, presumably due to the defects generated in the carbon planes on removing the oxygen functional groups (oFGs). The estimates of the activation energy (E a ) of 4 He diffusion show that in the TRGO-200 sample the E a -value is 2.9 times lower as compared to the parent GtO, which is accounted for by GtO exfoliation due to evaporation of the water intercalated in the interlayer space of carbon. The nonmonotonic dependences Ea(T) for the GtO samples treated above 200 o C are determined by a competition between two processes -the recovery of the graphite carbon structure, which increases the activation energy, and the generation of defects, which decreases the activation energy by opening additional surface areas and ways for 2 sorption. The dependence of the activation energy on T treatment correlates well with the contents of the crystalline phase in GtO varying with a rise of the annealing temperature.

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Section: Samples and Their Characterization By The X-ray Diffraction supporting

confidence: 54%

Section: Samples and Their Characterization By The X-ray Diffraction mentioning

confidence: 99%

“…At T>900 o C the carbon phase is almost completely reduced, the O 2 contents being below 3% (see Fig.8). data of [16] data of [26] O% C%…”

Section: Samples and Their Characterization By The X-ray Diffraction mentioning

confidence: 99%

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confidence: 99%

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The effect of the thermal reduction on the kinetics of low-temperature 4He sorption and the structural characteristics of graphene oxide

Долбин

Khlistuck

Esel'son

et al. 2017

Low Temperature Physics

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“…However, the thermal transfer properties of graphene‐reinforced epoxy composites can be severely weakened by the agglomeration of graphene, which would result in poor dispersion of graphene in the epoxy matrix and high thermal interface resistance ( R TIM ) in the resulting composites . Therefore, graphene dispersion in an epoxy matrix and interface compatibility between graphene and the epoxy matrix are the key issues for the application of thermally conductive composites …”

Section: Introductionmentioning

confidence: 99%

Tailored interphase and thermal interface resistance of self‐assembled thermally reduced graphene oxide–polyamide hybrid/epoxy composites with enhanced thermal conductivity

et al. 2019

J of Applied Polymer Sci

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Thermally reduced graphene oxide–polyamide (TrGO‐PA) hybrids were fabricated by self‐assembly between TrGO nanosheets and PA microparticles, and the dispersibility, interphase extension, and thermal conduction mechanism of TrGO‐PA/epoxy (EP) composites were investigated. Most of the oxygen‐containing functional groups of TrGO were removed, and a conjugated structure of graphene was recovered. TrGO was distributed evenly on the PA surface via electrostatic adsorption between TrGO and PA, which resulted in the inhibition of TrGO aggregation in the epoxy matrix. Compared with that of TrGO/EP and PA/EP composites, the thermal interface resistance (RTIM) of TrGO‐PA/EP composites was greatly decreased to 38.3 mm2 kW−1 and the thermal conductivity was improved to 0.268 W/(m K), which was attributed to the enhanced dispersibility of TrGO‐PA and the enlarged interphase in TrGO‐PA/EP composites. A schematic model of thermal conduction mechanisms was proposed based on the formation of contiguous thermal transfer pathways by bridged TrGO adsorbed on well‐dispersed PA microparticles in TrGO‐PA/EP composites. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47826.

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Laser Direct‐Writing Graphene Oxide to Graphene—Mechanisms to Applications

Arul

Oosterbeek

Mallett

et al. 2019

Handbook of Graphene

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The effect of the thermal reduction temperature on the structure and sorption capacity of reduced graphene oxide materials

Cited by 91 publications

References 34 publications

The effect of the thermal reduction on the kinetics of low-temperature 4He sorption and the structural characteristics of graphene oxide

The effect of the thermal reduction on the kinetics of low-temperature 4He sorption and the structural characteristics of graphene oxide

Tailored interphase and thermal interface resistance of self‐assembled thermally reduced graphene oxide–polyamide hybrid/epoxy composites with enhanced thermal conductivity

Laser Direct‐Writing Graphene Oxide to Graphene—Mechanisms to Applications

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