Comparison of Few-layer Graphene Prepared from Natural Graphite through Fast Synthesis Approach

Kottegoda, I. R. M.; Gao, Xuan‐Wen; Nayanajith, L. D. C.; Manorathne, Chinthan H.; Wang, Jun; Wang, Jiazhao; Liu, Huan; Gofer, Yosef

doi:10.1016/j.jmst.2015.07.014

Cited by 26 publications

(13 citation statements)

References 29 publications

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“…The presence of carbon nanoparticles may explain the visible changes of the sample in black glass composite [36] . The results by SEM are given in Fig.…”

Section: Differential Thermal Analysismentioning

confidence: 99%

Boron Oxide Glasses and Nanocomposites: Synthetic, Structural and Statistical Approach

Hristov

Nedyalkova

Madurga

et al. 2017

Journal of Materials Science & Technology

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Organic-inorganic hybrid materials Borate glass Nanocomposites Cluster analysisThree different precursors of boron-aqua and glycerol solutions of boric acid and ethanol solution of trimethyl borate were used for the preparation of organic-inorganic advanced materials. The films and bulk materials samples were heat treated at 100, 400, 800°C for 2 h. The hybrid samples were stable and transparent until 100°C. The further increase of temperature to 400°C led to destruction of samples, and at 800°C they were molten. The structural changes during the pyrolysis were studied by Fourier transform infrared spectroscopy, differential thermal analysis, and X-ray diffraction. Details of surface morphology were observed by scanning electron microscopy. The obtained BO3 and BO4 groups were identified in the molten materials after pyrolysis. The quantities and order of borate structural units as well as residual carbon in the networks depended on boron precursor type. PVA/PEG/B2O3 hybrid materials were proved to be appropriate precursors for synthesizing borate and carboborate glass and carbon/borate glass nanocomposites. To access the impact of the experimental conditions on the structural changes of the nanocomposites, cluster analysis of the IR-spectral data was used as a classification method.

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“…The presence of carbon nanoparticles may explain the visible changes of the sample in black glass composite [36] . The results by SEM are given in Fig.…”

Section: Differential Thermal Analysismentioning

confidence: 99%

Boron Oxide Glasses and Nanocomposites: Synthetic, Structural and Statistical Approach

Hristov

Nedyalkova

Madurga

et al. 2017

Journal of Materials Science & Technology

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“…Nano-rReduced graphene oxide was obtained from graphene oxide. 14,15 graphene oxide -was prepared via the Hummers' method. 16 PBAT (Ecoflex®, density 1.26 gcm-3), was obtained from Polymer Packaging (Pvt.)…”

Section: Experimental Materialsmentioning

confidence: 99%

Evaluation of Conducting and Tensile Properties of Reduced Graphene Oxide/ Polybutylene Adipate Terephthalate (Rgo/Pbat) Nanocomposites

Nayanajith

Silva

Rosa

et al. 2022

Mat. Sci. Res. India

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This study was focused on evaluation of conducting and tensile properties of rGO/ Polybutylene adipate terephthalate (PBAT) nanocomposite intended to use in electronic applications which require biodegradability. This study was also considered to be worthwhile since very little work has been done in this regard so far. PBAT was specifically selected for the study as it is an extensively used biodegradable polymer for variety of applications. The solvent casting method was employed to prepare rGO/PBAT nanocomposites where rGO was dispersed in a solution of PBAT by ultrasonication followed by evaporation of the solvent components. Electrical conductivity (σ) of rGO/PBAT nanocomposites showed a percolation behavior as rGO content was increased from the 0.5 % to 1.5 % (σ increased drastically with the increase of rGO content). The percolation threshold was approximately 0.0045, (i.e., 0.75 w/w % of rGO). The average critical exponent (t) related to the percolation theory was 1.49 ± 0.19 which is well within the expected range 1< t < 2. According to impedance studies, the electrical impedance of GO/PBAT composites decreased with the increasing rGO content, which agreed well with the behavior of the electrical conductivity investigated previously. The same equivalent circuit was shown by each composite except the values for constant phase element CPE and resistor R; the equivalent electrical circuit was a parallel combination of CPE and R. The dielectric analysis of the composites indicated that dielectric parameters ϵ”, ϵ’ and dissipation factor increased significantly with increasing rGO content. The tensile strength of the composites was better than that of neat PBAT up to 1.5 % of rGO loading and decreased on further increasing of rGO. However, their tensile strain at break decreased with increasing rGO content. The results indicated that PBAT/rGO polymer composite is promising candidate for various electronic applications.

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“…High-quality Sri Lankan graphite stands out as a key raw material in manufacturing high-end technical products such as micro-processors, integrated circuits, electronic and optoelectronic devices. Several studies have also been done to identify its potential as anode material for Li-ion batteries [2,3]. However, Sri Lanka has been exporting bulk quantities of high purity raw graphite without any value addition since 19 th century resulting in heavy revenue losses and faster depletion rate of graphite deposits.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the oxidation time has been varied from 30 minutes to one hour keeping the oxidation temperature often fixed at 35 °C [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Since Kahatagaha graphite is specific in some characteristics as aforesaid, in order to acquire the optimum level of yield and quality of GO, the oxidation time was studied by varying from one hour to six hours while maintaining the other process parameters as in the original Hummers' method [3]. Similar to GO, rGO is also a value-added product.…”

Section: Introductionmentioning

confidence: 99%

Optimization of oxidation time of Kahatagaha vein graphite and reduction time of microwave assisted hydrothermal reduction of Kahatagaha graphene oxide

et al. 2022

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The present study was aimed to obtain the optimum yield of graphene oxide (GO) from Kahatagaha graphite by optimizing oxidation time, and to effectively utilize hydrothermal microwave irradiation technique to produce high quality reduced graphene oxide (rGO) with the optimum level of reduction from Kahatagaha graphene oxide. Kahatagaha vein graphite was specifically selected for the study due to its remarkable morphological, structural, compositional and carbon isotropic variations from the other types of graphite. Oxidation time of Kahatagaha graphite was optimized and subsequently, microwave irradiation time was optimized to obtain maximumly reduced graphene oxide from the synthesized GO. XRD, SEM, FTIR and gravimetric analyses were employed to characterize the synthesized GO and rGO. The optimized oxidation time for the complete conversion of Kahatagaha graphite to GO was 5 hours that resulted in a yield of 170 % (w/w) with respect to the amount of graphite used. This level of yield would be highly beneficial for commercial productions of GO. The maximum level reduction of GO (production of rGO) was achieved in 20 minutes _________________________________________________________________________

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Comparison of Few-layer Graphene Prepared from Natural Graphite through Fast Synthesis Approach

Cited by 26 publications

References 29 publications

Boron Oxide Glasses and Nanocomposites: Synthetic, Structural and Statistical Approach

Boron Oxide Glasses and Nanocomposites: Synthetic, Structural and Statistical Approach

Evaluation of Conducting and Tensile Properties of Reduced Graphene Oxide/ Polybutylene Adipate Terephthalate (Rgo/Pbat) Nanocomposites

Optimization of oxidation time of Kahatagaha vein graphite and reduction time of microwave assisted hydrothermal reduction of Kahatagaha graphene oxide

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