Few Layer Graphene Derived from Wet Ball Milling of Expanded Graphite and Few Layer Graphene Based Polymer Composite

Borah, Munindra; Dahiya, Minakashi; Sharma, Shaveta; Mathur, R.B.; Dhakate, Sanjay R.

doi:10.1166/mat.2014.1185

Cited by 24 publications

(13 citation statements)

References 47 publications

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“…On the other hand, XRD of all the nanocomposites reveal the presence of graphene peak (at 2q z 26. clearly reveals the lattice fringes corresponding to graphene. 81 Fig . 2 shows the Raman spectra of GNS, Mg 3 Sb 2 and Mg 3 Sb 2 / GNS nanocomposite for mass ratio 80 : 1.…”

Section: Resultsmentioning

confidence: 99%

Graphene boosts thermoelectric performance of a Zintl phase compound

et al. 2015

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The concept of nanocomposites derived by incorporating a second minor phase in bulk thermoelectric materials has established itself as an effective paradigm for optimizing high thermoelectric performance.In this work, this paradigm is for the first time extended to bulk Zintl phase Mg 3 Sb 2 and its isoelectronically Bi-doped derivative Mg 3 Sb 1.8 Bi 0.2 system. Herein, we report the synthesis, microstructural details, electronic structure and thermoelectric properties of (Mg 3 Sb 2 , Mg 3 Sb 1.8 Bi 0.2 )/ graphene nanosheet (GNS) nanocomposites with different mass ratios. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) investigation reveals that Mg 3 Sb 2 nanoparticles are homogenously anchored on the surface of GNS. We demonstrate that Mg 3 Sb 2 -based materials incorporated with a small content of graphene outperform optimally, resulting in potential ptype thermoelectric materials. The present nanocomposite additive of GNS deriving such a novel nanocomposite of (Mg 3 Sb 2 , Mg 3 Sb 1.8 Bi 0.2 )/GNS, enhances the electrical conductivity significantly, thereby resulting in a substantially large increase in the power factor. The enhanced electrical conductivity of these nanocomposites is attributed to the increase in the carrier concentration and high carrier mobility owing to the ultra high mobility of graphene. X-ray photoelectron spectroscopy (XPS) core level spectra confirm weak bonding between GNS and Mg 3 Sb 2 . Increase in carrier concentration is reflected in XPS valence band spectra and change in spectral weight near valence band maxima is indicative of increased electrical conductivity in the nanocomposite material. The thermal conductivity of these nanocomposites is noted to be reduced at high temperature. These favorable conditions lead to enhanced thermoelectric figure-of-merit (ZT) z 0.71 at 773 K for Mg 3 Sb 2 /GNS and a ZT z 1.35 at 773 K for Mg 3 Sb 1.8 Bi 0.2 /GNS nanocomposites with the mass ratio of 80 : 1 which are $170% and $125% higher values compared to bare Mg 3 Sb 2 and bare Mg 3 Sb 1.8 Bi 0.2 respectively. We strongly believe that the present novel strategy of fabricating such a nanocomposite of a Zintl compound by utilizing GNS as a nanocomposite additive, may provide an emerging path for improving thermoelectric properties of various Zintl phase compounds.

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Section: Resultsmentioning

confidence: 99%

Graphene boosts thermoelectric performance of a Zintl phase compound

et al. 2015

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“…[23][24][25][26] The ball milling method has characteristics such as simple preparation process, energy saving and environmental benign for massively production. 27 The ECG was further grafted with the oleophilic oleylamine molecule to prepare edge-oleyaminated graphene (EOG). Oleylamine is selected as functional group for its thermal stability and miscibility with various oils.…”

Section: Research Papermentioning

confidence: 99%

Edge Oleylaminated Graphene as Ultra-Stable Lubricant Additive for Friction and Wear Reduction

Zhao¹,

Niu²,

Peng³

et al. 2020

Eng. Sci.

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Graphene has caught growing interest in the field of lubricant additives for its lubricating and antifraying effect. However, the critical agglomeration and sedimentation of graphene particles strongly impede its industrial applications. Here, we proposed a facile way to massively prepare edge-oleylaminated graphene (EOG) via ball milling method. The EOG was well dispersed in lubricant and showed longer than 8 months stability for its extremely thin structures and strong affinity with lubricant. The viscosity index (VI) of base lubricant was greatly improved from 81 to 119 by adding an optimized EOG amount of 0.1 wt.%. Besides, the wear scar diameter (WSD) decreased from 0.88 to 0.46 mm, while the maximum nonseizure load (P B) and the sintering load (P D) increased 64.86% and 56.18%, respectively. The enhanced VI indicates EOG additive could upgrade the base oil from normal grade to special grade. The obvious improvement of wear resistance and load-carrying capacity demonstrates EOG is an ultrastable and effective additive for specific lubricants.

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“…Ball milling has been in use for mixing and particle size reduction for a long time. Scientists have used this particle size reduction approach to exfoliate graphene sheets from graphite, sometimes using magnetic assistance [65] and sometimes using chemical [66,67] or solvent assistance [68]. Magnetic assistance provides filtration of metallic particles present in the precursors, while chemical assistance prevents the sheets from re-stacking using chemical interactions, such as π-π [66].…”

Section: Ball Millingmentioning

confidence: 99%

Graphene synthesis: a Review

Shams

Zhang

Zhu

2015

Materials Science-Poland

137

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Graphene has achieved a great amount of popularity and interest from the science world because of its extraordinary physical, mechanical and thermal properties. Graphene is an allotrope of carbon, having one-atom-thick planar sheets of sp 2 bonded carbon atoms densely packed in a honeycomb crystal lattice. Many methods to synthesize graphene have been developed over a short period and we believe it is necessary to create a list of the most notable approaches. This article focuses on the methods to synthesize graphene in an attempt to summarize and document advancements in the synthesis of graphene research and future prospects.

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Few Layer Graphene Derived from Wet Ball Milling of Expanded Graphite and Few Layer Graphene Based Polymer Composite

Cited by 24 publications

References 47 publications

Graphene boosts thermoelectric performance of a Zintl phase compound

Graphene boosts thermoelectric performance of a Zintl phase compound

Edge Oleylaminated Graphene as Ultra-Stable Lubricant Additive for Friction and Wear Reduction

Graphene synthesis: a Review

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