The correlation between electrical conductivity and second-order Raman modes of laser-reduced graphene oxide

Ma, Bing; Rodriguez, Raúl D.; Ruban, Alexey; Pavlov, S. K.; Sheremet, Evgeniya

doi:10.1039/c9cp00093c

Cited by 139 publications

(92 citation statements)

References 49 publications

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“…This is achieved by chemically modifying the graphene surface with soft substances or solid inorganic materials [19]. Ma et al carried out current-sensing atomic force microscopy (CSAFM) experiments for laser-reduced graphene oxide (r-GO) [20]. One revealed that after laser reduction, the high-conductivity r-GO spots appear on the graphene oxide surface in the form of two-dimensional torus shapes of several micrometers.…”

Section: Introductionmentioning

confidence: 99%

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

et al. 2021

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The use of reduced graphene oxide (r-GO) is a promising way of fabricating organic–inorganic composites with unique electrical and magnetic properties. In our work, polystyrene/r-GO composites were synthesized, in which both the components are linked together by covalent bonds. The r-GO used differs from the graphene obtained from graphite through mechanical exfoliation using the ‘scotch tape’ by presenting many structural defects. Binding in the composite structure between the components was confirmed by infrared spectroscopy. Elemental analysis was carried out by energy dispersive X-ray analysis. Scanning electron microscopy, X-ray diffraction, and Raman spectroscopy were used to monitor the 2D-order in exfoliated r-GO galleries. Using a vibrating-sample magnetometer, we have shown that the composite magnetization loops demonstrate type-II superconductivity up to room temperature due to r-GO flakes. We believe that a strain field in the r-GO flakes covalently binding to a polymeric matrix is responsible for the superconductivity phenomena.

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Section: Introductionmentioning

confidence: 99%

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

et al. 2021

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“…missing carbons, extra carbons, or carbon substitutions in the structure) [49]. The I D /I G intensity ratio increases with disorder and correlates with reduced charge carrier mobility [50]; the I D /I G ratio of the thin film in this work was equal to~0.4, typical for ultrasonic exfoliation synthesis [46,51,52]. This I D /I G intensity ratio is also inversely proportional to crystallite size, calculated to be 11 nm in this work [53].…”

Section: Resultsmentioning

confidence: 99%

A graphene film interlayer for enhanced electrical conductivity in a carbon-fibre/PEEK composite

Leow

Kreider

Notthoff

et al. 2021

Functional Composite Mater

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Carbon-fibre reinforced composites are seeing increased deployment, especially in the aerospace industry, and the next-generation of these materials will need to meet demanding performance requirements beyond just specific strength. The incorporation of nanomaterials such as graphene into composites has great potential for enhancing electrical, thermal, and mechanical properties, which could then enable new capabilities such as built-in lightning strike protection and electromagnetic shielding. One major challenge is successful integration of nanomaterials into the composite during the manufacturing process especially for thermoplastic based composites. This work explores the spray deposition of exfoliated graphene in liquid suspensions for the nano-enhancement of electrical properties in carbon-fibre reinforced polyether ether keytone (PEEK) composites. Developed thin films were smooth with RMS roughness of 1.06 μm on Si substrates and RMS roughness of 1.27 μm on CF-PEEK tapes. The addition of 1.3 wt% graphene into the interlayers of CF-PEEK composites resulted in bulk electrical conductivity enhancement both in plane and through thickness of ~ 1100% and 67.5% respectively. This approach allows for pre-consolidation introduction of high-performance nanomaterials directly to thermoplastic prepregs which could open simple pathways for the in-situ manufacturing of carbon-fibre reinforced polymer nanocomposites.

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“…By plotting the second-order Raman modes area vs. laser power we could obtain an idea of the optimal irradiation conditions that maximize conductivity. 52 By using those same samples in chemical sensors one could then correlate the electrical conductivity, chemical sensitivity, and crystallinity to determine the best conditions that maximize sensor performance.…”

Section: Applications Of Laser-irradiated Mod-g: a Gas Sensor And A Fmentioning

confidence: 99%

Beyond graphene oxide: laser engineering functionalized graphene for flexible electronics

et al. 2020

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The correlation between electrical conductivity and second-order Raman modes of laser-reduced graphene oxide

Abstract: Second-order Raman modes correlate with the electrical properties of reduced graphene oxide measured at the nanoscale by atomic force microscopy.

Cited by 139 publications

References 49 publications

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

The Magnetization of a Composite Based on Reduced Graphene Oxide and Polystyrene

A graphene film interlayer for enhanced electrical conductivity in a carbon-fibre/PEEK composite

Beyond graphene oxide: laser engineering functionalized graphene for flexible electronics

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