Hydrothermal Dehydration for the “Green” Reduction of Exfoliated Graphene Oxide to Graphene and Demonstration of Tunable Optical Limiting Properties

Zhou, Yong; Bao, Qiaoliang; Tang, Lena Ai Ling; Zhong, Yu Lin; Loh, Kian Ping

doi:10.1021/cm9006603

Cited by 1,470 publications

(826 citation statements)

References 51 publications

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“…The Raman spectrum from graphite showed the characteristic dominant presented in the literature [45] , thereby confirming that our synthesis method results in the formation of CCG.…”

Section: Dispersion Stabilitysupporting

confidence: 88%

“…Raman spectroscopy is a widely used method for the characterisation (and identification) of carbon materials such as graphite and its conversion via exfoliation to GO and reduction to graphene [43,44,45,46] . The Raman spectrum from graphite showed the characteristic dominant presented in the literature [45] , thereby confirming that our synthesis method results in the formation of CCG.…”

Section: Dispersion Stabilitymentioning

confidence: 99%

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Preparation and characterisation of graphene composite hydrogels

2013

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Stable dispersions containing graphene and gellan gum are used to form composite films. Incorporation of graphene into the gellan gum matrix results in mechanical reinforcement and electrical conductivity at low and high graphene loading fractions, respectively. Graphene-containing gellan gum hydrogel films are prepared by immersion of composite films in Ca2+ cross-linking solutions. The resulting hydrogels are electrically conducting and exhibit reinforcement compared to the corresponding gellan gum hydrogels. 2013 Elsevier B.V. Keywords: graphene; gellan gum; hydrogels; films; conductivity; composites; mechanical AbstractStable dispersions containing graphene and gellan gum are used to form composite films.Incorporation of graphene into the gellan gum matrix results in mechanical reinforcement and electrical conductivity at low and high graphene loading fractions, respectively. Graphenecontaining gellan gum hydrogel films are prepared by immersion of composite films in Ca 2+ cross-linking solutions. The resulting hydrogels are electrically conducting and exhibit reinforcement compared to the corresponding gellan gum hydrogels.

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“…The Raman spectrum from graphite showed the characteristic dominant presented in the literature [45] , thereby confirming that our synthesis method results in the formation of CCG.…”

Section: Dispersion Stabilitysupporting

confidence: 88%

Section: Dispersion Stabilitymentioning

confidence: 99%

Preparation and characterisation of graphene composite hydrogels

2013

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“…2) indicate the existence of ether C-O (B286.7 eV) and ester C( ¼ O)O (B288.6 eV) bonds, in addition to the dominant C ¼ C bonds (B284.5 eV 20 ). Under present solvothermal synthesis conditions, reactions are expected 14,21 between/among the OH, COOH and epoxy bond functional groups of adjacent graphene sheets to generate aromatic ether and ester bonds between the sheets mainly at the edges 13,16,17 . The existence of a significant amount of C-O carbon (B3.7 at%), C ¼ O carbon (B1.6 at%) and C( ¼ O)O ester carbonyl carbon (B1.7 at%) is consistent with the observed corresponding peak for the C-O bonds in infrared spectra ( Supplementary Fig.…”

Section: Synthesismentioning

confidence: 98%

“…The condensation/cross-linking of the functional groups during synthesis, such as OH, COOH and epoxy groups that are mainly located on GO sheets edges, is expected to covalently interconnect the sheets, thereby forming a monolithic 3D chemically linked network 13,16,17 , though no direct evidence is available yet. The subsequent annealing step would remove most of the functional groups, partially restoring p-conjugation and increasing electrical conductivity 18,19 .…”

Section: Synthesismentioning

confidence: 99%

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

et al. 2015

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It is a challenge to fabricate graphene bulk materials with properties arising from the nature of individual graphene sheets, and which assemble into monolithic three-dimensional structures. Here we report the scalable self-assembly of randomly oriented graphene sheets into additive-free, essentially homogenous graphene sponge materials that provide a combination of both cork-like and rubber-like properties. These graphene sponges, with densities similar to air, display Poisson's ratios in all directions that are near-zero and largely strain-independent during reversible compression to giant strains. And at the same time, they function as enthalpic rubbers, which can recover up to 98% compression in air and 90% in liquids, and operate between À 196 and 900°C. Furthermore, these sponges provide reversible liquid absorption for hundreds of cycles and then discharge it within seconds, while still providing an effective near-zero Poisson's ratio.

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“…This red shift shows the reduction of GO and arises from the restoration of a π-conjugation network of reduced GO. In addition, the disappearance of the weak absorption peak at 300 nm vouches for the elimination of oxygen groups in reduced GO [23][24][25]. Figure 3C and D (inset) shows the UV-vis spectra and Tauc plot of the MgO-GO2 and MgO-GO3 sample produced by MgO doped-GO at 180°C and 210°C, respectively.…”

Section: Linear Optical Propertiesmentioning

confidence: 95%

Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites

Kimiagar

Abrinaei

2017

Nanophotonics

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Magnesium oxide (MgO)-graphene oxide (GO) nanocomposites were prepared by the hydrothermal method at different temperatures. The effect of growth temperature on the structural, linear, and nonlinear optical (NLO) parameters was investigated. The decoration of MgO on GO sheets was confirmed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and UV-visible (UV-vis) spectroscopy analyses. The energy band-gaps of MgO-GO nanocomposites were calculated from UV-vis spectrum using Tauc plot. The NLO parameters of MgO-GO nanocomposites were calculated for the first time by the simple Z-scan technique with nanosecond Nd:YAG laser at 532 nm. The nonlinear absorption coefficient β and nonlinear refractive index n 2 for MgO-GO nanocomposites at the laser intensity of 1.1 × 10 8 W/cm 2 were measured to be in the order of 10 −7 cm/W and 10 −12 cm 2 /W, respectively. The third-order NLO susceptibility of MgO-GO nanocomposites was measured in the order of 10 −9 esu. The results showed that MgO-GO structures have negative nonlinearity as well as good nonlinear two-photon absorption at 532 nm. Furthermore, the NLO parameters increased by the enhancement of the growth temperature. As the investigation of new materials plays an important role in the advancement of optoelectronics, MgO-GO nanocomposites possess potential applications in NLO devices.

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Hydrothermal Dehydration for the “Green” Reduction of Exfoliated Graphene Oxide to Graphene and Demonstration of Tunable Optical Limiting Properties

Cited by 1,470 publications

References 51 publications

Preparation and characterisation of graphene composite hydrogels

Preparation and characterisation of graphene composite hydrogels

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites

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