Preparation of Ni-reduced graphene oxide nanocomposites by Pd-activated electroless deposition and their magnetic properties

Wang, Yan; Zhao, Yan; Bao, Tengfei; Li, Xiang; Su, Yuqin; Duan, Yuping

doi:10.1016/j.apsusc.2012.05.058

Cited by 42 publications

(22 citation statements)

References 35 publications

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“…Modified Hummers' method was used to produce graphite oxide from natural graphite powder which was oxidized by potassium nitrate and potassium permanganate, in the presence of sulfuric acid . The previous work in our group indicated that a complete oxidation can be gained by slightly raising reaction temperature and extending reaction time on a controllable condition . The gained graphite oxide was exfoliated to GO via sonication in water.…”

Section: Methodsmentioning

confidence: 99%

Mechanical and electromagnetic interference shielding properties of carbon fiber/graphene nanosheets/epoxy composite

Zhao

Sun

et al. 2015

Polym. Compos.

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Graphene oxide (GO) was introduced into carbon fiber/ epoxy composite using a wet process for impregnating carbon fiber by epoxy added with GO, which resulted in an enhancement in the interfacial performance and electromagnetic interference shielding effectiveness (SE) of composite. To investigate the reinforcing mechanism, we compared the reinforcing effect between graphene oxide and reduced graphene oxide through interlaminar shear strength test, microdrop test, scanning electron microscopy, and transmission electron microscopy. The results indicate that toughening effect plays the key role for the interfacial improvement of carbon fiber/graphene nanosheets/epoxy composite. By adding only 0.1 wt% GO, the composite achieved an 11% enhancement of interlaminar shear strength at the maximum of 117.45 MPa and a SE improvement about 10 dB in the range of 5-20 GHz in the meantime, giving rise to a highly practicable potential for industrial utilization.

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Section: Methodsmentioning

confidence: 99%

Mechanical and electromagnetic interference shielding properties of carbon fiber/graphene nanosheets/epoxy composite

Zhao

Sun

et al. 2015

Polym. Compos.

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“…The saturation magnetization of 40.8 emu/g is high, considering that the ratio of FeCoNi to graphene is only 1 : 1 and heat treatment or high-temperature reduction processes were not applied. Compared with the saturation magnetization of previously reported magnetic@graphene hybrids (Ni@RGO (11.05 emu/g) [24] and FeNi@RGO (2 : 1, 21.1 emu/g) [30]) prepared via electroless plating, that of Consequently, to synthesize FeCoNi@graphene hybrids with a high saturation magnetization via electroless plating, the SnCl 2 solution concentration during sensitization should be low but not zero to reduce the excess residual SnO 2 and properly grow the Pd nanoparticles. The results indicate that the properties of other metal-graphene hybrid materials prepared via electroless plating can also be controlled.…”

Section: Resultsmentioning

confidence: 95%

“…For example, nanoparticles of noble metals such as Pt, Pd, Au, and Ag have been grown on graphene via electroless plating [14,16,18,[21][22][23]. Recently, magnetic particles including nickel [24] and nickel cobalt nanoparticles [21] were grown on graphene by electroless plating. Therefore, electroless plating can be used to prepare magnetic metal@graphene hybrids without heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pretreatment on Magnetic Nanoparticle Growth on Graphene Surface and Magnetic Performance in Electroless Plating

Lee

Kim

Lee

et al. 2019

Journal of Nanomaterials

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Electroless plating involves sensitization, activation, and plating processes. Sensitization and activation are conducted by dipping the substrate in SnCl2 solution and PdCl2 solution, respectively. These pretreatment processes are required to plate the substrate with noncatalytic surfaces. We investigated the effect of sensitization on the magnetic properties of FeCoNi@graphene hybrids prepared via electroless plating. The solution concentrations during sensitization were varied to observe changes in the structural, morphological, and magnetic properties of FeCoNi@graphene using XRD, TEM, and VSM, respectively. Sensitization under high concentration produced a large amount of SnO2, resulting in low saturation magnetization. Further, the FeCoNi@graphene hybrid prepared via electroless plating without sensitization also exhibited low saturation magnetization owing to the formation of oxides and hydroxides. We prepared FeCoNi@graphene with a saturation magnetization of 40.8 emu/g under sensitization at low concentration; this is the highest saturation magnetization among the reported magnetic material@graphene hybrids prepared via electroless plating. This study provides guidelines for the pretreatment of graphene via electroless plating and should contribute to future studies on the synthesis of magnetic material@graphene hybrids.

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“…As stated in the previous publications, the production of graphite oxide from natural graphite powder was achieved by Modified Hummers' method. The exfoliation of graphite oxide to GO was carried out by ultrasonication in solution.…”

Section: Preparation Of Epoxy Compositementioning

confidence: 99%

Combined effect of graphene oxide and MWCNTs on microwave absorbing performance of epoxy composites

Arooj

Zhao

Han

et al. 2015

Polymers for Advanced Techs

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Currently, carbon nanotube (CNT) -based composites have been considered as microwave absorbers because of the fascinating properties of CNTs. In this work, multi-walled CNTs (MWCNTs) and graphene oxide (GO) -based epoxy composites (i.e. MWCNT/EPr and GO-MWCNT/EPr), with sample thickness of 2 mm, were prepared to study microwave absorbing properties in the frequency band of 8-18 GHz. Uniform dispersion of MWCNTs in the organic solvent and polymer matrix was achieved by preparation of GO. The test for electromagnetic parameters, i.e. complex permittivity and the permeability of the samples, was carried out with vector network analyzer (VNA) using reflectiontransmission waveguides. Results showed that GO-MWCNT/EPr composites have better absorption capability than MWCNT/EPr composites. The improved reflection loss for the composites with 0.4 wt% and 0.6 wt% of GO (out of total filler loading 6 wt%) were À14.32 dB and À14.29 dB, respectively. The improvement in reflection loss and absorption bandwidth for GO-MWCNTs composites suggested that MA features are synergistically effected by GO and MWCNTs. Further skin depth and shielding effectiveness terms are studied to observe overall mechanism of electromagnetic (EM) shielding which showed that multiple reflections also play a role in EM shielding.

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Preparation of Ni-reduced graphene oxide nanocomposites by Pd-activated electroless deposition and their magnetic properties

Cited by 42 publications

References 35 publications

Mechanical and electromagnetic interference shielding properties of carbon fiber/graphene nanosheets/epoxy composite

Mechanical and electromagnetic interference shielding properties of carbon fiber/graphene nanosheets/epoxy composite

Effect of Pretreatment on Magnetic Nanoparticle Growth on Graphene Surface and Magnetic Performance in Electroless Plating

Combined effect of graphene oxide and MWCNTs on microwave absorbing performance of epoxy composites

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