Green Approach To Prepare Graphene-Based Composites with High Microwave Absorption Capacity

Chemically reduced graphene (CR-G)/poly(ethylene oxide) (PEO) composites are prepared by a simple aqueous mixing method. Graphite oxide (GO) is prepared by a modified Hummers method and further dispersed in water to form graphene oxide (G-O). The as prepared G-O is mixed with PEO and in situ reduced by l-ascorbic acid. CR-G monolayers are ∼1 nm in thickness and ∼1.5 μm in both length and width as confirmed by AFM, indicating their large aspect ratio of about 1500. G-O is dispersed in PEO at the molecular level due to hydrogen bonding, and PEO acts as a barrier for CR-G layers to prevent agglomeration during the process of reduction. CR-G/PEO composites have high permittivity, resulting from the uniform dispersion of electrically conductive CR-G with high aspect ratio. CR-G/PEO composite (2.6 vol %) shows high microwave absorbing capacity as its minimum reflection loss is −38.8 dB. CR-G sheets form a huge number of electrical pathways which can dissipate microwave energy into heat effectively as well as di...

[1]  J. Tascón,et al.  Vitamin C Is an Ideal Substitute for Hydrazine in the Reduction of Graphene Oxide Suspensions , 2010 .

[2]  Xu Du,et al.  Approaching ballistic transport in suspended graphene. , 2008, Nature nanotechnology.

[3]  M. Cao,et al.  Microwave responses and general model of nanotetraneedle ZnO: Integration of interface scattering, microcurrent, dielectric relaxation, and microantenna , 2010 .

[4]  Jiali Zhang,et al.  Reduction of graphene oxide via L-ascorbic acid. , 2010, Chemical communications.

[5]  Craig A. Grimes,et al.  The 500 MHz to 5.50 GHz complex permittivity spectra of single-wall carbon nanotube-loaded polymer composites , 2000 .

[6]  Yan Wang,et al.  Molecular‐Level Dispersion of Graphene into Poly(vinyl alcohol) and Effective Reinforcement of their Nanocomposites , 2009 .

[7]  H. Dai,et al.  Highly conducting graphene sheets and Langmuir-Blodgett films. , 2008, Nature nanotechnology.

[8]  Zeng-min Shen,et al.  Electromagnetic and microwave absorbing properties of multi-walled carbon nanotubes filled with Ag nanowires , 2008 .

[9]  C. N. Lau,et al.  Superior thermal conductivity of single-layer graphene. , 2008, Nano letters.

[10]  S. Stankovich,et al.  Graphene-based composite materials , 2006, Nature.

[11]  G. Wallace,et al.  Processable aqueous dispersions of graphene nanosheets. , 2008, Nature nanotechnology.

[12]  Yan Wang,et al.  Electromagnetic interference shielding of graphene/epoxy composites , 2009 .

[13]  A. Raghu,et al.  Preparation and Characterization of Poly(ethylene oxide)/Graphene Nanocomposites from an Aqueous Medium , 2010 .

[14]  Davide Micheli,et al.  X-Band microwave characterization of carbon-based nanocomposite material, absorption capability comparison and RAS design simulation , 2010 .

[15]  G. Wallace,et al.  Mechanically Strong, Electrically Conductive, and Biocompatible Graphene Paper , 2008 .

[16]  S. Stankovich,et al.  Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide , 2007 .

[17]  Xiaoming Yang,et al.  Well-dispersed chitosan/graphene oxide nanocomposites. , 2010, ACS applied materials & interfaces.

[18]  C. Legrand,et al.  Noniterative stable transmission/reflection method for low-loss material complex permittivity determination , 1997 .

[19]  Yongsheng Chen,et al.  Reflection and absorption contributions to the electromagnetic interference shielding of single-walled carbon nanotube/polyurethane composites , 2007 .

[20]  Qing Chen,et al.  Microwave Absorption Enhancement and Complex Permittivity and Permeability of Fe Encapsulated within Carbon Nanotubes , 2004 .

[21]  J. Kysar,et al.  Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene , 2008, Science.

[22]  Yang Yang,et al.  High-throughput solution processing of large-scale graphene. , 2009, Nature nanotechnology.

[23]  J. Elder,et al.  Ocular effects of radiofrequency energy , 2003, Bioelectromagnetics.

[24]  Roland G. S. Goh,et al.  Band‐like Transport in Surface‐Functionalized Highly Solution‐Processable Graphene Nanosheets , 2008 .

[25]  S. Stankovich,et al.  Stable aqueous dispersions of graphitic nanoplatelets via the reduction of exfoliated graphite oxide in the presence of poly(sodium 4-styrenesulfonate) , 2006 .

[26]  James M Tour,et al.  Diazonium functionalization of surfactant-wrapped chemically converted graphene sheets. , 2008, Journal of the American Chemical Society.

[27]  W. S. Hummers,et al.  Preparation of Graphitic Oxide , 1958 .

[28]  R. Tripathi,et al.  Cataracts induced by microwave and ionizing radiation. , 1988, Survey of ophthalmology.

[29]  Y. J. Chen,et al.  Microwave absorption properties of the ZnO nanowire-polyester composites , 2004 .