Journal ArticleDOI
Fabrication of two-dimensional hybrid sheets by decorating insulating PANI on reduced graphene oxide for polymer nanocomposites with low dielectric loss and high dielectric constant
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In this paper, a novel polyaniline decorated reduced graphene oxide (rPANI@rGO) two-dimensional (2D) hybrid sheets were successfully prepared by in situ polymerization of aniline on graphene oxide(GO) sheets and successive reduction by hydrazine.Abstract:
Novel polyaniline decorated reduced graphene oxide (rPANI@rGO) two-dimensional (2D) hybrids sheets were successfully prepared by in situ polymerization of aniline on graphene oxide (GO) sheets and successive reduction by hydrazine. PANI is heavily reduced, thus it is electrically insulating. The hybrid sheets were used as a novel filler for high performance poly(methyl methacrylate) (PMMA) nanocomposites. Our results show that, when compared with the PMMA/rGO composites, the PMMA/rPANI@rGO nanocomposites not only show a high dielectric constant but also have low dielectric loss. For example, at 1000 Hz, a dielectric constant of 40 and a dielectric loss of 0.12 were observed in the PMMA/rPANI@rGO nanocomposite with rGO/PMMA volume ratio of 6%, whereas the dielectric constant and dielectric loss of PMMA/rGO composite with rGO/PMMA volume ratio of 6% are about 20 and 1250, respectively. More importantly, the dielectric properties of PMMA/rPANI@rGO nanocomposites can be tuned by controlling the addition of the hybrid sheets. The improved dielectric properties in PMMA/rPANI@rGO nanocomposites should originate from the isolation effect of rPANI on the rGO in PMMA matrix, which not only improves the dispersion of rGO but also hinders the direct electrical contact between rGO. This research sets up a novel route to polymer composites with high dielectric constants and low dielectric loss, and also expands the application space of graphene-based fillers.read more
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Interface design for high energy density polymer nanocomposites
Hang Luo,Xuefan Zhou,Christopher Ellingford,Yan Zhang,Yan Zhang,Sheng Chen,Kechao Zhou,Dou Zhang,Christopher R. Bowen,Chaoying Wan +9 more
TL;DR: This review provides a detailed overview on the latest developments in the design and control of the interface in polymer based composite dielectrics for energy storage applications, along with an overview of existing challenges and practical limitations.
Journal ArticleDOI
1D/2D Carbon Nanomaterial‐Polymer Dielectric Composites with High Permittivity for Power Energy Storage Applications
TL;DR: The progress in dielectric fields by using 1D/2D carbon nanomaterials as functional fillers in polymer composites is introduced, and the methods and mechanisms for improving dielectrics properties, breakdown strength and energy storage density of their dielectic nanocomposites are examined.
Journal ArticleDOI
High-k polymer nanocomposites with 1D filler for dielectric and energy storage applications
TL;DR: In this article, the authors summarized the latest research on one-dimensional and quasi-1D fillers based high-k polymer nanocomposites with the focus on the superiority of 1D or quasi-one-dimensional highk fillers in enhancing the dielectric properties and energy storage capability of polymer composites.
Journal ArticleDOI
Room-temperature cured hydrophobic epoxy/graphene composites as corrosion inhibitor for cold-rolled steel
Kung-Chin Chang,Min-Hsiang Hsu,Hsin-I Lu,Mei-Chun Lai,Pei-Ju Liu,Chien-Hua Hsu,Wei-Fu Ji,Tsao-Li Chuang,Yen Wei,Jui-Ming Yeh,Wei-Ren Liu +10 more
TL;DR: In this paper, a nanocasting was used to develop epoxy/graphene composites (EGCs) as corrosion inhibitors with hydrophobic surfaces (HEGC), which increased the contact angle of water droplets on a sample surface to ∼82° (epoxy surface) to ∼127° (hydrophobic epoxy and EGC).
Journal ArticleDOI
Superhydrophilic Graphene-Loaded TiO2 Thin Film for Self-Cleaning Applications
Srinivasan Anandan,Tata N. Rao,Marappan Sathish,Dinesh Rangappa,Itaru Honma,Masahiro Miyauchi,Masahiro Miyauchi +6 more
TL;DR: The present study reveals the ability of graphene as a low cost cocatalyst instead of expensive noble metals (Pt, Pd), and further shows its capability for the application of self-cleaning coatings with transparency.
References
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Journal ArticleDOI
Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
Sasha Stankovich,Dmitriy A. Dikin,Richard D. Piner,Kevin A. Kohlhaas,Alfred Kleinhammes,Yuanyuan Jia,Yue Wu,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.
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Sasha Stankovich,Dmitriy A. Dikin,Geoffrey Dommett,K. Kohlhaas,Eric Zimney,Eric A. Stach,Richard D. Piner,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.
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Processable aqueous dispersions of graphene nanosheets
TL;DR: It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
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The reduction of graphene oxide
Songfeng Pei,Hui-Ming Cheng +1 more
TL;DR: In this paper, the state-of-the-art status of the reduction of GO on both techniques and mechanisms is reviewed, where the reduction process can partially restore the structure and properties of graphene.
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Single Sheet Functionalized Graphene by Oxidation and Thermal Expansion of Graphite
Michael J. McAllister,Je-Luen Li,Douglas H. Adamson,Hannes C. Schniepp,Ahmed Abdala,Jun-Jun Liu,Margarita Herrera-Alonso,David L. Milius,Roberto Car,Robert K. Prud'homme,Ilhan A. Aksay +10 more
TL;DR: In this article, a detailed analysis of the thermal expansion mechanism of graphite oxide to produce functionalized graphene sheets is provided, where it is shown that the decomposition rate of the epoxy and hydroxyl sites exceeds the diffusion rate of evolved gases, yielding pressures that exceed the van der Waals forces holding the graphene sheets together.