نتایج جستجو برای: graphene sheets

تعداد نتایج: 73442  

Herein, graphene oxide is produced by electrochemical oxidation method from graphite rod to examine its hydrogen peroxide sensing ability. The electrochemically produced graphene oxide is characterized by SEM and XRD. A few layers of Graphene Oxide(GO) sheets and corrugations in graphene sheets appeared intensely crumpled and folded into a typical wrinkled structure after electrochemical oxidat...

Journal: :Nanotechnology 2014
Bohayra Mortazavi Gianaurelio Cuniberti

We performed molecular dynamics (MD) simulations to investigate the mechanical properties of polycrystalline graphene. By constructing molecular models of ultra-fine-grained graphene structures, we studied the effect of different grain sizes of 1-10 nm on the mechanical response of graphene. We found that the elastic modulus and tensile strength of polycrystalline graphene decrease with decreas...

Journal: :Nanoscale 2014
Bohayra Mortazavi Markus Pötschke Gianaurelio Cuniberti

We developed a multiscale approach to explore the effective thermal conductivity of polycrystalline graphene sheets. By performing equilibrium molecular dynamics (EMD) simulations, the grain size effect on the thermal conductivity of ultra-fine grained polycrystalline graphene sheets is investigated. Our results reveal that the ultra-fine grained graphene structures have thermal conductivity on...

Journal: :Chemical communications 2009
Huafeng Yang Changsheng Shan Fenghua Li Dongxue Han Qixian Zhang Li Niu

A facile method to obtain polydisperse chemically-converted graphene sheets that are covalently functionalized with ionic liquid was reported -- the resulting graphene sheets, without any assistance from polymeric or surfactant stabilizers, can be stably dispersed in water, DMF, and DMSO.

2010
Laura J. Cote Jaemyung Kim Zhen Zhang Cheng Sun Jiaxing Huang

PAPER Laura J. Cote et al. Tunable assembly of graphene oxide surfactant sheets: wrinkles, overlaps and impacts on thin fi lm properties Wrinkles and overlaps: on the structure-property relationship of tiled graphene oxide monolayers. False coloured AFM images of tiled graphene oxide monolayers showing much higher surface roughness of wrinkles (front) than overlaps (back), resulting in greater ...

2014
Jussi Kauppila TURUN YLIOPISTON

8 Abstract Graphene is a material with extraordinary properties. Its mechanical and electrical properties are unparalleled but the difficulties in its production are hindering its breakthrough in on applications. Graphene is a two-dimensional material made entirely of carbon atoms and it is only a single atom thick. In this work, properties of graphene and graphene based materials are described...

Journal: :Chemical communications 2012
Surajit Some Youngmin Kim EunHee Hwang HeeJoun Yoo Hyoyoung Lee

For the first time, stable aqueous dispersions of graphene sheets can be prepared via exfoliation/in situ reduction of graphene oxide in the presence of binol salt, a stabilizing surfactant that can be completely removed without affecting the properties of graphene sheets.

Journal: :Chemical communications 2012
Fabienne Barroso-Bujans Virginie M Boucher Jose A Pomposo Lorea Buruaga Angel Alegría Juan Colmenero

Excellent dispersion of functionalized graphene (FG) sheets in polystyrene was achieved relying on the reaction of "living" poly(glycidyl phenyl ether) chains onto graphene sheets. The physical aging of polystyrene was substantially accelerated by the presence of FG sheets at low filler content, retaining film transparency and increasing the electrical conductivity.

Journal: :Journal of the American Chemical Society 2009
Hailiang Wang Joshua Tucker Robinson Xiaolin Li Hongjie Dai

We have developed a solvothermal reduction method that affords more effective reduction of chemically derived graphene sheets and graphite oxide than low-temperature reduction methods. Solvothermal reduction removed oxygen and defects from graphene sheets, increased the size of sp(2) domains, and produced materials that were as conducting as pristine graphene and exhibited clear intrinsic Dirac...

Journal: :Nano letters 2011
Ashwin Ramasubramaniam Doron Naveh Elias Towe

We investigate band gap tuning of bilayer graphene between hexagonal boron nitride sheets, by external electric fields. Using density functional theory, we show that the gap is continuously tunable from 0 to 0.2 eV and is robust to stacking disorder. Moreover, boron nitride sheets do not alter the fundamental response from that of free-standing bilayer graphene, apart from additional screening....

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