نتایج جستجو برای: annular graphene sheet

تعداد نتایج: 98654  

2012
Liang Yan Christian Punckt Ilhan A. Aksay Wolfgang Mertin Gerd Bacher

Kelvin probe force microscopy was used to study the impact of contacts and topography on the local potential distribution on contacted, individual functionalized graphene sheets (FGS) deposited on a SiO2/Si substrate. Negligible contact resistance is found at the graphene/Ti interface and a graphene resistance of 2.3 kΩ is extracted for a single sheet with sub-μm size. Pronounced steps in the t...

2011
Benedikt Westenfelder

We designed a graphene based TEM sample carrier to enable atomically resolved studies of the heat-induced evolution of deposits on graphene. By in-situ application of electric current to a freestanding sheet of graphene, we obtain local temperatures exceeding 1000K. We investigated various heat induced phenomena of gold particles on an atomically clean graphene surface. Initially, the gold nano...

2015
Baoyuan Man Shicai Xu Shouzheng Jiang Aihua Liu Shoubao Gao Chao Zhang Hengwei Qiu Zhen Li

We report a kind of electric field tunable transparent and flexible capacitor with the structure of graphene-Bi1.5MgNb1.5O7 (BMN)-graphene. The graphene films with low sheet resistance were grown by chemical vapor deposition. The BMN thin films were fabricated on graphene by using laser molecular beam epitaxy technology. Compared to BMN films grown on Au, the samples on graphene substrates show...

M Fakhraie, M.A Roudbari P Roodgar Saffari

Based on the third-order shear deformation theory (TSDT), this paper numerically investigates the natural frequencies and time response of three-layered annular plate with functionally graded materials (FGMs) sheet core and piezoelectric face sheets, under initial external electric voltage. The impressive material specifications of FGM core are assumed to vary continuously across the plate thic...

2017
Hervé Le Dret Annie Raoult H. Le Dret A. Raoult

We characterize the macroscopic effective mechanical behavior of a graphene sheet modeled by a hexagonal lattice with twoand three-point atomic interactions, using Γ-convergence.

2012
Bo Qiu Yan Wang Qing Zhao Xiulin Ruan

We use molecular dynamics simulations to explore the lattice thermal transport in free-standing and supported single-wall carbon-nanotube (SWCNT) in comparison to that in graphene nanoribbon and graphene sheet. For free-standing SWCNT, the lattice thermal conductivity increases with diameter and approaches that of graphene, partly due to the curvature. Supported SWCNT thermal conductivity is re...

2007
K. Kechedzhi E. McCann V. I. Fal’ko H. Suzuura T. Ando B. L. Altshuler

We describe the weak localization correction to conductivity in ultrathin graphene films, taking into account disorder scattering and the influence of trigonal warping of the Fermi surface. A possible manifestation of the chiral nature of electrons in the localization properties is hampered by trigonal warping, resulting in a suppression of the weak anti-localization effect in monolayer graphen...

2014
Fangli Liu Y D Chong Shaffique Adam Marco Polini

Perfect absorption of radiation in a graphene sheet may play a pivotal role in the realization of technologically relevant optoelectronic devices. In particular, perfect absorption of radiation in the terahertz (THz) spectral range would tremendously boost the utility of graphene in this difficult range of photon energies, which still lacks cheap and robust devices operating at room temperature...

Journal: :The Journal of chemical physics 2013
Anh D Phan Trinh X Hoang The-Long Phan Lilia M Woods

The van der Waals interaction between a lipid membrane and a substrate covered by a graphene sheet is investigated using the Lifshitz theory. The reflection coefficients are obtained for a layered planar system submerged in water. The dielectric response properties of the involved materials are also specified and discussed. Our calculations show that a graphene covered substrate can repel the b...

A. Amrollahi A. Behzadmehr, A. M. Rashidi M. Izadi M. M. Shahmardan

This paper was aimed to address the modeling of effective thermal conductivity and viscosity of carbon structured nanofluids. Response surface methodology, D_optimal design (DOD) was employed to assess the main and interactive effects of temperature (T) and weight percentage (wt %) to model effective thermal conductivity and viscosity of multi wall and single wall carbon nanotube, CVD and RGO G...

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