Journal ArticleDOI
Electromagnetic Performance of RF NEMS Graphene Capacitive Switches
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TLDR
In this article, the conductivity of the membrane is accurately modeled in the up-and down-state positions of the switch by considering the field effect of graphene, and rigorous full-wave simulations are then performed to obtain the scattering parameters of a switch.Abstract:
The RF performance of a nanoelectromechanical systems (NEMS) capacitive switch based on graphene is evaluated. Our results show that graphene can be a good candidate for the membrane of RF NEMS switches in applications where low actuation voltage and fast switching are required. The conductivity of the membrane is accurately modeled in the up- and down-state positions of the switch by considering the field effect of graphene. Rigorous full-wave simulations are then performed to obtain the scattering parameters of the switch. It is shown that graphene's conductivity variation due to electric field effect has a limited yet beneficial impact on the performance of the switch. It is also demonstrated that while monolayer graphene results in quite high switch losses at high frequency, the use of multilayer graphene, can considerably reduce the switch losses and improve the RF performance. Finally, an equivalent circuit model for the graphene-based RF NEMS switch is extracted and the results are compared with the full-wave 3-D electromagnetic simulation. These results motivate further efforts in the fabrication and characterization of graphene RF NEMS.read more
Citations
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Journal ArticleDOI
Self-biased reconfigurable graphene stacks for terahertz plasmonics
Juan Sebastian Gomez-Diaz,Juan Sebastian Gomez-Diaz,Clara F. Moldovan,S. Capdevila,Jordi Romeu,Laurent Syavoch Bernard,Arnaud Magrez,Adrian M. Ionescu,Julien Perruisseau-Carrier +8 more
TL;DR: Graphene stacks composed of two or more graphene monolayers separated by electrically thin dielectrics are reported on and it is shown that adding an additional gate allows independent control of the complex conductivity of each layer within the stack and provides enhanced control on the stack equivalentcomplex conductivity.
Journal ArticleDOI
A broad dual-band switchable graphene-based terahertz metamaterial absorber
TL;DR: In this paper, a switchable graphene-based terahertz metamaterial absorber is proposed by using nonstructured graphene loaded with simple dielectric resonators, which can achieve both the broad and dual-band absorption with polarization-independent and wide-angle characteristics.
Journal ArticleDOI
Graphene Fabry–Perot Cavity Leaky-Wave Antennas: Plasmonic Versus Nonplasmonic Solutions
TL;DR: In this paper, a single unpatterned graphene sheet placed inside a grounded dielectric multilayer is studied with the aim of characterizing their performance in terms of pattern reconfigurability, directivity, and radiation efficiency.
Journal Article
A self-consistent theory for graphene transport.
TL;DR: In this paper, the authors show that most of the observed transport properties of graphene sheets at zero magnetic field can be explained by scattering from charged impurities, with weak dependence on impurity concentration.
Journal ArticleDOI
Modeling the effects of material properties on the pull‐in instability of nonlocal functionally graded nano‐actuators
TL;DR: In this paper, the authors investigated the dynamic pull-in behavior of nonlocal functionally graded nano-actuators by considering Casimir attraction and showed that two terms in series expansions are adequate to achieve the acceptable approximation for fundamental frequency as well as the analytic solution.
References
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Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
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Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene
TL;DR: Graphene is established as the strongest material ever measured, and atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
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Superior Thermal Conductivity of Single-Layer Graphene
Alexander A. Balandin,Suchismita Ghosh,Wenzhong Bao,Irene Calizo,Desalegne Teweldebrhan,Feng Miao,Chun Ning Lau +6 more
TL;DR: The extremely high value of the thermal conductivity suggests that graphene can outperform carbon nanotubes in heat conduction and establishes graphene as an excellent material for thermal management.
Journal ArticleDOI
Large-scale pattern growth of graphene films for stretchable transparent electrodes
Keun Soo Kim,Yue Zhao,Houk Jang,Sang Yoon Lee,Jong Min Kim,Kwang S. Kim,Jong Hyun Ahn,Philip Kim,Philip Kim,Jae-Young Choi,Byung Hee Hong +10 more
TL;DR: The direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers is reported, and two different methods of patterning the films and transferring them to arbitrary substrates are presented, implying that the quality of graphene grown by chemical vapours is as high as mechanically cleaved graphene.
Journal ArticleDOI
Roll-to-roll production of 30-inch graphene films for transparent electrodes
Sukang Bae,Hyeongkeun Kim,Youngbin Lee,Xiangfan Xu,Jaesung Park,Yi Zheng,Jayakumar Balakrishnan,Tian Lei,Hye Ri Kim,Young Il Song,Young Jin Kim,Kwang S. Kim,Barbaros Özyilmaz,Jong Hyun Ahn,Byung Hee Hong,Sumio Iijima,Sumio Iijima +16 more
TL;DR: The roll-to-roll production and wet-chemical doping of predominantly monolayer 30-inch graphene films grown by chemical vapour deposition onto flexible copper substrates are reported, showing high quality and sheet resistances superior to commercial transparent electrodes such as indium tin oxides.