Metamaterial Vibration of Tensioned Circular Few-Layer Graphene Sheets

2020 ◽  
Vol 87 (6) ◽  
Author(s):  
Lu Lu ◽  
C.Q. Ru ◽  
Xingming Guo
Keyword(s):  
Effective Mass ◽  
Vibration Isolation ◽  
Vibration Suppression ◽  
Flexural Vibration ◽  
Nanoelectromechanical Systems ◽  
Graphene Sheets ◽  
Layer Graphene ◽  
Negative Effective Mass ◽  
Elastic Membranes ◽  
Few Layer Graphene

Abstract The present work aims to examine the metamaterial vibrational behavior of circular few-layer graphene sheets under layerwise tension forces. For this objective, a simplified three-membrane model is developed to simulate flexural vibration of tensioned circular few-layer graphene sheets, in which tensioned top and bottom layers are modeled as two elastic membranes while all less-tensioned or tension-free inner layers together are treated as a single membrane, and the three membranes are coupled through the van der Waals interaction between adjacent layers. Our results show that when the two outermost layers are highly tensioned but the inner layers are free of tension, circular few-layer graphene sheets exhibit negative effective mass within a certain terahertz frequency range. Moreover, such few-layer graphene sheets with negative effective mass demonstrate remarkable vibration isolation and vibration suppression. This research broadens our perspectives for designing and analyzing graphene-based metamaterials and resonators and could find potential application in nanoelectromechanical systems.

2D porous carbon nanosheets constructed using few-layer graphene sheets by a “medium-up” strategy for ultrahigh power-output EDLCs

2018 ◽  
Vol 6 (22) ◽  
pp. 10331-10339 ◽  
Author(s):  
Panpan Chang ◽  
Kazuki Matsumura ◽  
Jizong Zhang ◽  
Jie Qi ◽  
Chengyang Wang ◽  
...  
Keyword(s):  
Double Layer ◽  
Power Output ◽  
Porous Carbon ◽  
Electric Double Layer ◽  
Graphene Sheets ◽  
Carbon Nanosheets ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Double Layer Capacitors ◽  
Electric Double Layer Capacitors

2D porous carbon nanosheets (PCNs) occupy the foreground in the field of electric double-layer capacitors (EDLCs).

scholarly journals Biocarbon Meets Carbon—Humic Acid/Graphite Electrodes Formed by Mechanochemistry

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4032
Author(s):  
Lianlian Liu ◽  
Niclas Solin ◽  
Olle Inganäs
Keyword(s):  
Humic Acid ◽  
Low Cost ◽  
Graphene Sheets ◽  
Mechanochemical Method ◽  
Graphite Electrodes ◽  
Conductive Materials ◽  
Layer Graphene ◽  
Redox Active ◽  
Few Layer Graphene ◽  
Alcoholic Hydroxyl

Humic acid (HA) is a biopolymer formed from degraded plants, making it a ubiquitous, renewable, sustainable, and low cost source of biocarbon materials. HA contains abundant functional groups, such as carboxyl-, phenolic/alcoholic hydroxyl-, ketone-, and quinone/hydroquinone (Q/QH2)-groups. The presence of Q/QH2 groups makes HA redox active and, accordingly, HA is a candidate material for energy storage. However, as HA is an electronic insulator, it is essential to combine it with conductive materials in order to enable fabrication of HA electrodes. One of the lowest cost types of conductive materials that can be considered is carbon-based conductors such as graphite. Herein, we develop a facile method allowing the biocarbon to meet carbon; HA (in the form of a sodium salt) is mixed with graphite by a solvent-free mechanochemical method involving ball milling. Few-layer graphene sheets are formed and the HA/graphite mixtures can be used to fabricate HA/graphite hybrid material electrodes. These electrodes exhibit a conductivity of up to 160 S·m−1 and a discharge capacity as large as 20 mAhg−1. Our study demonstrates a novel methodology enabling scalable fabrication of low cost and sustainable organic electrodes for application as supercapacitors.

scholarly journals Oxygen-Functionalized Few-Layer Graphene Sheets as Active Catalysts for Oxidative Dehydrogenation Reactions

ChemSusChem ◽  
2013 ◽  
Vol 6 (5) ◽  
pp. 732-732
Author(s):  
Viviane Schwartz ◽  
Wujun Fu ◽  
Yu-Tung Tsai ◽  
Harry M. Meyer ◽  
Adam J. Rondinone ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Graphene Sheets ◽  
Layer Graphene ◽  
Dehydrogenation Reactions ◽  
Few Layer Graphene

A facile and fast electrochemical route to produce functional few-layer graphene sheets for lithium battery anode application

2014 ◽  
Vol 2 (37) ◽  
pp. 15298-15302 ◽  
Author(s):  
Farid Ouhib ◽  
Abdelhafid Aqil ◽  
Jean-Michel Thomassin ◽  
Cédric Malherbe ◽  
Bernard Gilbert ◽  
...  
Keyword(s):  
Lithium Battery ◽  
Simple Approach ◽  
Graphene Sheets ◽  
Functionalized Graphene ◽  
Li Ion Battery ◽  
Layer Graphene ◽  
Li Ion ◽  
Few Layer Graphene ◽  
Battery Anode

We report a simple approach for the production of polymer functionalized graphene for Li-ion battery anodes.

scholarly journals Preparation of Colloidal Dispersions of Graphene Sheets in Organic Solvents by Using Ball Milling

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Weifeng Zhao ◽  
Furong Wu ◽  
Hang Wu ◽  
Guohua Chen
Keyword(s):  
Organic Solvents ◽  
Colloidal Suspension ◽  
Colloidal Dispersions ◽  
Graphene Sheets ◽  
Graphite Nanosheets ◽  
Force Microscopy ◽  
Layer Graphene ◽  
Atomic Force ◽  
Transmission Electron ◽  
Few Layer Graphene

A top-down method was developed for producing colloidal dispersions of graphene sheets. Graphite nanosheets comprising hundreds of carbon layers were dispersed and gently ball-milled to exfoliate into graphene in a variety of organic solvents. After 30 hours of the shear-force-dominated grinding and a subsequent 4000 r.p.m. of centrifugation, single- and few-layer graphene sheets were readily prepared and homogeneously and stably suspended in the good solvent medium which possesses a surface tension value close to 40 mJm−2, such as inN,N-dimethylformamide, at a concentration up to 0.08 mg ml−1, achieving a yield higher than 32.0 wt%. The graphene materials in the colloidal suspension were characterized using scanning and transmission electron microscopy and atomic force microscopy.

Synthesis of Carbon Nanowalls and Few-Layer Graphene Sheets on Transparent Conductive Substrates

2015 ◽  
Vol 229 (1-2) ◽  
Author(s):  
Michael Höltig ◽  
Charlotte Ruhmlieb ◽  
Christian Strelow ◽  
Tobias Kipp ◽  
Alf Mews
Keyword(s):  
Chemical Vapor ◽  
Graphene Sheets ◽  
Radio Frequency Plasma ◽  
Capacitively Coupled ◽  
Glass Substrates ◽  
Layer Graphene ◽  
Frequency Plasma ◽  
Conductive Substrates ◽  
Carbon Nanowalls ◽  
Few Layer Graphene

AbstractWe report on the growth of carbon nanowalls and few-layer graphene sheets on glass substrates coated with different transparent conductive oxides or gold. The growth is accomplished by a capacitively-coupled radio-frequency plasma-enhanced chemical vapor deposition setup with a gas mixture of C

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