Graphene Definition and 212 Threads

Cheaper ways to make graphene I want to try making my own computing parts with graphene. What are we capable of now with graphene? What parts can we make? What computations can we do? Do we have circuit board limitations?

Is the reciprocal of the work function of ' Graphene ' a usable tool for the calculation of the electrical pressure * capacity or even an indicator of co-conductivity of a given area of (magnetically oriented) Graphene in relation to a substrate material which is also conductive ?

People spend so much time drooling over the millions or even billions made by software tycoons and their sometimes very crappy software, that we may forget about the tangible accomplishments of mechanical engineers. Here is a beautiful example. Do you have more...

http://www.nextbigfuture.com/2017/01/mit-makes-compressed-graphene-sponge.html My first thought was coal exhaust scrubber technology. But there seem to so many applications.

I have looked on the internet but not found a clear anwser. can graphene sutstane its 2-dimensional form witout anny help froms substrades? tanks for helping ^^

Is it feasible to turn the abundance of carbon in the atmosphere into graphene, given it is an allotrope of carbon and would it be worth the trouble?

From what I'm hearing, graphene will change the way we live, work and play. Everything from cars and clothing to workplaces and weaponry will incorporate the stuff. Is this true, the hype of stock promoters or something in between? Which aspects of life will be the most affected by the use of...

Hi. Why Zigzag graphene nanoribbons is metallics??

Hi i saw some technics with sticky tape and pencils(i know its not pure graphite) but how can i take it a step further to produce more ?

How to insert strain on graphene using tight binding methods? How strain can be applied in one of the x or y axis?

I'm recently interested in the topological/Weyl semimetals, but I'm not an expert on the theory. Most papers just define Weyl semimetal as a material that have pairs of Weyl points with opposite Berry curvature. Here in graphene, the Berry curvature of the Dirac cones at K and K' point is also...

Can the basic techniques of wavefunction matching that one would use to calculate the transmission through a step barrier potential and the Dirac hamiltonian of graphene be used for a situation where instead the fermi velocity changes in a step like fashion. i.e. instead of a Hamiltonian like...

Young’s modulus is given as the second derivative of the total energy with respect to the strain divided by the equilibrium volume. Can help me for the calculate equilibrium volume and young's modulus?

Hi In calculation the mechanical properties of graphene nanoribbons by tight binding methods should band structure graphene calculated by the DFT and tight binding methods fitted to calculate b parameter. In the tight binding methods hopping parameter changes as follow: t'_{ppsigma}=t_{ppsigma}...

if we solve elliptic integrals related to doped graphene, band gap does not occur. But actually it occures with p doping. How can I solve this puzzle? Thanks for any help.

I am doing a lab and we get silver epoxy resin on our double layered graphene sample where we didn't want it. We can take off the silver paint using ethanol but worry it may destroy the thin layer. Will ethanol be okay to use? Are there any suggestions on what to use?

So I have heard about graphene and its properties recentlty and more specifically its ability to resist tearing. With this in mind (and a video from the YouTube channel "Film Theory") I believed it was possible to stack layers of graphene so that they can resist things like bullets. But I...

most STM images of graphite have been acquired using a bias voltage of ? Or in the range ? Same thing for graphene and Silicon carbide

Hello everyone! :) I'm sorry that I'm posting something that might be obvious, but I'm still struggling to capture all the concepts behind the fundamental physics of this model. Let's say, I have a 2D sheet of graphene, on which, there's a physisorbed layer of molecular dipoles (vdW bonding...

Can anyone explain what is tight binding method . I don't understand much .for solids mostly for graphene with one atom per site

Hi, I haven't had any chemistry exposure for over a decade, (I have some semi-conductor and quantum mechanics experience though) I was wondering: (to my vague 'knowledge') If graphite is just made of many overlapped graphene sheets, then why isn't graphite conductive? Also, if graphene is a "2D...

Dear Member, Respected Members, I am working on the behaviour of hydrogen at the Cu/Ni (111)-graphene interface. In case of Ni (111), the atomic H on the interface diffuse inside the the surface. While in case of Cu (111), the H atom stays at the Cu(111)-graphene interface. It seems that H...

I want to write a octave code(It can be another language I want to know how should I think to write a such a code ) to obtain graphene structure like in the figure. This code should give me a graphene sheet which in size I want when I enter the position of the atoms in the lattice.I think that...

Hello, What is the energy dispersion relation and density of states for graphen near the Dirac point ? I am looking for a proper graph illustrating these properties.

Hi I have plot band structure zigzag graphene nanoribbons with Matlab. I do not know if it is properly written program anyone can help Bug fixes. NU=10; % Number of atoms Nbnd=4*NU; % number of bands aa=2.26; a=sqrt(3)*aa; Csoc=0.0; X(1)=0; Y(1)=0; for ixy=2:NU if mod(ixy,4)==2...

For the calculation uniaxial strain in graphene nanoribbons, Which of the bonds sigma or pi should be considered?

Homework Statement I am running CASTEP DFT software to simulate pristine graphene, and am unsuccessful in obtaining the trademark zero band gap at the k-point as reported in numerous papers to date. Any assistance would be greatly appreciated as the subject is very new but I am keen to push...

I am currently modelling van der Waals interactions using DFT-D as my undergrad thesis. The basic set-up is a molecule suspended above a crystal surface. To start the surface is graphene, which has been causing me some trouble as neither VMD nor VESTA are allowing me to visualise the set-up...

If I were to replicate this experiment http://arxiv.org/pdf/1505.04254v1.pdf but was limited to the purchase of only one laser which frequency and what power should I choose? I know the research team that conducted this experiment purchased their lasers from jetlasers.org but they unfortunately...

I am a condensed matter grad. student, but do not work on Graphene. I am interested in learning about the fundamental physics in graphene (e.g. the need to use Dirac equation to represent the motion of electrons). I know that many books are there, but not all are geared towards fundamental...

So, according to several papers, after graphene's production via CVD, one wets the Copper-Graphene substract with DI water. I was wondering what's the point of doing that?

As far as I know, the Hamiltonian of graphene in the Bloch's sums |A\rangle and |B\rangle near the points K or K' is a 2 \times 2 matrix with the components: \langle A|H|A\rangle, \langle A|H|B\rangle, \langle B|H|A\rangle,\langle B|H|B\rangle which all are parameters (and not variables). But in...

Can help me for the write program for calculating nearest neighbours in graphene? Program the nearest neighbours for armchair graphene nanoribbon same as the follow: close all clear all clc L = 2; H = 4; lineatoms = 2 * H + 1; for i = 1:lineatoms if mod(i,2)==1 x(1,i) = .71; else...

Hello, I am interested in possibly fabricating microprocessors if I make it through school. I have yet to take my first course in organic chemistry. Will I have to know anything about organic chemistry if I am to fabricate microprocessors? Do you know if organic chemistry is employed in the...

Hello. I don't know much about the Graphene. I do know about this are 1. It is just a single layer of cabon bonding. 2. The mobility of electrons for Graphene is about 100 times faster than normal metal(right?) 3. It is very robust material better than diamond. In terms of its robustness, I...

Dear forum people The new position of the carbon atoms under uniaxial strain r in the framework of elastic theory is shown by the following equation: ri'=(I+ε).ri in which ri and ri' are the position of the carbon atoms before and after the strain is applied, respectively. I is the unit matrix...

Can someone recommend a good book on graphene?

I am encountering an issue when I plot attempting to plot 3d band structure of graphene in Mathematica. While the general shape and curvature looks fine, the cones at the K-points are not touching, which is an important qualitative electronic property of graphene. Since further down the line I...

I have constructed GNR(graphene nanoribbon Hamiltonian) which is of 18 by 18 matrix,i want to add magnetic field term how i can do that ,since earlier B was taken to be zero. Thanks

Hi I have Hamiltonian matrix and overlap matrix. How to calculate tight binding dispersion for graphene in matlab? I would be appreciated if could some one give me a hand on my problem.

http://www.bbc.com/news/technology-32101473 The BBC reports that a graphene light bulb will go on sale. What are its advantages over current technologies?

Numerically, Kronig-Penney model in graphene superlattices (SL) is drastically different from those in semiconductor SL. In semiconductors, transverse momentum k// can be isolated from the longitudinal momentum q, even if the superlattices potential is complex. In graphene, however, k_y cannot...

I want to see if anyone has worked with this or know anything about this type of material? I am looking into particular the coating process of materials I.E. steel. Looking for processes and material specs. Any help would greatly be appreciated. Thanks

I have been told when making transport measurements of graphene it is usually placed in a cryostat and cooled to ~ 4K. However I cannot find any sources that back this up and don't fully understand why it is done in the first place. My thoughts are that it is to measure the carrier mobility...

Hello all Quickly, does anyone have an explanation if any for usage of silicon oxide in graphene visibility experiment?? I have a seminar presentation in one hour and I know its a possible question from one of the supervisors. Thank you

There’re 2 ways to calculate the subband structure of graphene nanoribbon using tight-binding model, for Zigzag chain: The first one is to diagonize the Hamiltonian $H = H_0 + H_10*exp(i*k_x) + H_01*exp(-i*k_x)$ and obtains the eigenvalues. The second method is just diagonize the Hamiltonian in...

Andre Geim & Co have discovered that graphene can act as a sieve which allows protons to pass through it, while blocking other atoms and molecules: http://www.independent.co.uk/news/science/scientists-predict-green-energy-revolution-after-incredible-new-graphene-discoveries-9885425.html...

Researchers from the University of Manchester were surprised to find that positively charged hydrogen atoms - protons - can pass through it http://www.independent.co.uk/news/science/scientists-predict-green-energy-revolution-after-incredible-new-graphene-discoveries-9885425.html Does that mean...

Hi I've made what I think is graphene. I first put the solution on cardboard and then I put some on polyethylene. When they had dried, I tested conductivity with a digital multimeter with the scale set on megaohms. The cardboard was nonconducting, but the sample on poly to my astonishment showed...

From A member of the Minnesota Futurist who is still looking at/ for? any thing Graphen