I know that graphene has two forms, zigzag and armchair. My question is, are these definitions applicable to graphene? Or they just applicable to graphene nanoribbons?
I think that graphene is infinite sheet and this definition should be for nanoribbons only. If so, how do we define a nanoribbon as an armchair or zigzag? I noticed two nanoribbons and I found that two sides of zigzag graphene nanoribbons have armchair figures and vice versa!
Graphene is a hexagonal sheet with two atoms in its unit cell. So during the graphene formation process you can have an armchair or zigzag pattern, but that difference comes only when you choose to make graphene width at the size of
Graphene has only one form, armchair and zigzag do not refer to different forms but to different directions.
You can define the orientation of a nanoribbon by the direction of its longest dimension.
Graphene is a hexagonal sheet with two atoms in its unit cell. So during the graphene formation process you can have an armchair or zigzag pattern, but that difference comes only when you choose to make graphene width at the size of
I think you are confused between Graphene and Carbon Nanotube (CNT). For graphene, there is no difference between zigzag and armchair. Effect of zigzag and armchair structures can be seen only at the edge of the graphene.
Tnx all. Your answers were clear and easy to understand. I appreciate it
Dear Somayeh,
As colleagues mentioned, graphene has only one form; at the edge of the graphene, zigzag and armchair structures can be seen only. If you click the website below, you can find a book chapter about the graphene and formation of the nanotubes. I think it provides sufficient knowledge about their structural and vibroelectronic properties.
http://www.intechopen.com/books/electronic-properties-of-carbon-nanotubes/geometric-and-spectroscopic-properties-of-carbon-nanotubes-and-boron-nitride-nanotubes
Armchair and ZigZag, as everyone mentions above, are refered to the boundaries or borders of a certain Graphene geometrical structure. The interesting feature is that the electronic behavior in the bulk (is this case is everything but the border) is modified by the differents types of boundaries. All this is well documented in the famous review of Castro-Neto and also I recomend a very solid book called Graphene by Katsnelson.
This link might help you
https://www.tfkp.physik.uni-erlangen.de/download/theses/master_daniel-branski.pdf
Spectrum of GNR depends upon nature of their edges:zigzag or armchair,as i am able to understand it means that when GNR as channel will interact with two semi-infinite electrodes left and right sides,where we can define self energies.
regards
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