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Graphene -- a strange new material

wallpapers News 2021-05-14

The research and application of graphene have attracted more and more attention. Recently, Li Guochen, a researcher from the Institute of Mechanics, sent an email from abroad and recommended materials. He suggested that "Mechanics Garden" make a further introduction to graphene. To this end, we have compiled a brief review. Interested readers may refer to "Progress in Preparation and Application of Graphene: A Review of the 2010 Nobel Prize in Physics" in Science and Technology Review (24) 2010.
Graphene -- a strange new material
Geim and Novoselov, who won the Nobel Prize in physics in 2010, came up with a strange new material -- graphene -- in 2004 from their Friday Evening Experiments. The "Friday Night Experiment" is an interesting tradition at Heim Laboratories that encourages unimaginative thinking. The only rule: no sophisticated laboratory equipment, only bare hands, or the simplest of tools. They use a piece of transparent tape, stick on a bit of graphite, and then stick on another piece of tape, a tear, the original carbon atom layer on the tape will be peeled off to reduce. Peel and peel until you're down to the thickness of a single carbon atom, which is what this year's Nobel Prize for Physics recognizes as graphene: a single thick layer of carbon atoms arranged in a hexagonal honeycomb.
Graphene's monolayer, honeycombed two-dimensional network structure (see Figure 1) is the building block of other carbon isomers: it can be folded into fullerenes (zero dimensions), rolled into carbon nanotubes (one dimension), and stacked into graphite (three dimensions). Until Geim and Novoselov succeeded in making graphene, the material was just a theoretical hypothesis. Because according to the theory of thermodynamic fluctuations, unless there is a supporting material, it is impossible for any isolated two-dimensional crystal to exist at a finite temperature. Their discovery set off another upsurge of research on carbon materials after fullerenes and carbon nanotubes.
 
Don't think graphene is easy to peel off. Novoselov said it took him a full year to peel graphene with duct tape to remove a single layer of carbon atoms. And proving it to be a single layer of material is not easy. Because graphene is so thin (only 0.335 nanometers thick), it's hard to see it on glass. The lab of two Nobel laureates has found a way to place graphene on silicon oxide 285 nanometres thick, and use the interference effect of light waves to see it clearly through an optical microscope.

 


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