What is Graphene?
So, what is it exactly?
Graphene is a crystalline allotrope of carbon with 2-dimensional properties. Graphene is very thin and nearly transparent and is a single layer of graphite. It is remarkably strong at 200 times stronger than steel and conducts heat and electricity with great efficiency. Graphene is one million times thinner than a single human hair; so thin that it is actually considered two dimensional. Graphene is carbon atoms densely packed in a regular chicken wire (hexagonal) pattern. Columbia University stated it is “so strong it would take an elephant, balanced on a pencil, to break through a sheet of graphene the thickness of Saran Wrap”.
Graphene was identified in 2004 by Andre Geim and Konstantin Novoselov at Manchester University. They used adhesive tape to remove single layers from the surface of graphite and deposit them on a silicon wafer. The isolation of graphene was a breakthrough for which Geim and Novoselov were awarded the 2010 Nobel prize for Physics. In its purest form, graphene possesses an unsurpassed combination of electrical, mechanical and thermal properties, which gives it the potential to replace existing materials in a wide range of applications and, in the long term, to enable new applications.
Graphene is great conductor; electrons are able to flow through graphene more easily than through copper. The electrons travel through the graphene sheet as if they carry no mass and as fast as one hundredth that of the speed of light.
Graphene is 7x harder than diamond and about 200 times harder than steel. To put this into context, it will take the weight of an elephant balanced on a needle-point in order to break this one atom thick fabric! The tensile strength of graphene exceeds 1 TPa. Even though graphene is so strong, it is also very stretchable. You can stretch graphene up to 20% of its initial length.
Graphene is an excellent thermal conductor. Graphene’s thermal conductivity measured much higher than the value observed in all the other carbon structures as carbon nanotubes, graphite and diamond (> 5000 W/m/K). Graphite, the 3 D version of graphene, shows a thermal conductivity about 5 times smaller (1000 Wm-1K-1). The phenomenon is governed by the presence of elastic waves propagating in the graphene lattice, called phonons. The study of thermal conductivity in graphene may have important implications in graphene-based electronic devices. As devices continue to shrink and circuit density increases, high thermal conductivity, which is essential for dissipating heat efficiently to keep electronics cool, plays an increasingly larger role in device reliability.
Graphene, despite being the thinnest material ever made, is still visible to the naked eye. Due to its unique electronic properties, it absorbs a high 2.3% of light that passes through it, which is enough that you can see it in air (if you could manage to hold it up!). To help enhance the visibility of graphene flakes we deposit them on to silicon wafers which have a thin surface layer of silicon dioxide. Light shining on to these three-layer structures will be partially transmitted and partially reflected at each interface.
Source: The Universityof Manchester
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