Graphene is a two-dimensional crystal, the common people of the graphite is plane carbon atoms stacked by a layer with honeycomb ordered formed, graphite layer interaction is weak, it is easy to form each other off, graphite sheet. When the graphite sheet is stripped into a single layer, it is only a single layer of carbon atoms. The latest discovery of graphene is one of the most effective ways to prevent corrosion. Commonly used polymer coating is very easy to be scratched, reduce the protection performance; and graphene to do the protective film, significantly slow down the corrosion rate of metal, more robust anti damage. Graphene is not only used in the electronics industry star, traditional industry prospects are limitless. Its application direction: marine corrosion protection, metal corrosion, heavy anti-corrosion and other fields. Graphene has good thermal conductivity and electrical conductivity. However, graphene, which can help the existing notebook computers, smart phones, LED display and so on, graphene can help to improve the heat dissipation performance greatly.
Characteristic of graphene
Electrical conductivity
Graphene integrated circuit
The stable lattice structure of graphene makes carbon atoms have excellent electrical conductivity. The electrons in graphene will not be scattered due to the lattice defects or the introduction of exotic atoms when they move in orbit. The interatomic force is very strong, under normal temperature, even if the surrounding carbon atoms occur bump interference, electrons in graphene is very small.
mechanical properties
Graphene is known to be the highest intensity of human material, harder than diamonds, strength is higher than the world's best steel 100 times higher. The mechanical properties of graphene were studied by physicists at the Columbia University. They selected some 20 to 10 micron graphene particles. The researchers first put these graphene samples on a surface that is drilled with holes in the thin plate, the diameter of which is between 1.5 and 1 microns. Then, they put pressure on the graphene sheets placed on the holes with a diamond probe, to test their ability to withstand.
Before the graphene sample particles began to break, they can withstand the maximum pressure of nm per 100 nm actually reached about 2.9 micro cattle. According to scientists estimates, this result is equivalent to 55 Newton pressure to be applied to the 1 meter long graphene fracture. If it is made into a packaging bag, it will be able to withstand the weight of about two tons.
Saturated absorption
When the input light intensity exceeds a threshold value, this unique absorption property becomes saturated. This kind of nonlinear optical behavior is called saturable absorption, and the threshold value is called the saturation flow. To give intense visible or near infrared excitation, because the total absorption of graphene and the zero energy gap, graphene is very easy to become saturated. Graphene can be used for mode locking of fiber lasers. With the preparation of graphene as a saturable absorber can achieve full band locking. Because of the special nature of the ultrafast photonics, graphene has wide range of applications.
Spin transport
Scientists believe graphene is an ideal material for the spin electronics, because of its spin orbit effect is very small, and almost no nuclear magnetic moment of carbon element. The non local magnetoresistance effect can be used to measure the high reliability of spin injection in graphene films at room temperature, and the observed spin coherence length is more than 1 microns. Use the switch, can control the polarity of the spin current.
Interaction of electrons
Graphene electronics and electronics and honeycomb grid existed among the strong interaction. Scientists with the United States Berkeley Laurence National Laboratory's advanced light source (ALS), the electronic synchrotron. The intensity of the light generated by the accelerator is equivalent to 100 million times the intensity of the medical X - ray. Scientists use this strong light source observation found that the electrons in graphene is not only strong interaction with the honeycomb lattice, but also has a strong interaction between electrons and electrons.
