As the thinnest material known in the world, graphene has good thermal and electrical conductivity. However, the appearance of graphene has been controversial. On the one hand, it shows that the flexible graphene heat-dissipating film developed and produced by it can help the existing notebook computers, smart phones, LED displays and the like to greatly improve the heat dissipation performance. On the other hand, this new darling, known as the future of semiconductor materials, may destroy the function of living cells. If the results of the toxicity study at Brown University are further confirmed by various studies, graphene may eventually be classified as harmful substances in the same way as carbon nanotubes. What is the details?
Graphene is the thinnest material known in the world. It was first isolated from graphite in 2004. It is almost completely transparent and has good thermal and electrical conductivity. According to the analysis, the "marriage" between graphene and silicon-based technology forms a trillion output value. As a highly technical carbon material, graphene will bring a material revolution in the fields of semiconductor, photovoltaic, lithium battery, aerospace, military, LED , touch screen and so on.
New approach to "junction" graphene with silicon-based technology
Graphene is a two-dimensional crystal which is separated from graphite material and composed of carbon atoms. It has only one layer of carbon atoms and is the thinnest and hardest material to date. Its conductivity and thermal conductivity are superior, far exceeding silicon and Other traditional semiconductor materials. Scientists believe that graphene is expected to revolutionize the field of materials science, and in the future can replace silicon as an electronic component material, widely used in supercomputers, flexible touch screens, environmental and medical equipment, photonic sensors and organic solar cells.
But the main obstacle facing graphene's road to conquering Silicon Valley is the successful integration of graphene into mature metal-silicide technology. Now, researchers from the University of Vienna, Germany and Russia have succeeded in constructing a novel and high-quality metal silicide structure under the protection and coverage of a layer of graphene.
In order to reveal the basic properties of this new structure, the scientists used an angular resolution photoelectron spectrometer based on the photoelectric effect discovered by Einstein. When a light particle interacts with a material, it can transfer all of the energy to an electron in the material. If the energy of the light particles is large enough, the electrons acquire enough energy to escape from the material. ARPES enables scientists to extract information about the electronic properties of such materials by determining the angle at which electrons escape the material.
The collaborators of the study, Alexander Grures and Nickre Wabitissky of the Center for Electronic Properties of the Institute of Materials Science at the University of Vienna, Austria, said: "The graphene layer of monoatomic thickness and the blend made of it Materials allow us to borrow ARPES to study many novel electronic phenomena."
Using ARPES, scientists have found that this graphene-covered silicide is not oxidized, so it can be used in many electronic materials and equipment. Most importantly, the graphene layer reacts almost differently from the silicide it covers, which allows its properties to be preserved. Such graphene-silicides are expected to be widely used in semiconductors, spintronics, photovoltaics, and thermoelectric devices.
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