The study found that the properties of graphene will change with the different base materials. The magic material graphene once again surprised the scientists with its own special "transformation" function. The research team of the Massachusetts Institute of Technology found that when placing graphene sheets on different substrates, their basic properties, such as electrical conductivity and chemical interaction with other substances, will vary with the nature of the substrate material. Significant changes have taken place. Because graphene is only one atom thick, scientists often put other materials underneath to support it in practice. When the material being covered is silicon dioxide commonly used in the electronics industry, graphene can easily be "given a specific function" when it comes into contact with certain specific chemicals; but if the support material is replaced with boron nitride, the face The same chemical substance, it almost does not occur chemical reactions. "This is very counterintuitive." Said Michael Strano, a senior author of the research paper and a professor of the Department of Chemical Engineering at the Massachusetts Institute of Technology. "You can turn off and open the ability of graphene to form chemical bonds based on the base material." The researchers found that the reason why graphene changes properties is that it is too thin, and the reaction mode is strongly affected by the electric field of the atoms in the underlying material. This means that a lithography pattern substrate can be covered with a layer of graphene to make a device. A part of the lithography pattern substrate is silicon dioxide and the other part is a boron nitride coating. The chemical behavior of graphene will be based on The hidden pattern changes. The paper ’s lead author and postdoctoral fellow at the Massachusetts Institute of Technology, Wang Qinghua, said: “You can allow different molecules of a biomarker (to interact with these areas on the graphene surface) without destroying the biomolecule itself.†This is It helps to manufacture microarrays for sensors that detect trace amounts of biological or chemical substances, because most current techniques for manufacturing such patterned surfaces involve high temperatures and the use of reactive solvents, which can destroy these sensitive biomolecules. Strano said that graphene can eventually become a protective coating for many materials. For example, when it is bonded to copper, it can completely eliminate the metal oxidation of copper and protect it from corrosion. Strano said that many chemists are puzzled by the seemingly unpredictable reaction of graphene under different conditions. They proposed this new electron transfer theory, which explains the behavior of graphene as being affected by the base material. This new understanding can also be used to predict the properties of graphene on other substrate materials. Wang Qinghua also believes that other research teams can get inspiration from it and explore more substrate materials to try to optimize the performance of graphene. James Tur, a professor of chemistry and computer science at Rice University, said: "This is the first systematic study on the effect of substrate materials on the chemical reactivity of graphene. It has been very carefully conducted and the conclusions are very convincing.
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