The magical material graphene once again surprised scientists with its own special "transformation" function. According to a report by the Physicist Network on August 13, the MIT research team found that when graphene sheets are placed on different substrates, their basic properties, such as electrical conductivity and chemistry with other substances. The effect, etc., will vary significantly depending on the nature of the substrate material. The research was published this week in the journal Nature and Chemistry. Since graphene is only one atom thick, scientists often put other materials under it to support it. When the covered material is silica commonly used in the electronics industry, graphene can be easily "given a specific function" by contact with certain chemicals; however, if the support material is replaced with boron nitride, face The same chemical, it hardly chemical reaction. “It’s very counterintuitive,†says Michael Strano, a senior author of the research paper and professor of chemical engineering at the Massachusetts Institute of Technology. “You can turn off and turn on graphene to form chemical bonds based on the substrate material.†The researchers found that graphene changes its properties because it is too thin and the reaction is strongly affected by the electric field of the atoms in the underlying material. This means that a layer of graphene can be coated on a lithographic pattern substrate to fabricate a device. A portion of the lithographic pattern substrate is silicon dioxide and the other portion is a boron nitride coating. The chemical behavior of the graphene will be based on The hidden pattern changes. Wang Qinghua, a lead author of the paper and a postdoctoral fellow at the Massachusetts Institute of Technology, said: "You can interact with different molecules of a biomarker (with these regions of the graphene surface) without destroying the biomolecule itself." Helps manufacture microarrays for sensors that detect trace amounts of biological or chemical substances, as most of today's techniques for making such patterned surfaces involve high temperatures and the use of reactive solvents that 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 response of graphene under different conditions. They proposed this new electron transfer theory, which interprets the behavior of graphene as being subjected to substrate materials. Impact, 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 draw inspiration and explore more base materials in an effort to optimize the performance of graphene. James Tull, a professor of chemical and computer science at Rice University, said: "This is the first systematic study of the effects of substrate materials on the chemical reactivity of graphene. It is very well-considered and the results are very convincing."
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