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According to a report from the Physicist Organization Network on May 22, a study by the Georgia Institute of Technology in the United States showed that hydrogen plays an important role in determining the chemical characteristics and structural composition of graphene oxide. Scientists said that understanding the characteristics of graphene oxide and how to control them are very important for the potential applications of this material in nanoelectronic devices, nanoelectromechanical systems, sensing, composite materials, optics, catalysis, and energy storage. The results of relevant research were published in the recently published "Nature·Material" magazine.
Eliza Redo, an associate professor in the school's Physics Department, said that graphene oxide materials are very interesting. It is necessary to add two oxygen-containing functional groups, ie epoxy groups and hydroxyl groups, through chemical and thermal processes. The graphene is shaped in the carbon atom lattice, so the structure of the graphene oxide can be changed by heat treatment or chemical treatment.
The research team used a multilayer epitaxial graphene on a silicon carbide wafer in this study. This sample contains an average of 10 layers of graphene. Observations showed that after 35 days, the number of epoxy groups decreased and the number of hydroxyl groups increased slightly. Up to 3 months, the proportion of functional groups in both groups was basically balanced.
To resolve why such changes occur at room temperature, scientists have studied density-functional theory: Hydrogen and oxygen will generate water in functional groups, which will reduce the number of epoxy groups and slightly increase the number of hydroxyl groups. After experimental measurements and theoretical calculations, researchers have suggested that hydrogen may be involved. This conjecture was subsequently confirmed by the research team and the research team from the University of Texas at Dallas. The structure and chemical properties of the experimental sample will also evolve over a period of more than one month after the sample is made, which is the result of its continuous chemical reaction with hydrogen.
The researchers said that the role of hydrogen in determining the graphene oxide structure represents a new way to control the properties of graphene oxide materials. In the synthesis of materials, they may use hydrogen as a tool to change their structure. By adjusting the distribution and proportion of epoxy groups and hydroxyl groups, the material properties can be controlled.
Next, the research team will understand how to control the amount of hydrogen in the epitaxial oxide graphene and under what circumstances will affect the reaction of the two functional groups. Finally, they will obtain new graphite-based materials that are comparable to the original graphene electron transport properties. , And induce the electronic band gap and order structure in the material, in order to pave the way for the commercial application of nanoelectronic devices manufacturing. (Zhang Hao)
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