Northeastern University materials science and engineering professor Qin Gaowu research team made important progress in the study of metal single atom composite materials. Its research results, "DielectricPolarization of Substitutional Single Niobium Atoms Defective in Gigahertz GraphiticLayers" has been published in the top physics journal Phys.Rev.Lett.

When the scale of the material is reduced to a single atomic scale, compared with ordinary nano materials, the surface atoms occupy rate of more than 90%, with extremely lively, unique physical and chemical properties and in the technical aspects of the potential of many applications. The team play more cross disciplinary advantage of materials, physics and chemistry, the independent design with high cooling capacity of DC arc plasma equipment. Accordingly, the synthesis of niobium metal graphite composite material with single atomic scale.

The first author of the study, Professor of materials science and engineering; Zhang Xuefeng with Oak Ridge National Laboratory units, using low voltage high resolution electron microscopy of the composite for nondestructive characterization, reveals the gas to the single atomic state form the physical nature of the process. The work is based on the experiment. Theoretical simulation assisted to further define the material microstructures and electromagnetic properties of the association, discovery of transition metal atom niobium - graphite composite unique GHz band dielectric polarization and dielectric loss properties for the first time in the world, also in theory predicted the phenomena may also exist in other transition metal doped carbon composite. This research has opened up a new direction for the design of high frequency dielectric loss material. It has a good application prospect in the field of integrated circuit to eliminate high frequency electromagnetic interference and military stealth weapons.

The achievements of the research, the Northeastern University in the PRL to the first author, the first unit published a paper Zero breakthrough.

• Prev：None;
• Next：Characteristics of composite materials for vehicle