The reporter learned from Shanghai Jiaotong University that the latest research report on the grain boundary of two-dimensional nanomaterials was published by Professor Li Weifeng's research group, Nanoscale, in the latest international micro-nano research field. The mechanical and thermal properties and mechanism of grain boundaries in the in-plane hybrid structure of graphene and boron nitride are revealed.
Two-dimensional nano-materials have excellent physical and chemical properties that traditional materials cannot match, and their performance regulation is a hot topic of concern for materials and mechanics. The formation of planar heterostructures by in-plane splicing of different two-dimensional nanomaterials has proven to be an effective performance control method to meet the specific requirements for micro-nano device performance in practical applications.
Graphene and hexagonal boron nitride are two typical two-dimensional materials with a hexagonal structure. The lattice constants are close to each other, but there are significant differences in some properties, so it is a planar heterostructure that achieves performance control. Ideal component. For example, graphene is a good conductor with zero bandwidth, and hexagonal boron nitride has a significant bandwidth capability. By adjusting the composition ratio of graphene and hexagonal boron nitride in a planar carbon boron nitride heterostructure, the electrical properties of the overall material can be controlled. Attributes are of great significance for the design and manufacture of micro/nano circuit components. Theoretical studies have shown that in the planar heterostructure, the atomic structure of the carbon boron-nitrogen hybrid grain boundary exhibits a special asymmetric optimization arrangement, but its related properties have not been reported.
In an interview with the Science and Technology Daily reporter, Li Yufeng explained: “The grain boundary is similar to the clothes zipper. The two different orientation materials are spliced ​​together. The zipper is the weak link of the whole material, and its characteristics will determine the overall performance of the material.â€
Professor Wei Yujie, deputy director of the Institute of Mechanics of the Chinese Academy of Sciences and winner of the National Outstanding Youth Fund, commented: "The relationship between the grain boundary deflection angle and the mechanical properties of the heterogeneous interface revealed by this work and the asymmetry effect in the heat transfer process, It is of great significance to understand the influence of heterogeneous interfaces on the overall structural performance and its subsequent engineering applications, and provides a good idea for the analysis of similar structures."
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