大学化学 >> 2024, Vol. 39 >> Issue (1): 364-368.doi: 10.3866/PKU.DXHX202307033

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石墨烯与六方氮化硼导电性差异的理论研究

李晓艳, 刘晴, 钟雨芙, 罗培研, 曾艳丽()   

  • 收稿日期:2023-07-12 录用日期:2023-08-31 发布日期:2023-10-09
  • 通讯作者: 曾艳丽 E-mail:yanlizeng@hebtu.edu.cn
  • 基金资助:
    国家级一流本科课程“结构化学”建设项目(2020年度);河北省高等教育教学改革研究与实践项目(2022GJJG139);国家自然科学基金(21973027)

Theoretical Study on the Conductivity Differences between Graphene and Hexagonal Boron Nitride

Xiaoyan Li, Qing Liu, Yufu Zhong, Peiyan Luo, Yanli Zeng()   

  • Received:2023-07-12 Accepted:2023-08-31 Published:2023-10-09
  • Contact: Yanli Zeng E-mail:yanlizeng@hebtu.edu.cn

摘要:

石墨烯和六方氮化硼(h-BN)属于等电子体。二者具有类似的结构,但导电性能截然不同。石墨烯具有良好的导电性能,但h-BN是电绝缘体。本文基于量子化学计算,通过自然键轨道分析、电子密度拓扑分析、核独立化学位移(NICS)和磁感应电流密度(AICD)等方法对模型分子C24H12及B12N12H12的电子结构进行了分析,对石墨烯和h-BN导电性差异进行了理论解释。研究结果有助于加深学生对等电子体、定域、离域π键等基本概念的理解。

关键词: 石墨烯, 六方氮化硼, 导电性

Abstract:

Graphene and hexagonal boron nitride (h-BN) are isoelectronic materials. Depite their similar structures, they exhibit stark differences in electrical conductivities. Graphene is an excellent conductivity, while h-BN is an insulator. Based on the quantum chemistry calculations, the electronic structures of model molecules, C24H12 and B12N12H12, have been studied by the topological analysis of electron density, natural bond orbital analysis, nucleus-independent chemical shift, and magnetic induced current density analysis. The study provides theoretical explanations for the conductivity differences between graphene and h-BN. These findings can enhance students' understanding of the fundametal concepts such as isoelectronic species, localization and delocalized π bond.

Key words: Graphene, Hexagonal boron nitride, Electrical conductivity