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  • Received: Aug. 29, 2019

    Accepted: --

    Posted: Sep. 17, 2020

    Published Online: Sep. 17, 2020

    The Author Email: Lin Qi-Min (lqm@bupt.edu.cn), Cui Jian-Gong (jgcui@nuc.edu.cn)

    DOI: 10.7498/aps.68.20191304

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    Qi-Min Lin, Xia Zhang, Qi-Chao Lu, Yan-Bin Luo, Jian-Gong Cui, Xin Yan, Xiao-Min Ren, Xue Huang. First-principles study on structural stability of graphene oxide and catalytic activity of nitric acid[J]. Acta Physica Sinica, 2019, 68(24): 247302-1

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Acta Physica Sinica, Vol. 68, Issue 24, 247302-1 (2019)

First-principles study on structural stability of graphene oxide and catalytic activity of nitric acid

Lin Qi-Min1, Zhang Xia1,*, Lu Qi-Chao1, Luo Yan-Bin1, Cui Jian-Gong2,*, Yan Xin1, Ren Xiao-Min1, and Huang Xue3

Author Affiliations

  • 1State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 2State Key Laboratory of Dynamic Testing Technology, North University of China, Taiyuan 030051, China
  • 3Beijing Computing Center, Beijing 100094, China

Abstract

The stability and electronic structure properties of graphene fumigated by nitric acid are systematically studied by the first-principles method based on ultrasoft pseudopotentials. The model of graphene oxide fumigated by nitric acid is built based on the 2 × 2 supercell model with orthogonal graphene unit cells, which contains 15 carbon and 2 oxygen atoms. The results show that the fumigated graphene containing a carbon atom bonded to an oxygen atom is a stable structure with lower energy, which is consistent with the experimental result. In addition, the mechanical stability analysis shows ${ {C_{66}} > 0,\;{C_{11}} > 0,\;{C_{11}}{C_{22}} > C_{12}^2} $, which satisfies the mechanical stability condition. By analyzing the reactant and product, it can be concluded that the nitric acid acts as catalyst. Moreover, the process of graphene oxidation catalyzed by nitric acid is endothermic and the reaction needs heating. By analyzing the electronic properties of the structure, the graphene oxide is determined to be an intrinsic semiconductor with a direct band gap of 1.12 eV and work function of 5.28 eV. These results provide theoretical basis for preparing the graphene oxide and its applications in the field of optoelectronic devices.

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