中国物理B ›› 2025, Vol. 34 ›› Issue (5): 58101-058101.doi: 10.1088/1674-1056/adb688

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Synthesis of two-dimensional diamond by phase transition from graphene at atmospheric pressure

Songyang Li(李松洋)1,2,3,4, Zhiguang Zhu(朱志光)1,2,3,4, Youzhi Zhang(张有志)1,2,3,4, Chengke Chen(陈成克)1,2,3,4, and Xiaojun Hu(胡晓君)1,2,3,4,†   

  1. 1 College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
    2 Moganshan Diamond Research Center, Huzhou 313200, China;
    3 Diamond Joint Research Center for Zhejiang University of Technology and Tanghe Scientific & Technology Company, Huzhou 313200, China;
    4 Moganshan Institute Zhejiang University of Technology, Huzhou 313200, China
  • 收稿日期:2024-12-07 修回日期:2025-02-08 接受日期:2025-02-17 发布日期:2025-04-24
  • 通讯作者: Xiaojun Hu E-mail:huxj@zjut.edu.cn
  • 基金资助:
    Project supported by the Key Project of the National Natural Science Foundation of China (Grant No. U1809210), the International Science Technology Cooperation Program of China (Grant No. 2014DFR51160), the One Belt and One Road International Cooperation Project from the Key Research and Development Program of Zhejiang Province, China (Grant No. 2018C04021), the National Natural Science Foundation of China (Grant Nos. 50972129, 50602039, and 52102052), the Fund from Institute of Wenzhou, Zhejiang University (Grant Nos. XMGL-CX-202305 and XMGLKJZX- 202307), and the Project from Tanghe Scientific & Technology Company (Grant No. KYY-HX-20230024).

Synthesis of two-dimensional diamond by phase transition from graphene at atmospheric pressure

Songyang Li(李松洋)1,2,3,4, Zhiguang Zhu(朱志光)1,2,3,4, Youzhi Zhang(张有志)1,2,3,4, Chengke Chen(陈成克)1,2,3,4, and Xiaojun Hu(胡晓君)1,2,3,4,†   

  1. 1 College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
    2 Moganshan Diamond Research Center, Huzhou 313200, China;
    3 Diamond Joint Research Center for Zhejiang University of Technology and Tanghe Scientific & Technology Company, Huzhou 313200, China;
    4 Moganshan Institute Zhejiang University of Technology, Huzhou 313200, China
  • Received:2024-12-07 Revised:2025-02-08 Accepted:2025-02-17 Published:2025-04-24
  • Contact: Xiaojun Hu E-mail:huxj@zjut.edu.cn
  • Supported by:
    Project supported by the Key Project of the National Natural Science Foundation of China (Grant No. U1809210), the International Science Technology Cooperation Program of China (Grant No. 2014DFR51160), the One Belt and One Road International Cooperation Project from the Key Research and Development Program of Zhejiang Province, China (Grant No. 2018C04021), the National Natural Science Foundation of China (Grant Nos. 50972129, 50602039, and 52102052), the Fund from Institute of Wenzhou, Zhejiang University (Grant Nos. XMGL-CX-202305 and XMGLKJZX- 202307), and the Project from Tanghe Scientific & Technology Company (Grant No. KYY-HX-20230024).

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摘要： It is a key challenge to prepare two-dimensional diamond (2D-diamond). Herein, we develop a method for synthesizing 2D-diamond by depositing monodisperse tantalum (Ta) atoms onto graphene substrates using a hot-filament chemical vapor deposition setup, followed by annealing treatment under different temperatures at ambient pressure. The results indicate that when the annealing temperature increases from 700 $^\circ$C to 1000 $^\circ$C, the size of the 2D-diamond found in the samples gradually increases from close to 20 nm to around 30 nm. Meanwhile, the size and number of amorphous carbon spheres and Ta-containing compounds between the graphene layers gradually increase. As the annealing temperature continues to rise to 1100 $^\circ$C, a significant aggregation of Ta-containing compounds is observed in the samples, with no diamond structure detected. This further confirms that monodisperse Ta atoms play a key role in graphene phase transition into 2D-diamond. This study provides a novel method for the ambient-pressure phase transition of graphene into 2D-diamond.

关键词: graphene, two-dimensional diamond, vacuum annealing, phase transition

Abstract: It is a key challenge to prepare two-dimensional diamond (2D-diamond). Herein, we develop a method for synthesizing 2D-diamond by depositing monodisperse tantalum (Ta) atoms onto graphene substrates using a hot-filament chemical vapor deposition setup, followed by annealing treatment under different temperatures at ambient pressure. The results indicate that when the annealing temperature increases from 700 $^\circ$C to 1000 $^\circ$C, the size of the 2D-diamond found in the samples gradually increases from close to 20 nm to around 30 nm. Meanwhile, the size and number of amorphous carbon spheres and Ta-containing compounds between the graphene layers gradually increase. As the annealing temperature continues to rise to 1100 $^\circ$C, a significant aggregation of Ta-containing compounds is observed in the samples, with no diamond structure detected. This further confirms that monodisperse Ta atoms play a key role in graphene phase transition into 2D-diamond. This study provides a novel method for the ambient-pressure phase transition of graphene into 2D-diamond.

Key words: graphene, two-dimensional diamond, vacuum annealing, phase transition

中图分类号:  (Diamond)

  • 81.05.ug
81.15.Gh (Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)) 81.16.-c (Methods of micro- and nanofabrication and processing) 83.10.Tv (Structural and phase changes)