中国物理B ›› 2020, Vol. 29 ›› Issue (10): 108102-.doi: 10.1088/1674-1056/abad1c

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Tong Liu(刘童)1, Xi-Gui Yang(杨西贵)1,†(), Zhen Li(李振)1, Yan-Wei Hu(胡宴伟)1, Chao-Fan Lv(吕超凡)1, Wen-Bo Zhao(赵文博)1, Jin-Hao Zang(臧金浩)1,‡(), Chong-Xin Shan(单崇新)1,§   

  • 收稿日期:2020-07-25 修回日期:2020-08-03 接受日期:2020-08-07 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: Xi-Gui Yang(杨西贵), Jin-Hao Zang(臧金浩), Chong-Xin Shan(单崇新)

Two-step high-pressure high-temperature synthesis of nanodiamonds from naphthalene

Tong Liu(刘童), Xi-Gui Yang(杨西贵)†, Zhen Li(李振), Yan-Wei Hu(胡宴伟), Chao-Fan Lv(吕超凡), Wen-Bo Zhao(赵文博), Jin-Hao Zang(臧金浩)‡, and Chong-Xin Shan(单崇新)§   

  1. 1 Henan Key Laboratory of Diamond Optoelectronic Materials and Devices, Key Laboratory of Materials Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
  • Received:2020-07-25 Revised:2020-08-03 Accepted:2020-08-07 Online:2020-10-05 Published:2020-10-05
  • Contact: Corresponding author. E-mail: yangxg@zzu.edu.cn Corresponding author. E-mail: jinhao_zang@zzu.edu.cn §Corresponding author. E-mail: cxshan@zzu.edu.cn
  • About author:
    †Corresponding author. E-mail: yangxg@zzu.edu.cn
    ‡Corresponding author. E-mail: jinhao_zang@zzu.edu.cn
    §Corresponding author. E-mail: cxshan@zzu.edu.cn
    * Project supported by the National Key R&D Program of China (Grant No. 2018YFB0406500), the National Natural Science Foundation of China (Grant Nos. U1804155, U1604263, and 11804307), and the China Postdoctoral Science Foundation (Grant Nos. 2018M630830 and 2019T120631).

Abstract:

Nanodiamonds have outstanding mechanical properties, chemical inertness, and biocompatibility, which give them potential in various applications. Current methods for preparing nanodiamonds often lead to products with impurities and uneven morphologies. We report a two-step high-pressure high-temperature (HPHT) method to synthesize nanodiamonds using naphthalene as the precursor without metal catalysts. The grain size of the diamonds decreases with increasing carbonization time (at constant pressure and temperature of 11.5 GPa and 700 °C, respectively). This is discussed in terms of the different crystallinities of the carbon intermediates. The probability of secondary anvil cracking during the HPHT process is also reduced. These results indicate that the two-step method is efficient for synthesizing nanodiamonds, and that it is applicable to other organic precursors.

Key words: nanodiamonds, high pressure high temperature, phase transition, naphthalene

中图分类号:  (Diamond)

  • 81.05.ug
62.50.-p (High-pressure effects in solids and liquids) 64.70.Nd (Structural transitions in nanoscale materials) 07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells)