中国物理B ›› 2021, Vol. 30 ›› Issue (6): 68101-068101.doi: 10.1088/1674-1056/abda33

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Effect of metal nanoparticle doping concentration on surface morphology and field emission properties of nano-diamond films

Yao Wang(王垚)1, Sheng-Wang Yu(于盛旺)1, Yan-Peng Xue(薛彦鹏)2, Hong-Jun Hei(黑鸿君)1, Yan-Xia Wu(吴艳霞)1, and Yan-Yan Shen(申艳艳)1,†   

  1. 1 Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024, China;
    2 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
  • 收稿日期:2020-10-29 修回日期:2020-12-18 接受日期:2021-01-11 出版日期:2021-05-18 发布日期:2021-06-09
  • 通讯作者: Yan-Yan Shen E-mail:shenyanyan@tyut.edu.cn
  • 基金资助:
    Project supported by the Science and Technology Major Project of Shanxi Province, China (Grant No. 20181102013) and the Fund from the "1331 Project" Engineering Research Center of Shanxi Province, China (Grant No. PT201801).

Effect of metal nanoparticle doping concentration on surface morphology and field emission properties of nano-diamond films

Yao Wang(王垚)1, Sheng-Wang Yu(于盛旺)1, Yan-Peng Xue(薛彦鹏)2, Hong-Jun Hei(黑鸿君)1, Yan-Xia Wu(吴艳霞)1, and Yan-Yan Shen(申艳艳)1,†   

  1. 1 Institute of New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024, China;
    2 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2020-10-29 Revised:2020-12-18 Accepted:2021-01-11 Online:2021-05-18 Published:2021-06-09
  • Contact: Yan-Yan Shen E-mail:shenyanyan@tyut.edu.cn
  • Supported by:
    Project supported by the Science and Technology Major Project of Shanxi Province, China (Grant No. 20181102013) and the Fund from the "1331 Project" Engineering Research Center of Shanxi Province, China (Grant No. PT201801).

摘要: Nano-diamond particles are co-deposited on Ti substrates with metal (Ti/Ni) nanoparticles (NPs) by the electrophoretic deposition (EPD) method combined with a furnace annealing at 800℃ under N2 atmosphere. Modifications of structural and electron field emission (EFE) properties of the metal-doped films are investigated with different metal NPs concentrations. Our results show that the surface characteristics and EFE performances of the samples are first enhanced and then reduced with metal NPs concentration increasing. Both the Ti-doped and Ni-doped nano-diamond composite films exhibit optimal EFE and microstructural performances when the doping quantity is 5 mg. Remarkably enhanced EFE properties with a low turn-on field of 1.38 V/μm and a high current density of 1.32 mA/cm2 at an applied field of 2.94 V/μm are achieved for Ni-doped nano-diamond films, and are superior to those for Ti-doped ones. The enhancement of the EFE properties for the Ti-doped films results from the formation of the TiC-network after annealing. However, the doping of electron-rich Ni NPs and formation of high conductive graphitic phase are considered to be the factor, which results in marvelous EFE properties for these Ni-doped nano-diamond films.

关键词: diamond films, metal doping, electrophoretic deposition, field emission properties

Abstract: Nano-diamond particles are co-deposited on Ti substrates with metal (Ti/Ni) nanoparticles (NPs) by the electrophoretic deposition (EPD) method combined with a furnace annealing at 800℃ under N2 atmosphere. Modifications of structural and electron field emission (EFE) properties of the metal-doped films are investigated with different metal NPs concentrations. Our results show that the surface characteristics and EFE performances of the samples are first enhanced and then reduced with metal NPs concentration increasing. Both the Ti-doped and Ni-doped nano-diamond composite films exhibit optimal EFE and microstructural performances when the doping quantity is 5 mg. Remarkably enhanced EFE properties with a low turn-on field of 1.38 V/μm and a high current density of 1.32 mA/cm2 at an applied field of 2.94 V/μm are achieved for Ni-doped nano-diamond films, and are superior to those for Ti-doped ones. The enhancement of the EFE properties for the Ti-doped films results from the formation of the TiC-network after annealing. However, the doping of electron-rich Ni NPs and formation of high conductive graphitic phase are considered to be the factor, which results in marvelous EFE properties for these Ni-doped nano-diamond films.

Key words: diamond films, metal doping, electrophoretic deposition, field emission properties

中图分类号:  (Diamond/nanocarbon composites)

  • 81.05.uj
85.45.Fd (Field emission displays (FEDs)) 81.07.Wx (Nanopowders)