| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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The Field Emission Characteristics of Titanium-Doped Nano-Diamonds |
| YANG Yan-Ning1, ZHANG Zhi-Yong2**, ZHANG Fu-Chun1, DONG Jun-Tang1, ZHAO Wu2, ZHAI Chun-Xue2, ZHANG Wei-Hu1 |
1College of Physics and Electronic Information, Yan'an University, Yan'an 716000
2School of Information Science and Technology, Northwest University, Xi'an 710127
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| Cite this article: |
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YANG Yan-Ning, ZHANG Zhi-Yong, ZHANG Fu-Chun et al 2012 Chin. Phys. Lett. 29 018103 |
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Abstract An electrophoresis solution, prepared in a specific ratio of titanium (Ti)-doped nano-diamond, is dispersed by ultrasound and the nano-diamond coating is then deposited on a polished Ti substrate by electrophoresis. After high-temperature vacuum annealing, the appearance of the surface and the microstructures of the coating are observed by a metallomicroscope, scanning electron microscopy and Raman spectroscopy. The field emission characteristics and luminescence features are also tested, and the mechanism of the field emission characteristics of the Ti-doped nano-diamond is analyzed. The experimental results show that under the same conditions, the diamond-coated surface (by deposition) is more uniform after doping with 5 mg of Ti powder. Compared with the undoped nano-diamond cathode, the turn-on fields decline from 6.95 to 5.95 V/µm. When the electric field strength is 13.80 V/µm, the field emission current density increases to 130.00 µA/cm2. Under the applied fields, the emission current is stable and the luminescence is at its best, while the field emission characteristics of the 10 mg Ti-doped coating become worse, as does the luminescence. The reason for this could be that an excessive amount of TiC is generated on the surface of the coating.
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| Keywords:
81.07.Bc
81.05.Ug
79.70.+q
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Received: 25 August 2011
Published: 07 February 2012
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| PACS: |
81.07.Bc
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(Nanocrystalline materials)
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81.05.ug
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(Diamond)
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79.70.+q
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(Field emission, ionization, evaporation, and desorption)
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