1College of Physics and Electronic Information, Yan'an University, Yan'an 716000 2School of Information Science and Technology, Northwest University, Xi'an 710127
The Field Emission Characteristics of Titanium-Doped Nano-Diamonds
1College of Physics and Electronic Information, Yan'an University, Yan'an 716000 2School of Information Science and Technology, Northwest University, Xi'an 710127
摘要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.
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.
[1] Zhu W et al 1998 Science 282 1471
[2] Gu G Y and Toshimichi Ito 2011 Appl. Surf. Sci. 257 2455
[3] Roos M et al 2007 Appl. Surf. Sci. 253 7381
[4] Li Z L et al 2010 Chin. Phys. Lett. 27 0685047
[5] Kumar A et al 1997 Thin Solid Films 308 209
[6] Wang T et al 2009 Chin. Phys. Lett. 26 066801
[7] Pryor R W 1996 Appl. Phys. Lett. 68 1802
[8] Zang Y and Diao D S 2009 Chin. Phys. Lett. 26 038101
[9] Li J et al 2008 Chin. Phys. Lett. 25 2657
[10] Robertson 1996 Phys. Rev. B 53 16302
[11] Liao M Y et al 2002 J. Cryst. Growth 236 85
[12] Xue X Y et al 2007 Chin. Phys. Lett. 24 3492
[13] Lee Y C et al 2005 Diamond Relat. Mater. 14 2055
[14] Franz A M and Robert J 2006 Diamond Relat. Mater. 15 217
[15] Contreras O et al 2000 Appl. Surf. Sci. 58 236
[16] Baral B et al 1997 Diamond Relat. Mater. 6 867
[17] Li J J et al 2005 Appl. Phys. A 81 357
[18] Wang S G et al 2003 Surface and Coating Technology 167 143
[19] Shao L X et al 1999 J. Lanzhou University (Natural Sciences) 35 160
[20] GU C Z 2005 Appl. Surf. Sci. 251 225
[21] Palosz B et al 2006 Diam. Relat. Mater. 15 1813
[22] Kulisch W et al 2006 Thin Solid Films 515 1005
[23] Chen W C et al 2009 Diamond Relat. Mater. 8 124
[24] Chalker P R et al 1994 Diamond Relat. Mater. 3 393
[25] Yan J K and Chang L 2006 Thin Solid Films 498 230
[26] Pfeiffer R, Kuzmany H, Knoll P, Bokova S, Salk N and Gunther B 2003 Diamond Relat. Mater. 12 268
[27] Chen Q J, Wang L X, Zhang Z, Yang J and Lin Z D 1996 Appl. Phys. Lett. 68 176
[28] Prawer S et al 2000 Chem. Phys. Lett. 332 93
[29] Ferrari A C and Robertson J 2001 Phys. Rev. B 63 121405
[30] Filik J et al 2006 Phys. Rev. B 74 035423
[31] Xu N S et al 2001 J. Vac. Sci. Technol. B 19 105
[32] Qiao L et al 2009 Diamond Relat. Mater. 18 657
2012, Vol. 29 
