The Field Emission Characteristics of Titanium-Doped Nano-Diamonds

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/cm 2 . 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.

Recent Progress of Nanodiamond Film in Controllable Fabrication and Field Emission Properties

“…It was found that the electronic gap state provided by the added N is beneficial to enhance the electron field emission at the surface of ND films [ 83 ]. Many attempts/changes were conducted for improving the field emission properties, such as adjusting the grain size and boundary, the concentration of sp 2 phase, and doping type/level [ 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 ].…”

“…Additionally, metal is another comment doping material to improve the field emission properties of ND film, which can not only effectively lower the residual stress and modify the carbon films’ mechanical property, but also simultaneously improve the capability of emitting electrons. Yang Y. et al proposed a titanium (Ti)-doped ND coating using electrophoresis and annealing (EPD @annealing) process, and studied the influence of Ti doping amount on the morphology, structure, and the field emission properties [ 92 ]. As exhibited in Figure 9 a, as the amount of Ti powder increases, the irregular grain arrays are formed and increased.…”

“… SEM images ( a ), field emission curves ( b ), microstructure model ( c ) and luminous photos ( d ) of the Ti-doped ND cathode film with different amounts of Ti powder, i.e., 0 mg, 2 mg, 5 mg, and 10 mg [ 92 ]. …”

Synthesis of N-type semiconductor diamonds with sulfur, boron co-doping in FeNiMnCo-C system at high pressure and high temperature

“…[1][2][3][4][5][6][7][8][9] Effective doping can modify some of these properties. [10][11][12][13][14] Attempts have been made to dope diamond films using various elements. Phosphorus, sulfur, and boron are considered as potential doping elements.…”

A comparison of the field emission characteristics of vertically aligned graphene sheets grown on different SiC substrates

“…Therefore, cold cathode electron field emitters are desirable for FE displays and other vacuum microelectronic devices. [2] Since the first study of the field emission (FE) of carbon nanotubes (CNTs) in 1995 by W. A. de Heer and coworkers, [3] the FE of carbon materials such as amorphous carbon, [4] diamond, [5][6][7] carbon nanofibers, [8] graphite, [9] and carbon films [10] has gained considerable interest and been intensively investigated. Among these, CNTs [11,12] have shown excellent FE properties owing to their large aspect ratio, excellent electrical conductivity, high thermal conductivity, and good mechanical properties.…”