Da Lei

Model calculation for enhancement factor of a gated field emission nanotube

The field enhancement factor of gated nanotube with opened top was analytically calculated by the electrostatic method. The effect of geometrical parameters of the device on their field enhancement factor was investigated, including the gate-hole radius, gate-anode distance, and nanotube radius. The theoretical analysis shows that the enhancement factor increases greatly with the decrease of gate-hole radius. However, if the gate voltage is zero, the factor increases with the increase of gate-hole radius, and finally reaches a constant, which increases with the increase of nanotube length L. The enhancement factor β gets larger when the nanotube radius gets smaller. As the gate-anode distance d2 is finite, the β will decrease with the increase of d2. If the d2 is infinite, the effect of gate-anode distance on β can be ignored. All the results of theoretical calculation can provide useful information in the fabrication and design of the gated nanotube cold cathode for field emission display panels and othe...

Calculation of electron emission from a gated single nanowire

The field-enhancement factor β on an individual nanowire with flattop was calculated analytically by the electrostatic method in a gated structure. To evaluate the influences of the geometrical parameters—including the gate-hole radius R, nanowire radius r0, nanowire length L, and gate-anode distance d2 for β—the authors proposed an ideal model of the gated single nanowire (L<d1), where d1 is the gate-cathode space. The calculation results showed that β decreases rapidly with both R and r0 and eventually saturates to a fixed value if R tends to infinity. It increases almost linearly with an increase in the nanowire height. When d2 is not much larger than d1 and R, β decreases slightly as d2 increases, but the effect of the gate-anode distance on β can be ignored if d2 is infinite. These results provide useful information on fabricating and designing gated nanowire cold cathodes for field-emission display panels and other nanoscale triodes.

Response to “Comment on ‘Model calculation for enhancement factor of a gated field emission nanotube’ ” [J. Appl. Phys. 104, 116103 (2008)]

The response addressed the comments of Roumeliotis and Xanthakis on our article [J. Appl. Phys. 102, 114503 (2007)]. The experimental results showed that the choice of the nanotube shape was true.

Field Emission Performances of Diamond Powders Coated with Metal

In this paper, the field emission performances from diamond powders coated with silver has been studied. Scanning electron microscopy, X-ray diffractometry, and Raman spectroscopy were employed in order to determine the morphology, crystal orientation and quality of diamond powder coated with silver

Electric field calculation of nanowire cold cathode device with a gate electrode

In this paper, the calculation of electric field of a nanowire in a triode cold cathode device by electrostatic theory is presented. The influences of some parameters on their field emission properties are explored in theory. An ideal model of nanowire triode cold cathode device are set up and applied in this study

Low threshold field electron emission of diamond films

Since CVD diamond film possesses desirable properties, it has been widely investigated, and much research has been made in this field. In this experiment, we mainly studied the characteristics of field emission from the CVD diamond films. The motivation for the experiment is to gain some insight into a possible emission mechanism. The diamond films are grown using a hot filament chemical vapor deposition, basing on the diamond micro-grits on silicon substrates. And the diamond micro-grits are deposited on silicon substrates using electrophoresis coat method, through a solution of diamond micro-grits in ethyl alcohol. This study has revealed that emission can be obtained at fields as low as 1.8V/μm. And the field emission measurements were carried out at a pressure of 10-4Pa.