Modeling and calculation of field emission enhancement factor for carbon nanotubes array

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

“…The enhancement factor is very depended on the aspect ratio and shape of the nanowires tips as well as the interspace distances between the nanowires. The effects of these structural parameters on the induced local electric fields between the two parallel plates were studied by these authors and reported previously [22][23][24][25][26][27][28][29][30][31]. Devices were designed considering gold, silver, and semiconductor ZnO as the materials for the nanowires.…”

The role of tunneling barrier modification for the saturation current of carbon nanotube field emission in strong electric field

“…For a typical CNT the aspect ratio ranges from 10 3 to 10 5 . When anode cathode separation is much higher than the length of the CNT, the field enhancement factor (b) is almost equal to aspect ratio in addition with some constant factor [25][26][27]. In this Letter we have taken the field enhancement factor of the single CNT to a constant value b = 1000.…”

Analytical optimization for field emission of carbon nanotube array

“…Thus, at a tenth height of nanotubes, the FE from CNT array can be optimized analytically with the maximum emission current density and the 90% field enhancement factor. In our previous works [14][15][16][17] , the FE from a CNT array was optimized only depending on the field enhancement factor. Insuring the enhancement factor at the maximum, the optimization condition for the FE from CNT array can be estimated by decreasing the intertube distance as far as possible, but the detail value of the optimal intertube distance was uncertain.…”

“…The field enhancement factor represents the emission capability of electrons from the FE materials, while the emission current density determines the intensity of the electrons-emission. In our previous works [14][15][16] , the FE from a CNT array has been studied theoretically using a floating sphere model and image…”

“…The field enhancement factor represents the emission capability of electrons from the FE materials, while the emission current density determines the intensity of the electrons-emission. In our previous works [14][15][16] , the FE from a CNT array has been studied theoretically using a floating sphere model and image method, and proved that the intertube distance of the CNT array critically affected the field enhancement factor. The anode-cathode distance, the geometrical arrangement form and the CNT number of a CNT array also gave influence to the field enhancement factor to some extent.…”