کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1865642 | 1037853 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Density functional theory study of the electronic and field emission properties of nitrogen- and boron-doped carbon nanocones Density functional theory study of the electronic and field emission properties of nitrogen- and boron-doped carbon nanocones](/preview/png/1865642.png)
Using first-principles density functional theory, we have investigated the electronic and field emission properties of carbon nanocones (CNCs) doped with N or B with 60° disclination. Our findings are that the emission properties for the doped CNCs depend on the doping species, position, and concentration. Compared to pristine CNC, N-doped CNCs exhibit better field emission properties, in which as the doping concentration increases from 1.25% to 2.5% the maximum emission current at applied electric field of 0.3 V/Å increases from 0.94 μA (one N atom is doped at the position adjacent to the pentagon) to 2.90 μA (two N atoms are doped at pentagon). As for pristine CNC the emission current is only 0.21 μA. However, B-doping has no significant influence on the emission properties of CNCs. Our findings suggest that N-doped CNCs can be used as a candidate for cold-emission electron sources.
Journal: Physics Letters A - Volume 374, Issue 5, 18 January 2010, Pages 782–787