Enhanced field emission from nitrogen-doped amorphous diamond

Abstract

Undoped and nitrogen-doped amorphous diamond were deposited on n-type Si(100) substrate by a cathodic arc process. By varying nitrogen partial pressure of the gas mixture in the range of 0 to 55.6%, up to 23 at.% of nitrogen was incorporated in amorphous diamond. The electron spectroscopy for chemical analysis, Raman, and atomic force microscopy measurements indicated that most nitrogen atoms replaced carbon atoms in the amorphous structure. The electron concentration, mobility, and its resistivity were determined by the measurement of Hall effect. With the increasing of nitrogen content, the resistivity curve is U-shaped with a local minimum. The electron emission current in vacuum was characterized based on the diode design. It was found that the electron emission was highly reproducible. This is in contrast to the high variability observed for carbon nanotubes. The lowest resistivity coating had the lowest “turn-on” electrical field of 0.7 V/μxm at the current density of 10 μA/cm2.

Electrical and optical characteristics of hydrogen-plasma treated ZnO nanoneedles

“…In addition, the emission current density was significantly increased by plasma treatment. 23,24 Hence, we strongly suggest that the enhanced field emission characteristics of ZnO nanoneedles after hydrogen plasma treatment result from the increased carrier concentration due to hydrogen doping. The hydrogen doping effect was also investigated measuring low temperature ͑10 K͒ PL spectra of ZnO nanoneedle array before and after hydrogen-plasma treatment.…”

Improvement of field-emission-lamp characteristics using nitrogen-doped carbon nanocoils

“…Gaussian spectral decomposition (Gaussian fitting) revealed that the broadened spectrum can be decomposed into five constituents centered at 284.4 ± 0.3 eV, 285.4 ± 0.3 eV, 286.4 ± 0.3 eV, 288.1 ± 0.3 eV, and 289.5 ± 0.3 eV. Thus the carbon 1s peak measured by ESCA could contain C\C sp 2 , C\C sp 3 , C\N sp 2 , C\N sp 3 , and C\O bonds [52].…”