Open AccessFEM study on the influence of oxygen on field emission of singlewalled carbon nanotubes
Author(s) -
Zhaoxiang Zhang,
Gengmin Zhang,
Shimin Hou,
Hao Zhang,
Zhennan Gu,
Weimin Liu,
Xingyu Zhao,
Zheng Xue
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.1282
Subject(s) - field electron emission , carbon nanotube , materials science , oxygen , work function , cathode , adsorption , analytical chemistry (journal) , field emission microscopy , limiting oxygen concentration , desorption , anode , nanotechnology , chemistry , optics , electrode , diffraction , physics , layer (electronics) , quantum mechanics , electron , organic chemistry , chromatography
Influence of oxygen on the field emission of singlewalled carbon nanotubes (SWCNTs) was studied using a fieldemission microscope (FEM) and a quadrupole mass spectrometer. After heat treatment at 1000℃, the field emission of clean SWCNTs occurred. Then oxygen was introduced into the vacuum system and the curves of field emission current versus anodecathode voltage (IV curves) were acquired after oxygen adsorption and desorption, respectively. We have observed that oxygen adsorption on SWCNTs leads to a decrease in field emission current, indicating an increase in the work function. Oxidation etching occurred when the SWCNTs were annealed at about 1000℃ under a pressure of 10-4Pa, and the corresponding changes were observed in both field emission images and IV curves.