Open AccessA density functional theory study of absorption behavior of CO on Au-doped single-walled carbon nanotubes
Author(s) -
Jiandong Zhang,
Chun Cheng Yang,
Yuantao Chen,
Zhang Bian-Xia,
Shao Wen-Ying
Publication year - 2011
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.60.106102
Subject(s) - carbon nanotube , materials science , doping , density functional theory , absorption (acoustics) , adsorption , molecule , chemical physics , carbon fibers , nanotechnology , chemistry , computational chemistry , composite material , organic chemistry , optoelectronics , composite number
The absorption behaviors of CO on the (8,0) semiconducting intrinsic and gold doped (Au-doped) single-walled carbon nanotubes (SWCNTs) are investigated by the density functional theory because superior sensitivity of carbon nanotube to many toxic gases becomes a field of growing interest. It is shown that CO molecules can be absorbed to Au atoms on the wall of Au-doped SWCNT with a bingding energy as high as 2.1eV,and can attract lager charge transfer 0.23. Compared with the intrinsic SWCNT, the Au-doped SWCNT presents a high sensitivity to CO in terms of the calculated geometrical structures and electronic properties, Furthermore, the calculated electron densities of two representative adsorption positions show that Au-doped SWCNT electron clouds overlap more on the top of carbon adsorbed CO. By comparison with the oxygen absorption on SWCNT, we infer that the molecular CO absorbed on Au-doped SWCNT can induce significant change in the conductivity of SWCNT. So Au-doped SWCNT is expected to be a potential candidate for detecting the presence of CO.