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Theoretical study of oxygen adsorption on graphite and the (8,0) single-walled carbon nanotube

Sorescu, DC and Jordan, KD and Avouris, P (2001) Theoretical study of oxygen adsorption on graphite and the (8,0) single-walled carbon nanotube. Journal of Physical Chemistry B, 105 (45). 11227 - 11232. ISSN 1089-5647

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Spin-polarized density functional calculations are used to study the adsorption of O atoms and O2 molecules on graphite and on a (8,0) single-walled carbon nanotube. An O atom is found to bind to graphite and to the outside and inside surfaces of the nanotube to give stable epoxide-like structures. Of these, the most stable is the epoxide on the outer surface of the nanotube, with a calculated adsorption energy of 44 kcal/mol. In the case of O2, both physisorbed and chemisorbed species are identified. The O2 molecule is predicted to only weakly physisorb (adsorption energy ≈ 0.9 kcal/mol) to the graphite and the (8,0) nanotube surfaces. However, these adsorption energies are expected to be underestimated due to inadequate treatment of the dispersion interactions. The chemisorbed species are metastable in the sense that they lie energetically above the isolated X 3∑g+ O2 and graphite or nanotube systems. In the case of the outer wall of the nanotube, the chemisorbed species is predicted to lie only 10.2 kcal/mol above the reactants. The reaction of O2 with the nanotube surface to give two epoxide groups is predicted to be slightly exothermic.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Sorescu, DCdsorescu@pitt.eduDSORESCU
Jordan, KDjordan@pitt.eduJORDAN
Avouris, P
Centers: Other Centers, Institutes, Offices, or Units > Center for Molecular and Materials Simulations
Date: 15 November 2001
Date Type: Publication
Journal or Publication Title: Journal of Physical Chemistry B
Volume: 105
Number: 45
Page Range: 11227 - 11232
DOI or Unique Handle: 10.1021/jp0122979
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 1089-5647
Date Deposited: 12 Nov 2012 15:12
Last Modified: 08 Jun 2022 19:55


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