Carbon nanotube functionalization with carboxylic derivatives: a DFT study.
J Mol Model 2012;
19:391-6. [PMID:
22936348 DOI:
10.1007/s00894-012-1569-y]
[Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Accepted: 08/14/2012] [Indexed: 10/28/2022]
Abstract
Chemical functionalization of a single-walled carbon nanotube (CNT) with different carboxylic derivatives including -COOX (X=H, CH3, CH2NH2, CH3Ph, CH2NO2, and CH2CN) has been theoretically investigated in terms of geometric, energetic, and electronic properties. Reaction energies have been calculated to be in the range of -0.23 to -7.07 eV. The results reveal that the reaction energy is increased by increasing the electron withdrawing character of the functional groups so that the relative magnitude order is -CH2NO2>-CH2CN>-H>-CH2Ph>-CH3>-CH2NH2. The chemical functionalization leads to an increase in HOMO/LUMO energy gap of CNT by about 0.32 to 0.35 eV (except for -H). LUMO, HOMO, and Fermi level of the CNT are shifted to lower energies especially in the case of -CH2NO2 and -CH2CN functional groups. Therefore, it leads to an increment in work function of the tube, impeding the field electron emission.
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