Amino acid adsorption on single-walled carbon nanotubes |
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| Authors: | T Roman W A Diño H Nakanishi H Kasai |
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| Institution: | (1) Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan;(2) Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan;(3) Physics Department, De La Salle University, Manila, 1004, Philippines |
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| Abstract: | We investigate and discuss the adsorption of a few amino acids on (3,3)
carbon nanotubes and on graphite sheets through calculations within density functional theory. Results show weak binding of
the biomolecules on both substrates, but through generally favourable adsorption pathways. Zwitterion adsorption through the
charged amine and carboxylate groups are bound stronger to the nanotube surface in comparison to their nonionic counterparts,
as well as on histidine, phenylalanine, and cysteine side chain groups fixed in specific orientations. Binding strengths on
graphite suggest dissimilar trends for amino acid interactions with increasing
nanotube diameter. |
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| Keywords: | 85 35 Kt Nanotube devices 81 05 Uw Carbon diamond graphite 31 15 Ar Ab initio calculations 87 14 Ee Proteins |
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