AFM images of (a) as-oxidized MWCNT, (b) the MWCNT incubated with EDC and then with GroEL molecules, and (c) the MWCNT after rinsing with pure water. The thick arrow in (c) indicates a protein bonded to the open-ended tip of the sharpened MWCNT.
TEM image after attachment of the Qdot-streptavidin conjugates onto the open-ended MWCNTs.
(Color online) Ab initio calculation for (a) the distance, , dependence of the difference of the total energy difference, , between the optimized structure and the structure at , and for (b) the dependence of the bonding force of the covalent bond. The inset in (a) depicts a model for the covalent bonds between a CNT and a protein via a carboxyl base, where is defined as the distance between the C atom of and the N atom of . Thick arrows indicate the stretching direction. Isosurfaces of the total electron density of the bonding for each state and color mapping of the molecular electrostatic potential are also shown.
Comparison of the ratio of the Qdot attachment for control experiments.
Bonding energies for each bond and their contribution to the bonding.
Bonding energies for each bonding and their contribution to the bonding. (i)–(iv) correspond to (i)–(iv) in Table I.
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