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Behaviors of a single CO 2 molecule on a clean pentagon at a tip of multiwall carbon nanotube (MWNT) were investigated by field emission microscopy (FEM). A CO 2 admolecule was recognized as a gourd‐shaped bright spot in an FEM image similar to the nitrogen admolecule previously reported. The shape of bright spot reflected an adsorption state that the molecular axis was parallel to substrate pentagon. The CO 2 admolecule moved between five steady adsorption sites which were reflected in the geometrical five‐fold symmetry of pentagon. From these experimental results, we propose an adsorption site model for a CO 2 admolecule on a clean pentagon. By an Nd:YAG pulse laser irradiation, the CO 2 admolecule successfully desorbed without any damage of the substrate pentagon whereas the end‐atoms are oxygen. This suggests that a CO 2 molecule on a pentagon is physisorbed and chemically inert for surfaces of MWNT.
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Kishimoto et al. (2008) studied this question.
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