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Published April 19, 1999 | Published
Journal Article Open

Hydrogen adsorption and cohesive energy of single-walled carbon nanotubes


Hydrogen adsorption on crystalline ropes of carbon single-walled nanotubes (SWNT) was found to exceed 8 wt.%, which is the highest capacity of any carbon material. Hydrogen is first adsorbed on the outer surfaces of the crystalline ropes. At pressures higher than about 40 bar at 80 K, however, a phase transition occurs where there is a separation of the individual SWNTs, and hydrogen is physisorbed on their exposed surfaces. The pressure of this phase transition provides a tube-tube cohesive energy for much of the material of 5 meV/C atom. This small cohesive energy is affected strongly by the quality of crystalline order in the ropes.

Additional Information

© 1999 American Institute of Physics. Received 11 January 1999; accepted 24 February 1999. The work at Caltech was supported by DOE through Basic Energy Sciences Grant DE-FG03-94ER14493. The work at Rice University was supported by NASA-JPL Contract No. 961204.

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