TY - JOUR
T1 - Experimental probes of the molecular hydrogen-carbon nanotube interaction
AU - Pradhan, Bhabendra K.
AU - Sumanasekera, Gamini U.
AU - Adu, Kofi W.
AU - Romero, Hugo E.
AU - Williams, Keith A.
AU - Eklund, Peter C.
N1 - Funding Information:
This work was supported by ONR, NSF (PSU MRSEC), Honda Motors. Many valuable discussions with Profs. Gerald Mahan, Milton Cole, and Vincent Crespi are gratefully acknowledged.
PY - 2002/10
Y1 - 2002/10
N2 - Electrical transport (resistance R and thermoelectric power S), Raman scattering, and hydrogen adsorption are used to study the interaction of hydrogen molecules with ropes of single-walled carbon nanotubes. The data are consistent with H2 physisorption under the experimental conditions investigated (4 K < T < 500 K; 0.1 atm < P < 20 atm). The response of S, R to 1atm hydrogen at 500 K is consistent with the introduction of a new scattering channel for electrons/holes in the metallic tubes. Raman scattering from the Q-branch of hydrogen molecules adsorbed on the surface is found shifted only by 1-2 cm-1 from their frequencies in the free molecule and indicates that two different adsorption sites can be detected. Finally, H2 wt% storage in heavily processed ropes of SWNTs are found to exceed 6% at ∼1 atm and T = 77 K and the isosteric heat of adsorption is found to be 120 meV.
AB - Electrical transport (resistance R and thermoelectric power S), Raman scattering, and hydrogen adsorption are used to study the interaction of hydrogen molecules with ropes of single-walled carbon nanotubes. The data are consistent with H2 physisorption under the experimental conditions investigated (4 K < T < 500 K; 0.1 atm < P < 20 atm). The response of S, R to 1atm hydrogen at 500 K is consistent with the introduction of a new scattering channel for electrons/holes in the metallic tubes. Raman scattering from the Q-branch of hydrogen molecules adsorbed on the surface is found shifted only by 1-2 cm-1 from their frequencies in the free molecule and indicates that two different adsorption sites can be detected. Finally, H2 wt% storage in heavily processed ropes of SWNTs are found to exceed 6% at ∼1 atm and T = 77 K and the isosteric heat of adsorption is found to be 120 meV.
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U2 - 10.1016/S0921-4526(02)00994-8
DO - 10.1016/S0921-4526(02)00994-8
M3 - Conference article
AN - SCOPUS:0036776619
SN - 0921-4526
VL - 323
SP - 115
EP - 121
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 1-4
T2 - Proceedings of the Tsukuba Symposium on Carbon Nanotube in Com (CNT10)
Y2 - 3 October 2001 through 5 October 2001
ER -