Experimental probes of the molecular hydrogen-carbon nanotube interaction

被引：65

作者：

Pradhan, BK ^{[1
]}

Sumanasekera, GU ^{[1
]}

Adu, KW ^{[1
]}

Romero, HE ^{[1
]}

Williams, KA ^{[1
]}

Eklund, PC ^{[1
]}

机构：

[1] Penn State Univ, Dept Phys, Davey Lab 104, University Pk, PA 16802 USA

来源：

PHYSICA B-CONDENSED MATTER | 2002年 / 323卷 / 1-4期

关键词：

SWNTs; thermoelectric power; hydrogen storage;

D O I：

10.1016/S0921-4526(02)00994-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 H-2 physisorption under the experimental conditions investigated (4 K < T < 500 K; 0.1 atm < P < 20 atm). The response of S, R to 1 atm 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 1-2cm(-1) from their frequencies in the free molecule and indicates that two different adsorption sites can be detected. Finally, H-2 wt% storage in heavily processed ropes of SWNTs are found to exceed 6% at similar to1 atm and T = 77 K and the isosteric heat of adsorption is found to be 120 meV. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：115 / 121

页数：7

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