Experimental probes of the molecular hydrogen-carbon nanotube interaction

Bhabendra K. Pradhan, Gamini U. Sumanasekera, Kofi W. Adu, Hugo E. Romero, Keith A. Williams, Peter C. Eklund

Research output: Contribution to journalConference articlepeer-review

73 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)115-121
Number of pages7
JournalPhysica B: Condensed Matter
Volume323
Issue number1-4
DOIs
StatePublished - Oct 2002
EventProceedings of the Tsukuba Symposium on Carbon Nanotube in Com (CNT10) - Tsukuba, Japan
Duration: Oct 3 2001Oct 5 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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