Single-walled carbon nanotubes in superacid: X-ray and calorimetric evidence for partly ordered H2SO4

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Zhou, Wei
Heiney, P. A
Fan, H.
Davis, Virginia A
Pasquali, M.
Smalley, Richard E
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Liquid anhydrous sulfuric acid forms a partly ordered structure in the presence of single-walled carbon nanotubes (SWNTs). X-ray scattering from aligned fibers immersed in acid shows the formation of molecular shells wrapped around SWNTs. Differential scanning calorimetry of SWNT-acid suspensions exhibits concentration-dependent supercooling/melting behavior, confirming that the partly ordered molecules are a new phase. We propose that charge transfer between nanotube π electrons and highly oxidizing superacid is responsible for the unique partly ordered structure.

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2005-07-01
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Copyright American Physical Society. Reprinted from Physical Review B, Volume 72, Issue 4, Article 045440, July 2005, 5 pages. Publisher URL: http://dx.doi.org/10.1103/PhysRevB.72.045440
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