Author/Authors :
Nemeth، نويسنده , , Katalin and Jakab، نويسنده , , Emma and Borondics، نويسنده , , Ferenc and Tَhلti، نويسنده , , Hajnalka M. and Pekker، نويسنده , , ءron and Bokor، نويسنده , , Mَnika and Verebélyi، نويسنده , , Tamلs and Tompa، نويسنده , , Kلlmلn and Pekker، نويسنده , , Sلndor and Kamarلs، نويسنده , , Katalin، نويسنده ,
Abstract :
Reductive hydrogenation was applied to two types of single-walled carbon nanotubes with different diameter range. Alkali metal intercalation, followed by reaction with methanol, led to hydrogenated products. Both yield and selectivity of this reaction showed strong dependence on diameter, contrary to expectation based on simple curvature effects. The observed yield, as detected by thermogravimetry–mass spectrometry and 1H NMR, is drastically reduced in small-diameter tubes where the alkali dopant does not reach the inside of the bundles. Wide range optical transmission measurements were employed to determine the selectivity and indicate that besides higher yield, lower diameter selectivity occurs above a critical diameter.
