Using an ultra-high vacuum kinetics technique, we present unexpected experimental evidence that thick layers of carbon nanotubes (CNTs) show adsorption behavior that is kinetically distinct to that of thinner CNT films. Thick layers reveal much greater desorption temperatures (binding energies) for n-pentane and benzene compared to thinner CNT films. These results are significant in gaining an understanding of the interplay of kinetics and electronic effects as well as for applications in catalysis.
Bibliographical noteFunding Information:
We acknowledge assistance of J. Goering (NDSU) with the initial stages of the project as well as discussions with D. Neu (St Cloud State University). Financial support from the Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy is acknowledged by NDSU. The SEM characterization at the Center for Nanoscale Materials (Argonne) was financially supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.