Graphite nanofibers and multi-wall carbon nanotubes were mass-analyzed using

scanning atom probes. Various clusters of carbon and hydrogen were detected from

nanotubes. These were mostly H+, H2

+, C+, CH3

+ and C2H5

+. A few cluster ions

were detected in the mass range of 100 to 300. The largest mass peak was C28H4

+

with two satellite mass peaks. The abundance of the satellites agreed well with the

expected abundance of 12C27

13CH4 and 12C26

13C2H4, 28% and 4%, respectively. No

H+ mass peak was found for nanofibers but a significant number of ions such as

C2H5

+, C3H7

+ and C4H9

+ were detected. These ions were detected at the beginning

of the mass analysis. After removal of the surface layer, the detection rate of the

largest cluster, C23H2, increased. The proposed structure of the C28H4 cluster was a

rectangle formed of three rows by three rows of hexagonal cells, and that of C23H2

was of triangularly arranged six hexagonal cells. Four carbon atoms of C28H4 and

two carbon atoms of C23H2 clusters were terminated by hydrogen.

Scanning Atom Probe Study of Carbon Nanotubes and Graphite Nanofibers with

Hydrogen Terminated Defects. O.Nishikawa, M.Taniguchi, M.Ushirozawa: Journal

of Physics - Conference Series, 2008, 100[5], 052084