Carbon nanotubes and fullerenes were synthesized by arc discharge in a He gas atmosphere under a high magnetic field up to 10 T. Morphology and the yield of these nanotubes were investigated by scanning electron microscopy and transmission electron microscopy (TEM). The yield and type of fullerenes were also evaluated by ultraviolet visual spectroscopy. TEM images revealed that thin collapsed nanotubes having larger curvature were synthesized under a high magnetic field, in particular at 10 T. Furthermore, the ratio of C70 to C60 concentration was found to vary depending on the magnitude of the magnetic field during arc discharge. Based on these results, the effects of magnetic field on the synthesis of carbon nanotubes and fullerenes are discussed.
Carbon nanotubes were synthesized by arc discharge in a CF4 gas atmosphere
involving fluorine atoms, which are able to terminate carbon bonding, while no fullerenes
were synthesized in a CF4 gas atmosphere. The morphology of these nanotubes was
investigated by scanning electron microscopy (SEM) and transmission electron
microscopy (TEM). Based on these results, the synthesized conditions in CF4 gas were
compared with those in other gases, i.e., in CH4, H2, He and Ar gases. In addition,
electron spin resonance (ESR) measurements were performed in order to obtain
information about the electronic properties of these nanotubes.
Introduction. Although boron-doped (B-doped) carbon nanotubes and boroncarbonnitrogen (B±C±N) nanotubes have been synthesized [1,2], there are not known investigations of the electronic properties of these nanotubes. In this brief report, we investigate the electronic properties of B-doped carbon nanotubes using electron spin resonance (ESR) and conductance measurements. The morphology of synthesized nanotubes is also investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
We consider tt * equations appearing in the study of localized tachyon condensations. They are described by various Toda system when we consider the condensation by the lowest tachyon corresponding to the monomial xy. The tachyon potential is calculated as a solution to these equations. The Toda system appearing in the deformation of C 2 /Z n by xy is identical to that of D n singularity deformed by x. For C 3 /Z n with xyz deformation, we find only generic non-simple form, similar to the case appearing in C/Z 5 → C/Z 3 and we discuss the difficulties in these cases.
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