| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Single-walled carbon nanotubes (SWCNTs) show various electrical properties, depending on their chiral structure. Therefore, chirality control of SWCNTs should be necessary for their application. In this study, we investigated magnetic field effects on structures of SWCNTs at various synthetic conditions, using the chemical vapor deposition and liquid decomposition methods under a superconducting magnet. Diameters, chiral indexes, and crystallinity of SWCNTs prepared by CVD and LD methods of ethanol at 1073 K were examined with Raman spectroscopy. Over 4 T magnetic field effects were detected; i.e., appearance of the 230 cm-1 Raman band. Diameter of SWCNTs prepared at 10 T tended to decrease and metallic SWCNTs grew more preferentially than semiconducting one. The distributions of diameter and crystallinity of SWCNTs were narrowed by magnetic fields. Using a small amount of catalyst or poor condition for growth of SWCNTs such magnetic field effects on SWCNTs were enhanced very much.
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