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An inside space of the single-wall carbon nanotube (SWNT) can be used as a template for one-dimensional molecular crystals simply by filling the space with molecules. Here we show some results of the filling with fullerenes, organic molecules, and DNA. High-density filling was confirmed by X-ray diffraction analysis for the each sample. It was found that the relative intensity change in radial breathing modes in the Raman spectra from the SWNT, not from the molecules inside, can be used as a filling monitor similarly to the (10) peak intensity change in the X-ray diffraction. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Temperature dependence of photoconductivity has been investigated for single-wall carbon nanotube (SWNT) films at 0.7eV in the temperature range from 10 K to room temperature (R.T.). Although photoresponse monotonously increases with a decrease in temperature, the behavior depends on the sample. This sample dependence can be attributed to the variation of the transport properties of semiconducting-SWNT circuits. We also relate the potential of photoconductivity measurements for evaluating NTs-devices. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

To see the bundle effects on the electronic and the vibrational properties of single-wall carbon nanotubes (SWNTs), we have measured the resonance Raman scattering of isolated SWNTs and thick bundles. For the measurements of the isolated SWNTs, we used an evacuated sample after bromine doping. A broad and asymmetric tangential mode band, which is a sign of the resonance of the metallic SWNTs and can be fitted by a Fano line shape, is not observed in the isolated SWNTs. This suggests the inter-tube interactions play an important role to the Fano interference. On the other hand, the purified sample shows very thick acquired bundles. We observed 4% higher breathing mode frequencies than in the pristine sample. Further, in the case of multi-wall nanotubes, we observed 5% higher breathing mode frequencies than the SWNTs. These results can be explained by the interlayer interactions. [ABSTRACT FROM AUTHOR]