The isolation of single-wall carbon nanotube (SWNT) bundles and purification of these SWNTs were investigated by dispersing the SWNTs in an aqueous gelatin solution. TEM images of the SWNTs dispersed in the gelatin solution showed that the interaction between the gelatin molecules and the SWNTs produces a transformation of the SWNT bundles into thin bundles. Raman spectra measurements revealed that dispersing the SWNTs in the gelatin solution is a good purification procedure for the SWNTs.
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