Preparation of SWNT single crystals by using crystallization from dilute solution and its application to the high-performance material

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In this study, we crystallized the single-walled carbon nanotube (SWNT) from dilute solution. The crystal growth model of SWNT was proposed by transmission electronmicroscopy (TEM) observation. Electron diffraction spots of SWNT crystals were observed more clearly than that of SWNT bundles. Morphology of SWNT crystal can be controlled by crystallization condition.Water-dispersible SWNT have been prepared by ultrasonication in H2SO4/HNO3 mixture. SWNT nanofiller have been prepared by crystallization. Poly (vinyl alcohol) (PVA)/SWNT nanofiller composite films were prepared. Dispersion of SWNT nanofiller in the composite films were observed by transmission electron microscope. Significant improvement in the mechanical property was observed for these composite films.