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

在本研究中，我们从稀溶液中结晶了单壁碳纳米管(SWNT)。通过透射电子显微镜观察，提出了单壁碳纳米管的晶体生长模型。单壁碳纳米管晶体的电子衍射点比单壁碳纳米管束的电子衍射点更清晰。单壁碳纳米管的晶型可以通过控制结晶条件来控制，在H_2SO_4/HNO_3混合溶液中，超声作用下制备了水分散的单壁碳纳米管。采用晶化法制备了单壁碳纳米管。制备了聚乙烯醇(PVA)/单壁碳纳米管纳米填料复合膜。用透射电子显微镜观察了SWNT纳米粒子在复合膜中的分散情况。观察到这些复合膜的力学性能有了显著的提高。

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.