Aligned Carbon Nanotube Films by Lyophilization
M.J. Kayatin, V.A. Davis
Auburn University, US
Keywords: carbon nanotube, aligned film, lyophilization
Abstract:We have developed a novel method for assembling aligned single-walled carbon nanotube (SWNT) films from aqueous dispersions of oxidized SWNTs via lyophilization. This process results in closely packed SWNTs with a high degree of horizontal alignment. The method is particularly attractive since unpurified carbon nanotubes can potentially be purified and assembled in one step using the acid oxidation route. In addition, this technique offers an alternative to assembly routes requiring the influence of high magnetic fields or flow alignment. Furthermore, evidence of crack-bridging in dried drop samples indicates that the inter-tube interaction may be robust. Potential film applications include layered nanocomposites and electronic components, specifically those where anisotropic property enhancement is desired. In addition, the resultant carboxylic acid functional groups on the oxidized SWNT films provide a plethora of possibilities for further functionalization routes.