[show abstract][hide abstract] ABSTRACT: We present a rational and general method to fabricate a high-densely packed and aligned single-walled carbon-nanotube (SWNT) material by using the zipping effect of liquids to draw tubes together. This bulk carbon-nanotube material retains the intrinsic properties of individual SWNTs, such as high surface area, flexibility and electrical conductivity. By controlling the fabrication process, it is possible to fabricate a wide range of solids in numerous shapes and structures. This dense SWNT material is advantageous for numerous applications, and here we demonstrate its use as flexible heaters as well as supercapacitor electrodes for compact energy-storage devices.
Nature Material 11/2006; 5(12):987-994. · 35.75 Impact Factor
[show abstract][hide abstract] ABSTRACT: We present a new form of carbon nanotubes (CNT) material where CNTs are aligned and packed densely in a bulk solid. This single-walled carbon nanotube (SWNT) solid is fabricated from liquid-induced collapse of the sparse as-grown SWNT forest synthesized by super-growth CVD , which results in a 20x increase in mass density and a 70x increase in the Vickers hardness while retaining alignment and high surface area. As such, SWNT solid is an ideal form of CNTs for material and energy storage. The high surface area and well-defined microscopic structure imply that SWNT solid can be regarded as a conductive and flexible mesoporous material. In addition, we can engineer shapes suitable to the application. These unique characters make SWNT solid as a valuable material for supercapacitor electrodes and flexible heaters. Furthermore, we show how partial shrinking of the as-grown material creates a handle for robust mechanical and electrical connection to demonstrate exceptional tribological character and wear rate. The SWNT solid promises to open new frontiers in within the carbon nanotube field.  K. Hata et al, Science, 306, 1241 (2004).